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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos Null Pointer Dereference in KDC prep_reprocess_req() Lets Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1028431
SecurityTracker URL:  http://securitytracker.com/id/1028431
CVE Reference:   CVE-2013-1416   (Links to External Site)
Date:  Apr 16 2013
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5-1.7 to 5-1.11
Description:   A vulnerability was reported in Kerberos. A remote authenticated user can cause denial of service conditions.

A remote authenticated user can send specially crafted Ticket-granting Server (TGS) request to trigger a null pointer dereference in prep_reprocess_req() and cause the target KDC to crash.

Impact:   A remote authenticated user can cause the target KDC to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2013-0748.html

Vendor URL:  web.mit.edu/kerberos/ (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Apr 16 2013 Kerberos Null Pointer Dereference in KDC prep_reprocess_req() Lets Remote Authenticated Users Deny Service



 Source Message Contents

Subject:  [RHSA-2013:0748-01] Moderate: krb5 security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: krb5 security update
Advisory ID:       RHSA-2013:0748-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0748.html
Issue date:        2013-04-16
CVE Names:         CVE-2013-1416 
=====================================================================

1. Summary:

Updated krb5 packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

3. Description:

Kerberos is a network authentication system which allows clients and
servers to authenticate to each other using symmetric encryption and a
trusted third-party, the Key Distribution Center (KDC).

A NULL pointer dereference flaw was found in the way the MIT Kerberos KDC
processed certain TGS (Ticket-granting Server) requests. A remote,
authenticated attacker could use this flaw to crash the KDC via a
specially-crafted TGS request. (CVE-2013-1416)

All krb5 users should upgrade to these updated packages, which contain a
backported patch to correct this issue. After installing the updated
packages, the krb5kdc daemon will be restarted automatically.

4. 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/knowledge/articles/11258

5. Bugs fixed (http://bugzilla.redhat.com/):

949984 - CVE-2013-1416 krb5: NULL pointer dereference (DoS, KDC crash) by processing certain TGS requests

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.10.3-10.el6_4.2.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-libs-1.10.3-10.el6_4.2.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.i686.rpm
krb5-workstation-1.10.3-10.el6_4.2.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.2.i686.rpm
krb5-libs-1.10.3-10.el6_4.2.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.2.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.10.3-10.el6_4.2.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-devel-1.10.3-10.el6_4.2.i686.rpm
krb5-server-1.10.3-10.el6_4.2.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.2.i686.rpm
krb5-devel-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.10.3-10.el6_4.2.src.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.2.i686.rpm
krb5-libs-1.10.3-10.el6_4.2.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.2.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.10.3-10.el6_4.2.src.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.2.i686.rpm
krb5-devel-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/krb5-1.10.3-10.el6_4.2.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-devel-1.10.3-10.el6_4.2.i686.rpm
krb5-libs-1.10.3-10.el6_4.2.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.i686.rpm
krb5-server-1.10.3-10.el6_4.2.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.i686.rpm
krb5-workstation-1.10.3-10.el6_4.2.i686.rpm

ppc64:
krb5-debuginfo-1.10.3-10.el6_4.2.ppc.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.ppc64.rpm
krb5-devel-1.10.3-10.el6_4.2.ppc.rpm
krb5-devel-1.10.3-10.el6_4.2.ppc64.rpm
krb5-libs-1.10.3-10.el6_4.2.ppc.rpm
krb5-libs-1.10.3-10.el6_4.2.ppc64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.ppc64.rpm
krb5-server-1.10.3-10.el6_4.2.ppc64.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.ppc.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.ppc64.rpm
krb5-workstation-1.10.3-10.el6_4.2.ppc64.rpm

s390x:
krb5-debuginfo-1.10.3-10.el6_4.2.s390.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.s390x.rpm
krb5-devel-1.10.3-10.el6_4.2.s390.rpm
krb5-devel-1.10.3-10.el6_4.2.s390x.rpm
krb5-libs-1.10.3-10.el6_4.2.s390.rpm
krb5-libs-1.10.3-10.el6_4.2.s390x.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.s390x.rpm
krb5-server-1.10.3-10.el6_4.2.s390x.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.s390.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.s390x.rpm
krb5-workstation-1.10.3-10.el6_4.2.s390x.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.2.i686.rpm
krb5-devel-1.10.3-10.el6_4.2.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.2.i686.rpm
krb5-libs-1.10.3-10.el6_4.2.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/krb5-1.10.3-10.el6_4.2.src.rpm

i386:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-devel-1.10.3-10.el6_4.2.i686.rpm
krb5-libs-1.10.3-10.el6_4.2.i686.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.i686.rpm
krb5-server-1.10.3-10.el6_4.2.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.i686.rpm
krb5-workstation-1.10.3-10.el6_4.2.i686.rpm

x86_64:
krb5-debuginfo-1.10.3-10.el6_4.2.i686.rpm
krb5-debuginfo-1.10.3-10.el6_4.2.x86_64.rpm
krb5-devel-1.10.3-10.el6_4.2.i686.rpm
krb5-devel-1.10.3-10.el6_4.2.x86_64.rpm
krb5-libs-1.10.3-10.el6_4.2.i686.rpm
krb5-libs-1.10.3-10.el6_4.2.x86_64.rpm
krb5-pkinit-openssl-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-1.10.3-10.el6_4.2.x86_64.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.i686.rpm
krb5-server-ldap-1.10.3-10.el6_4.2.x86_64.rpm
krb5-workstation-1.10.3-10.el6_4.2.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2013-1416.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2013 Red Hat, Inc.
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