RHBA-2011:0711 - Bug Fix Advisory

Topic

An updated pam_krb5 package that fixes two bugs is now available for Red Hat
Enterprise Linux 6.

Description

The pam_krb5 module allows PAM-aware applications to verify and change user
passwords with the help of a KDC.

This update fixes the following bugs:

• Previously, pam_krb5 ignored the "verify_ap_req_nofail" configuration setting

when it checked whether the credentials from the Key Distribution Center (KDC)
were spoofed because of a missing or otherwise inaccessible local keytab file.
Due to this behavior, pam_krb5 wrongly returned a success message. This update
reworks the credential verification. Now, the verification settings work as
expected. (BZ#622938)

• Previously, pam_krb5 used a format for password change requests that earlier

versions of kadmind could not process. This update uses application programming
interfaces (API) that format password change requests which can also be parsed
by earlier versions of kadmind. (BZ#690583)

All pam_krb5 users are advised to upgrade to this updated package, which fixes
these bugs.

Solution

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259/

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 638586 - pam_krb5 test suite improvements for new MIT krb5
• BZ - 690583 - passwd, gdm-password fail to change password with pam_krb5 enabled

CVEs

(none)

References

(none)