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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) MIT Kerberos Key Distribution Center Heap Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1027328
SecurityTracker URL:  http://securitytracker.com/id/1027328
CVE Reference:   CVE-2012-1015   (Links to External Site)
Date:  Jul 31 2012
Impact:   Denial of service via network, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5-1.8 and after
Description:   Two vulnerabilities were reported in the Kerberos KDC. A remote user can execute arbitrary code on the target system. A remote user can cause denial of service conditions.

A remote user can send a specially crafted AS-REQ message to the target key distribution center (KDC) to free an uninitialized pointer, corrupting the heap and executing arbitrary code on the target system [CVE-2012-1015]. The code will run with the privileges of the target service.

A remote user can send a specially crafted AS-REQ message to the target KDC to dereference an uninitialized pointer and cause the KDC daemon to crash [CVE-2012-1014].

Emmanuel Bouillon (NCI Agency) reported these vulnerabilities.

Impact:   A remote user can execute arbitrary code on the target system.

A remote user can cause denial of service conditions.

Solution:   Red Hat has issued a fix for CVE-2012-1015.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-1131.html

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2012-001.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.
Jul 31 2012 MIT Kerberos Key Distribution Center Heap Corruption Flaw Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2012:1131-01] Important: krb5 security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: krb5 security update
Advisory ID:       RHSA-2012:1131-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1131.html
Issue date:        2012-07-31
CVE Names:         CVE-2012-1013 CVE-2012-1015 
=====================================================================

1. Summary:

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

The Red Hat Security Response Team has rated this update as having
important 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).

An uninitialized pointer use flaw was found in the way the MIT Kerberos KDC
handled initial authentication requests (AS-REQ). A remote,
unauthenticated attacker could use this flaw to crash the KDC via a
specially-crafted AS-REQ request. (CVE-2012-1015)

A NULL pointer dereference flaw was found in the MIT Kerberos
administration daemon, kadmind. A Kerberos administrator who has the
"create" privilege could use this flaw to crash kadmind. (CVE-2012-1013)

Red Hat would like to thank the MIT Kerberos project for reporting
CVE-2012-1015. Upstream acknowledges Emmanuel Bouillon (NCI Agency) as the
original reporter of CVE-2012-1015.

All krb5 users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the updated
packages, the krb5kdc and kadmind daemons 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/):

827517 - CVE-2012-1013 krb5: kadmind denial of service
838012 - CVE-2012-1015 krb5: KDC daemon crash via free() of an uninitialized pointer

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.9-33.el6_3.2.src.rpm

i386:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-libs-1.9-33.el6_3.2.i686.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.i686.rpm
krb5-workstation-1.9-33.el6_3.2.i686.rpm

x86_64:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm
krb5-libs-1.9-33.el6_3.2.i686.rpm
krb5-libs-1.9-33.el6_3.2.x86_64.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.x86_64.rpm
krb5-workstation-1.9-33.el6_3.2.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/krb5-1.9-33.el6_3.2.src.rpm

i386:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-devel-1.9-33.el6_3.2.i686.rpm
krb5-server-1.9-33.el6_3.2.i686.rpm
krb5-server-ldap-1.9-33.el6_3.2.i686.rpm

x86_64:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm
krb5-devel-1.9-33.el6_3.2.i686.rpm
krb5-devel-1.9-33.el6_3.2.x86_64.rpm
krb5-server-1.9-33.el6_3.2.x86_64.rpm
krb5-server-ldap-1.9-33.el6_3.2.i686.rpm
krb5-server-ldap-1.9-33.el6_3.2.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/krb5-1.9-33.el6_3.2.src.rpm

x86_64:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm
krb5-libs-1.9-33.el6_3.2.i686.rpm
krb5-libs-1.9-33.el6_3.2.x86_64.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.x86_64.rpm
krb5-workstation-1.9-33.el6_3.2.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/krb5-1.9-33.el6_3.2.src.rpm

x86_64:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm
krb5-devel-1.9-33.el6_3.2.i686.rpm
krb5-devel-1.9-33.el6_3.2.x86_64.rpm
krb5-server-1.9-33.el6_3.2.x86_64.rpm
krb5-server-ldap-1.9-33.el6_3.2.i686.rpm
krb5-server-ldap-1.9-33.el6_3.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/krb5-1.9-33.el6_3.2.src.rpm

i386:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-devel-1.9-33.el6_3.2.i686.rpm
krb5-libs-1.9-33.el6_3.2.i686.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.i686.rpm
krb5-server-1.9-33.el6_3.2.i686.rpm
krb5-server-ldap-1.9-33.el6_3.2.i686.rpm
krb5-workstation-1.9-33.el6_3.2.i686.rpm

ppc64:
krb5-debuginfo-1.9-33.el6_3.2.ppc.rpm
krb5-debuginfo-1.9-33.el6_3.2.ppc64.rpm
krb5-devel-1.9-33.el6_3.2.ppc.rpm
krb5-devel-1.9-33.el6_3.2.ppc64.rpm
krb5-libs-1.9-33.el6_3.2.ppc.rpm
krb5-libs-1.9-33.el6_3.2.ppc64.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.ppc64.rpm
krb5-server-1.9-33.el6_3.2.ppc64.rpm
krb5-server-ldap-1.9-33.el6_3.2.ppc.rpm
krb5-server-ldap-1.9-33.el6_3.2.ppc64.rpm
krb5-workstation-1.9-33.el6_3.2.ppc64.rpm

s390x:
krb5-debuginfo-1.9-33.el6_3.2.s390.rpm
krb5-debuginfo-1.9-33.el6_3.2.s390x.rpm
krb5-devel-1.9-33.el6_3.2.s390.rpm
krb5-devel-1.9-33.el6_3.2.s390x.rpm
krb5-libs-1.9-33.el6_3.2.s390.rpm
krb5-libs-1.9-33.el6_3.2.s390x.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.s390x.rpm
krb5-server-1.9-33.el6_3.2.s390x.rpm
krb5-server-ldap-1.9-33.el6_3.2.s390.rpm
krb5-server-ldap-1.9-33.el6_3.2.s390x.rpm
krb5-workstation-1.9-33.el6_3.2.s390x.rpm

x86_64:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm
krb5-devel-1.9-33.el6_3.2.i686.rpm
krb5-devel-1.9-33.el6_3.2.x86_64.rpm
krb5-libs-1.9-33.el6_3.2.i686.rpm
krb5-libs-1.9-33.el6_3.2.x86_64.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.x86_64.rpm
krb5-server-1.9-33.el6_3.2.x86_64.rpm
krb5-server-ldap-1.9-33.el6_3.2.i686.rpm
krb5-server-ldap-1.9-33.el6_3.2.x86_64.rpm
krb5-workstation-1.9-33.el6_3.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/krb5-1.9-33.el6_3.2.src.rpm

i386:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-devel-1.9-33.el6_3.2.i686.rpm
krb5-libs-1.9-33.el6_3.2.i686.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.i686.rpm
krb5-server-1.9-33.el6_3.2.i686.rpm
krb5-server-ldap-1.9-33.el6_3.2.i686.rpm
krb5-workstation-1.9-33.el6_3.2.i686.rpm

x86_64:
krb5-debuginfo-1.9-33.el6_3.2.i686.rpm
krb5-debuginfo-1.9-33.el6_3.2.x86_64.rpm
krb5-devel-1.9-33.el6_3.2.i686.rpm
krb5-devel-1.9-33.el6_3.2.x86_64.rpm
krb5-libs-1.9-33.el6_3.2.i686.rpm
krb5-libs-1.9-33.el6_3.2.x86_64.rpm
krb5-pkinit-openssl-1.9-33.el6_3.2.x86_64.rpm
krb5-server-1.9-33.el6_3.2.x86_64.rpm
krb5-server-ldap-1.9-33.el6_3.2.i686.rpm
krb5-server-ldap-1.9-33.el6_3.2.x86_64.rpm
krb5-workstation-1.9-33.el6_3.2.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-2012-1013.html
https://www.redhat.com/security/data/cve/CVE-2012-1015.html
https://access.redhat.com/security/updates/classification/#important
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2012-001.txt

8. Contact:

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

Copyright 2012 Red Hat, Inc.
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