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Apache, mod_ssl: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200509-12 / Apache
Release Date September 19, 2005
Latest Revision December 30, 2007: 03
Impact normal
Exploitable remote and local
Package Vulnerable versions Unaffected versions Architecture(s)
net-www/mod_ssl < 2.8.24 >= 2.8.24 All supported architectures
www-servers/apache < 2.0.54-r15 >= 2.0.54-r15, < 2 All supported architectures

Related bugreports: #103554, #104807


mod_ssl and Apache are vulnerable to a restriction bypass and a potential local privilege escalation.

2.  Impact Information


The Apache HTTP server is one of the most popular web servers on the Internet. mod_ssl provides SSL v2/v3 and TLS v1 support for Apache 1.3 and is also included in Apache 2.


mod_ssl contains a security issue when "SSLVerifyClient optional" is configured in the global virtual host configuration (CAN-2005-2700). Also, Apache's httpd includes a PCRE library, which makes it vulnerable to an integer overflow (CAN-2005-2491).


Under a specific configuration, mod_ssl does not properly enforce the client-based certificate authentication directive, "SSLVerifyClient require", in a per-location context, which could be potentially used by a remote attacker to bypass some restrictions. By creating a specially crafted ".htaccess" file, a local attacker could possibly exploit Apache's vulnerability, which would result in a local privilege escalation.

3.  Resolution Information


There is no known workaround at this time.


All mod_ssl users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-www/mod_ssl-2.8.24"

All Apache 2 users should upgrade to the latest version:

Code Listing 3.2: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-servers/apache-2.0.54-r15"

4.  References


Page updated September 19, 2005

Summary: This is a Gentoo Linux Security Advisory

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