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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1026214
SecurityTracker URL:  http://securitytracker.com/id/1026214
CVE Reference:   CVE-2011-1527, CVE-2011-1528, CVE-2011-1529, CVE-2011-4151   (Links to External Site)
Date:  Oct 19 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): krb5-1.8, krb5-1.9
Description:   Three vulnerabilities were reported in Kerberos. A remote user can cause the target Key Distribution Center (KDC) to crash.

A remote user can send specially crafted data to trigger a null pointer dereference and cause the target KDC to crash.

One vulnerability resides in krb5_ldap_get_principal() in the KDC LDAP back end [CVE-2011-1527]. Nalin Dahyabhai, Andrej Ota, and Kyle Moffett independently reported this vulnerability.

One vulnerability resides in krb5_ldap_lockout_audit() and krb5_db2_lockout_audit() [CVE-2011-1528]. Mark Deneen reported this vulnerability.

One vulnerability resides in lookup_lockout_policy() [CVE-2011-1529].

One vulnerability resides in the Berkeley DB ('db2') back end [CVE-2011-4151].

Impact:   A remote 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-2011-1379.html

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt (Links to External Site)
Cause:   Access control 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.
Oct 19 2011 Kerberos KDC Null Pointer Dereference Bugs Let Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2011:1379-01] Moderate: krb5 security update

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

Synopsis:          Moderate: krb5 security update
Advisory ID:       RHSA-2011:1379-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1379.html
Issue date:        2011-10-18
CVE Names:         CVE-2011-1527 CVE-2011-1528 CVE-2011-1529 
=====================================================================

1. Summary:

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

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links 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).

Multiple NULL pointer dereference and assertion failure flaws were found
in the MIT Kerberos KDC when it was configured to use an LDAP (Lightweight
Directory Access Protocol) or Berkeley Database (Berkeley DB) back end. A
remote attacker could use these flaws to crash the KDC. (CVE-2011-1527,
CVE-2011-1528, CVE-2011-1529)

Red Hat would like to thank the MIT Kerberos project for reporting the
CVE-2011-1527 issue. Upstream acknowledges Andrej Ota as the original
reporter of CVE-2011-1527.

All krb5 users should upgrade to these updated packages, which contain a
backported patch to correct these issues. 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/kb/docs/DOC-11259

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

737711 - CVE-2011-1527 CVE-2011-1528 CVE-2011-1529 krb5: KDC denial of service vulnerabilities (MITKRB5-SA-2011-006)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.9-9.el6_1.2.src.rpm

i386:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-libs-1.9-9.el6_1.2.i686.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.i686.rpm
krb5-workstation-1.9-9.el6_1.2.i686.rpm

x86_64:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm
krb5-libs-1.9-9.el6_1.2.i686.rpm
krb5-libs-1.9-9.el6_1.2.x86_64.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.x86_64.rpm
krb5-workstation-1.9-9.el6_1.2.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.9-9.el6_1.2.src.rpm

i386:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-devel-1.9-9.el6_1.2.i686.rpm
krb5-server-1.9-9.el6_1.2.i686.rpm
krb5-server-ldap-1.9-9.el6_1.2.i686.rpm

x86_64:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm
krb5-devel-1.9-9.el6_1.2.i686.rpm
krb5-devel-1.9-9.el6_1.2.x86_64.rpm
krb5-server-1.9-9.el6_1.2.x86_64.rpm
krb5-server-ldap-1.9-9.el6_1.2.i686.rpm
krb5-server-ldap-1.9-9.el6_1.2.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.9-9.el6_1.2.src.rpm

x86_64:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm
krb5-libs-1.9-9.el6_1.2.i686.rpm
krb5-libs-1.9-9.el6_1.2.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/krb5-1.9-9.el6_1.2.src.rpm

x86_64:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm
krb5-devel-1.9-9.el6_1.2.i686.rpm
krb5-devel-1.9-9.el6_1.2.x86_64.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.x86_64.rpm
krb5-server-1.9-9.el6_1.2.x86_64.rpm
krb5-server-ldap-1.9-9.el6_1.2.i686.rpm
krb5-server-ldap-1.9-9.el6_1.2.x86_64.rpm
krb5-workstation-1.9-9.el6_1.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/krb5-1.9-9.el6_1.2.src.rpm

i386:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-devel-1.9-9.el6_1.2.i686.rpm
krb5-libs-1.9-9.el6_1.2.i686.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.i686.rpm
krb5-server-1.9-9.el6_1.2.i686.rpm
krb5-server-ldap-1.9-9.el6_1.2.i686.rpm
krb5-workstation-1.9-9.el6_1.2.i686.rpm

ppc64:
krb5-debuginfo-1.9-9.el6_1.2.ppc.rpm
krb5-debuginfo-1.9-9.el6_1.2.ppc64.rpm
krb5-devel-1.9-9.el6_1.2.ppc.rpm
krb5-devel-1.9-9.el6_1.2.ppc64.rpm
krb5-libs-1.9-9.el6_1.2.ppc.rpm
krb5-libs-1.9-9.el6_1.2.ppc64.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.ppc64.rpm
krb5-server-1.9-9.el6_1.2.ppc64.rpm
krb5-server-ldap-1.9-9.el6_1.2.ppc.rpm
krb5-server-ldap-1.9-9.el6_1.2.ppc64.rpm
krb5-workstation-1.9-9.el6_1.2.ppc64.rpm

s390x:
krb5-debuginfo-1.9-9.el6_1.2.s390.rpm
krb5-debuginfo-1.9-9.el6_1.2.s390x.rpm
krb5-devel-1.9-9.el6_1.2.s390.rpm
krb5-devel-1.9-9.el6_1.2.s390x.rpm
krb5-libs-1.9-9.el6_1.2.s390.rpm
krb5-libs-1.9-9.el6_1.2.s390x.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.s390x.rpm
krb5-server-1.9-9.el6_1.2.s390x.rpm
krb5-server-ldap-1.9-9.el6_1.2.s390.rpm
krb5-server-ldap-1.9-9.el6_1.2.s390x.rpm
krb5-workstation-1.9-9.el6_1.2.s390x.rpm

x86_64:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm
krb5-devel-1.9-9.el6_1.2.i686.rpm
krb5-devel-1.9-9.el6_1.2.x86_64.rpm
krb5-libs-1.9-9.el6_1.2.i686.rpm
krb5-libs-1.9-9.el6_1.2.x86_64.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.x86_64.rpm
krb5-server-1.9-9.el6_1.2.x86_64.rpm
krb5-server-ldap-1.9-9.el6_1.2.i686.rpm
krb5-server-ldap-1.9-9.el6_1.2.x86_64.rpm
krb5-workstation-1.9-9.el6_1.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/krb5-1.9-9.el6_1.2.src.rpm

i386:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-devel-1.9-9.el6_1.2.i686.rpm
krb5-libs-1.9-9.el6_1.2.i686.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.i686.rpm
krb5-server-1.9-9.el6_1.2.i686.rpm
krb5-server-ldap-1.9-9.el6_1.2.i686.rpm
krb5-workstation-1.9-9.el6_1.2.i686.rpm

x86_64:
krb5-debuginfo-1.9-9.el6_1.2.i686.rpm
krb5-debuginfo-1.9-9.el6_1.2.x86_64.rpm
krb5-devel-1.9-9.el6_1.2.i686.rpm
krb5-devel-1.9-9.el6_1.2.x86_64.rpm
krb5-libs-1.9-9.el6_1.2.i686.rpm
krb5-libs-1.9-9.el6_1.2.x86_64.rpm
krb5-pkinit-openssl-1.9-9.el6_1.2.x86_64.rpm
krb5-server-1.9-9.el6_1.2.x86_64.rpm
krb5-server-ldap-1.9-9.el6_1.2.i686.rpm
krb5-server-ldap-1.9-9.el6_1.2.x86_64.rpm
krb5-workstation-1.9-9.el6_1.2.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-2011-1527.html
https://www.redhat.com/security/data/cve/CVE-2011-1528.html
https://www.redhat.com/security/data/cve/CVE-2011-1529.html
https://access.redhat.com/security/updates/classification/#moderate
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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