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hacktricks/network-services-pentesting/3128-pentesting-squid.md
Carlos Polop 8073f5697c a
2024-02-09 13:24:06 +01:00

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Basic Information

From Wikipedia:

Squid is a caching and forwarding HTTP web proxy. It has a wide variety of uses, including speeding up a web server by caching repeated requests, caching web, DNS and other computer network lookups for a group of people sharing network resources, and aiding security by filtering traffic. Although primarily used for HTTP and FTP, Squid includes limited support for several other protocols including Internet Gopher, SSL, TLS and HTTPS. Squid does not support the SOCKS protocol, unlike Privoxy, with which Squid can be used in order to provide SOCKS support.

Default port: 3128

PORT     STATE  SERVICE      VERSION
3128/tcp open   http-proxy   Squid http proxy 4.11

Enumeration

Web Proxy

You can try to set this discovered service as proxy in your browser. However, if it's configured with HTTP authentication you will be prompted for usernames and password.

# Try to proxify curl
curl --proxy http://10.10.11.131:3128 http://10.10.11.131

Nmap proxified

You can also try to abuse the proxy to scan internal ports proxifying nmap.
Configure proxychains to use the squid proxy adding he following line at the end of the proxichains.conf file: http 10.10.10.10 3128

Then run nmap with proxychains to scan the host from local: proxychains nmap -sT -n -p- localhost

SPOSE Scanner

Alternatively, the Squid Pivoting Open Port Scanner (spose.py) can be used.

python spose.py --proxy http://10.10.11.131:3128 --target 10.10.11.131
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