Mod_auth_kerb: Denial of Service — GLSA 200701-14

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

Affected Packages

www-apache/mod_auth_kerb on all architectures
Affected versions < 5.0_rc7-r1
Unaffected versions >= 5.0_rc7-r1

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.

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

Release Date
January 22, 2007

Latest Revision
December 30, 2007: 02

Severity
normal

Exploitable
remote

Bugzilla entries