webPromedium

Lab 182 — PagePilot — XSS via Cache Poisoning

hackadvisor

Task: An Express application behind nginx caches HTML containing a proxy-derived host and provides an admin review bot. Solution: Poison the unkeyed X-Forwarded-Host value with attribute-breakout XSS, report the cached page, and decode the exfiltrated flag cookie.

xss nginx express admin_bot web_cache_poisoning unkeyed_header

cookie_exfiltrationattribute_breakout_xsscache_key_analysisforwarded_host_poisoning

$ ls tags/ techniques/

xss nginx express admin_bot web_cache_poisoning unkeyed_header

cookie_exfiltrationattribute_breakout_xsscache_key_analysisforwarded_host_poisoning

Analysis

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

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