Moderate: pam_krb5 security update

An updated pam_krb5 package that fixes a security issue is now available
for Red Hat Enterprise Linux 5.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

The pam_krb5 module allows Pluggable Authentication Modules (PAM) aware
applications to use Kerberos to verify user identities by obtaining user
credentials at log in time.

A flaw was found in the pam_krb5 "existing_ticket" configuration option. If
a system is configured to use an existing credential cache via the
"existing_ticket" option, it may be possible for a local user to gain
elevated privileges by using a different, local user's credential cache.
(CVE-2008-3825)

Red Hat would like to thank Stéphane Bertin for responsibly disclosing this
issue.

Users of pam_krb5 should upgrade to this updated package, which contains a
backported patch to resolve this issue.

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

461960 - CVE-2008-3825 pam_krb5 existing_ticket permission flaw

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-3825
http://www.redhat.com/security/updates/classification/#moderate