mod_ssl: Format string vulnerability

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-www/mod_ssl	<= 2.8.18	>= 2.8.19	All supported architectures

Related bugreports: #57379

A bug in mod_ssl may allow a remote attacker to execute arbitrary code when Apache is configured to use mod_ssl and mod_proxy.

2. Impact Information

mod_ssl provides Secure Sockets Layer encryption and authentication to Apache 1.3.

A bug in ssl_engine_ext.c makes mod_ssl vulnerable to a ssl_log() related format string vulnerability in the mod_proxy hook functions.

Given the right server configuration, an attacker could execute code as the user running Apache, usually "apache".

3. Resolution Information

A server should not be vulnerable if it is not using both mod_ssl and mod_proxy. Otherwise there is no workaround other than to disable mod_ssl.

All mod_ssl users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=net-www/mod_ssl-2.8.19"
# emerge ">=net-www/mod_ssl-2.8.19"

4. References

Updated July 22, 2004

Summary: This is a Gentoo Linux Security Advisory

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