Pound: HTTP request smuggling

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200606-05 / pound
Release Date	June 07, 2006
Latest Revision	November 24, 2006: 03
Impact	low
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-servers/pound	< 2.0.5	>= 2.0.5, revision >= 1.10, revision >= 1.9.4	All supported architectures

Related bugreports: #118541

Synopsis

Pound is vulnerable to HTTP request smuggling, which could be exploited to bypass security restrictions or poison web caches.

2. Impact Information

Background

Pound is a reverse proxy, load balancer and HTTPS front-end. It allows to distribute the load on several web servers and offers a SSL wrapper for web servers that do not support SSL directly.

Description

Pound fails to handle HTTP requests with conflicting "Content-Length" and "Transfer-Encoding" headers correctly.

Impact

An attacker could exploit this vulnerability by sending HTTP requests with specially crafted "Content-Length" and "Transfer-Encoding" headers to bypass certain security restrictions or to poison the web proxy cache.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Pound users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose www-servers/pound

4. References

CVE-2005-3751

Page updated June 07, 2006

Summary: This is a Gentoo Linux Security Advisory

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