DC5通关及溯源分析

一、信息收集

对靶机扫描发现，开放了80端口和111端口，其中111端口没啥特殊服务，真正的入口只有80端口，80端口用的是nginx 1.6.2。

对网站进行目录扫描，发现有个footer.php，推断可能文件包含的问题，有可能footer.php是通过参数传过去的。

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<?php
// 包含配置文件
require_once 'config.php';

// 包含模板文件
include 'header.php';
echo "这是主要内容";
include 'footer.php';
?>

同时，发现有个留言界面，注意到提交留言后，footer.php的年份不一样。文件包含有两个条件，一是有文件包含的代码，二是能够获取到传递的参数。因此，下一步的思路就是爆破隐藏的url参数。

二、URL隐藏参数爆破

我们开启好bp，使用一个arjun的工具，这个工具可以组合字典里的参数名，进行自动化的排定。在proxychains配置代理为bp，这样arjun爆破的流量也能被及时捕获。爆破发现，arjun无法自动给出参数，通过bp发现，有一组（250多个）参数的值返回参数是997，其他是1014，我们把这一组参数拷贝下来，准备下一轮筛选，看看究竟是哪个参数发挥作用。

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proxychains  arjun -u http://192.168.136.194/thankyou.php  -w /usr/share/wordlists/seclists/Discovery/Web-Content/burp-parameter-names.txt

为了找到这250多个参数，究竟是哪个参数有作用，我们可以使用bp爆破，但是bp爆破的速度实在太慢了，可以写个python脚本，按照bp的输出格式打印到一个csv文件。

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import requests
import csv
import time

# ====== 配置区 ======
BASE_URL = "http://192.168.136.194/thankyou.php"

# 必需的基础参数（来自原始请求）
BASE_PARAMS = {
    "firstname": "1",
    "lastname": "111",
    "country": "australia",
    "subject": "11"
}

# 完整请求头（从 Burp 复制）
HEADERS = {
    "Host": "192.168.136.194",
    "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:83.0) Gecko/20100101 Firefox/83.0",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
    "Accept-Language": "en-US,en;q=0.5",
    "Accept-Encoding": "gzip, deflate, br",
    "Connection": "keep-alive",
    "Upgrade-Insecure-Requests": "1"
}

DICT_FILE = "/tmp/1201.txt"   # 所有要测试的隐藏参数列表
BATCH_SIZE = 1            # 每次组合 10 个参数一起发
# ====================

# 读取所有候选参数
with open(DICT_FILE, "r") as f:
    all_test_params = [line.strip() for line in f if line.strip() and not line.startswith("#")]

print(f"[+] Loaded {len(all_test_params)} candidate parameters")
print(f"[+] Will test in batches of {BATCH_SIZE} parameters per request")

# CSV 输出
FIELDNAMES = ["Batch_Params", "URL", "Status code", "Length", "MIME type", "Time (ms)", "Response"]
with open("batch_results.csv", "w", newline="", encoding="utf-8") as f:
    writer = csv.DictWriter(f, fieldnames=FIELDNAMES)
    writer.writeheader()

    # 分批：每批 BATCH_SIZE 个参数
    for i in range(0, len(all_test_params), BATCH_SIZE):
        batch = all_test_params[i:i + BATCH_SIZE]
        print(f"\n[+] Sending request with params: {batch}")

        # 构造完整参数：基础参数 + 当前批次的 10 个隐藏参数
        payload = BASE_PARAMS.copy()
        for param in batch:
            payload[param] = "1"  # 所有测试参数值设为 "1"

        # 拼接 URL
        query_str = "&".join([f"{k}={v}" for k, v in payload.items()])
        url = BASE_URL + "?" + query_str

        start = time.time()
        try:
            resp = requests.get(
                url,
                headers=HEADERS,
                timeout=10,
                verify=False,
                allow_redirects=False
            )
            elapsed_ms = int((time.time() - start) * 1000)

            row = {
                "Batch_Params": ",".join(batch),
                "URL": url,
                "Status code": resp.status_code,
                "Length": len(resp.content),
                "MIME type": resp.headers.get("Content-Type", "unknown"),
                "Time (ms)": elapsed_ms,
                "Response": resp.text[:500].replace("\n", " ").replace("\r", " ")
            }
            writer.writerow(row)
            print(f"  → Status: {resp.status_code} | Length: {len(resp.content)}")

        except Exception as e:
            elapsed_ms = int((time.time() - start) * 1000)
            row = {
                "Batch_Params": ",".join(batch),
                "URL": url,
                "Status code": "ERROR",
                "Length": 0,
                "MIME type": "none",
                "Time (ms)": elapsed_ms,
                "Response": str(e)[:500]
            }
            writer.writerow(row)
            print(f"  → ERROR: {str(e)[:50]}")

print("\n✅ Done! Results saved to batch_results.csv")