webProeasy

Simple Web (d5c47306-5d4f-4ad4-958f-5414a0b85b9b)

hackerlab

Task: Flask web app with user input reflected in 404 page HTML comments. Solution: Exploited Jinja2 SSTI to achieve RCE, bypassed / filter using cd commands to read the flag.

flask rce filter_bypass ssti python server_side_template_injection jinja2 werkzeug

Server-Side Template Injection (SSTI) in Jinja2RCE via lipsum.__globals__["os"].popen()Filter bypass using cd commands instead of absolute paths

$ ls tags/ techniques/

flask rce filter_bypass ssti python server_side_template_injection jinja2 werkzeug

Server-Side Template Injection (SSTI) in Jinja2RCE via lipsum.__globals__["os"].popen()Filter bypass using cd commands instead of absolute paths

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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