GLSA 200701-14: Mod_auth_kerb: Denial of Service

http://security.gentoo.org/

Severity:	normal
Title:	Mod_auth_kerb: Denial of Service
Date:	01/22/2007
Bugs:	#155782
ID:	200701-14

Synopsis

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

Background

Mod_auth_kerb is an Apache authentication module using Kerberos.

Affected packages

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

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.

Workaround

There is no known workaround at this time.

Resolution

All mod_auth_kerb users should upgrade to the latest version:

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

References

CVE-2006-5989

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200701-14.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.