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Pound: HTTP request smuggling


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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.


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


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


There is no known workaround at this time.


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


Page updated June 07, 2006

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