Mod_auth_kerb: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200701-14 / mod_auth_kerb
Release Date	January 22, 2007
Latest Revision	December 30, 2007: 02
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-apache/mod_auth_kerb	< 5.0_rc7-r1	>= 5.0_rc7-r1	All supported architectures

Related bugreports: #155782

Synopsis

Mod_auth_kerb is vulnerable to a buffer overflow possibly allowing a Denial of Service.

2. Impact Information

Background

Mod_auth_kerb is an Apache authentication module using Kerberos.

Description

Mod_auth_kerb improperly handles component byte encoding in the der_get_oid() function, allowing for a buffer overflow to occur if there are no components which require more than one byte for encoding.

Impact

An attacker could try to access a Kerberos protected resource on an Apache server with an incorrectly configured service principal and crash the server process. It is important to note that this buffer overflow is not known to allow for the execution of code.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All mod_auth_kerb users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-apache/mod_auth_kerb-5.0_rc7-r1"

4. References

CVE-2006-5989

Updated January 22, 2007

Summary: This is a Gentoo Linux Security Advisory

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