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Category:   Application (Security)  >   Kerberos Vendors:   MIT
(Red Hat Issues Fix) Kerberos GSS-API Library Null Pointer Dereference Lets Remote Authenticated Users Deny Service
SecurityTracker Alert ID:  1023990
SecurityTracker URL:  http://securitytracker.com/id/1023990
CVE Reference:   CVE-2010-1321   (Links to External Site)
Date:  May 18 2010
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5-1.8.1 and prior versions
Description:   A vulnerability was reported in Kerberos. A remote authenticated user can cause denial of service conditions.

A remote authenticated user can send a specially crafted GSS-API token with a missing checksum field to trigger a null pointer dereference in krb5_gss_accept_sec_context() and cause the target GSS-API service to crash. The kadmind server is affected.

Shawn Emery (Oracle) reported this vulnerability.

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

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0423.html

Vendor URL:  web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-005.txt (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  3, 4, 5

Message History:   This archive entry is a follow-up to the message listed below.
May 18 2010 Kerberos GSS-API Library Null Pointer Dereference Lets Remote Authenticated Users Deny Service



 Source Message Contents

Subject:  [RHSA-2010:0423-01] Important: krb5 security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Important: krb5 security update
Advisory ID:       RHSA-2010:0423-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0423.html
Issue date:        2010-05-18
CVE Names:         CVE-2010-1321 
=====================================================================

1. Summary:

Updated krb5 packages that fix one security issue are now available for Red
Hat Enterprise Linux 3, 4, and 5.

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

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, 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 discovered in the MIT Kerberos Generic
Security Service Application Program Interface (GSS-API) library. A remote,
authenticated attacker could use this flaw to crash any server application
using the GSS-API authentication mechanism, by sending a specially-crafted
GSS-API token with a missing checksum field. (CVE-2010-1321)

Red Hat would like to thank the MIT Kerberos Team for responsibly reporting
this issue. Upstream acknowledges Shawn Emery of Oracle as the original
reporter.

All krb5 users should upgrade to these updated packages, which contain a
backported patch to correct this issue. All running services using the MIT
Kerberos libraries must be restarted for the update to take effect.

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
http://kbase.redhat.com/faq/docs/DOC-11259

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

582466 - CVE-2010-1321 krb5: null pointer dereference in GSS-API library leads to DoS (MITKRB5-SA-2010-005)

6. Package List:

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/krb5-1.2.7-72.src.rpm

i386:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-devel-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-server-1.2.7-72.i386.rpm
krb5-workstation-1.2.7-72.i386.rpm

ia64:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-debuginfo-1.2.7-72.ia64.rpm
krb5-devel-1.2.7-72.ia64.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.ia64.rpm
krb5-server-1.2.7-72.ia64.rpm
krb5-workstation-1.2.7-72.ia64.rpm

ppc:
krb5-debuginfo-1.2.7-72.ppc.rpm
krb5-debuginfo-1.2.7-72.ppc64.rpm
krb5-devel-1.2.7-72.ppc.rpm
krb5-libs-1.2.7-72.ppc.rpm
krb5-libs-1.2.7-72.ppc64.rpm
krb5-server-1.2.7-72.ppc.rpm
krb5-workstation-1.2.7-72.ppc.rpm

s390:
krb5-debuginfo-1.2.7-72.s390.rpm
krb5-devel-1.2.7-72.s390.rpm
krb5-libs-1.2.7-72.s390.rpm
krb5-server-1.2.7-72.s390.rpm
krb5-workstation-1.2.7-72.s390.rpm

s390x:
krb5-debuginfo-1.2.7-72.s390.rpm
krb5-debuginfo-1.2.7-72.s390x.rpm
krb5-devel-1.2.7-72.s390x.rpm
krb5-libs-1.2.7-72.s390.rpm
krb5-libs-1.2.7-72.s390x.rpm
krb5-server-1.2.7-72.s390x.rpm
krb5-workstation-1.2.7-72.s390x.rpm

x86_64:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-debuginfo-1.2.7-72.x86_64.rpm
krb5-devel-1.2.7-72.x86_64.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.x86_64.rpm
krb5-server-1.2.7-72.x86_64.rpm
krb5-workstation-1.2.7-72.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/krb5-1.2.7-72.src.rpm

i386:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-devel-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-server-1.2.7-72.i386.rpm
krb5-workstation-1.2.7-72.i386.rpm

x86_64:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-debuginfo-1.2.7-72.x86_64.rpm
krb5-devel-1.2.7-72.x86_64.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.x86_64.rpm
krb5-server-1.2.7-72.x86_64.rpm
krb5-workstation-1.2.7-72.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/krb5-1.2.7-72.src.rpm

i386:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-devel-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-server-1.2.7-72.i386.rpm
krb5-workstation-1.2.7-72.i386.rpm

ia64:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-debuginfo-1.2.7-72.ia64.rpm
krb5-devel-1.2.7-72.ia64.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.ia64.rpm
krb5-server-1.2.7-72.ia64.rpm
krb5-workstation-1.2.7-72.ia64.rpm

x86_64:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-debuginfo-1.2.7-72.x86_64.rpm
krb5-devel-1.2.7-72.x86_64.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.x86_64.rpm
krb5-server-1.2.7-72.x86_64.rpm
krb5-workstation-1.2.7-72.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/krb5-1.2.7-72.src.rpm

i386:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-devel-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-server-1.2.7-72.i386.rpm
krb5-workstation-1.2.7-72.i386.rpm

ia64:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-debuginfo-1.2.7-72.ia64.rpm
krb5-devel-1.2.7-72.ia64.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.ia64.rpm
krb5-server-1.2.7-72.ia64.rpm
krb5-workstation-1.2.7-72.ia64.rpm

x86_64:
krb5-debuginfo-1.2.7-72.i386.rpm
krb5-debuginfo-1.2.7-72.x86_64.rpm
krb5-devel-1.2.7-72.x86_64.rpm
krb5-libs-1.2.7-72.i386.rpm
krb5-libs-1.2.7-72.x86_64.rpm
krb5-server-1.2.7-72.x86_64.rpm
krb5-workstation-1.2.7-72.x86_64.rpm

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/krb5-1.3.4-62.el4_8.2.src.rpm

i386:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-devel-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-server-1.3.4-62.el4_8.2.i386.rpm
krb5-workstation-1.3.4-62.el4_8.2.i386.rpm

ia64:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.ia64.rpm
krb5-devel-1.3.4-62.el4_8.2.ia64.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.ia64.rpm
krb5-server-1.3.4-62.el4_8.2.ia64.rpm
krb5-workstation-1.3.4-62.el4_8.2.ia64.rpm

ppc:
krb5-debuginfo-1.3.4-62.el4_8.2.ppc.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.ppc64.rpm
krb5-devel-1.3.4-62.el4_8.2.ppc.rpm
krb5-libs-1.3.4-62.el4_8.2.ppc.rpm
krb5-libs-1.3.4-62.el4_8.2.ppc64.rpm
krb5-server-1.3.4-62.el4_8.2.ppc.rpm
krb5-workstation-1.3.4-62.el4_8.2.ppc.rpm

s390:
krb5-debuginfo-1.3.4-62.el4_8.2.s390.rpm
krb5-devel-1.3.4-62.el4_8.2.s390.rpm
krb5-libs-1.3.4-62.el4_8.2.s390.rpm
krb5-server-1.3.4-62.el4_8.2.s390.rpm
krb5-workstation-1.3.4-62.el4_8.2.s390.rpm

s390x:
krb5-debuginfo-1.3.4-62.el4_8.2.s390.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.s390x.rpm
krb5-devel-1.3.4-62.el4_8.2.s390x.rpm
krb5-libs-1.3.4-62.el4_8.2.s390.rpm
krb5-libs-1.3.4-62.el4_8.2.s390x.rpm
krb5-server-1.3.4-62.el4_8.2.s390x.rpm
krb5-workstation-1.3.4-62.el4_8.2.s390x.rpm

x86_64:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.x86_64.rpm
krb5-devel-1.3.4-62.el4_8.2.x86_64.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.x86_64.rpm
krb5-server-1.3.4-62.el4_8.2.x86_64.rpm
krb5-workstation-1.3.4-62.el4_8.2.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/krb5-1.3.4-62.el4_8.2.src.rpm

i386:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-devel-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-server-1.3.4-62.el4_8.2.i386.rpm
krb5-workstation-1.3.4-62.el4_8.2.i386.rpm

x86_64:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.x86_64.rpm
krb5-devel-1.3.4-62.el4_8.2.x86_64.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.x86_64.rpm
krb5-server-1.3.4-62.el4_8.2.x86_64.rpm
krb5-workstation-1.3.4-62.el4_8.2.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/krb5-1.3.4-62.el4_8.2.src.rpm

i386:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-devel-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-server-1.3.4-62.el4_8.2.i386.rpm
krb5-workstation-1.3.4-62.el4_8.2.i386.rpm

ia64:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.ia64.rpm
krb5-devel-1.3.4-62.el4_8.2.ia64.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.ia64.rpm
krb5-server-1.3.4-62.el4_8.2.ia64.rpm
krb5-workstation-1.3.4-62.el4_8.2.ia64.rpm

x86_64:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.x86_64.rpm
krb5-devel-1.3.4-62.el4_8.2.x86_64.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.x86_64.rpm
krb5-server-1.3.4-62.el4_8.2.x86_64.rpm
krb5-workstation-1.3.4-62.el4_8.2.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/krb5-1.3.4-62.el4_8.2.src.rpm

i386:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-devel-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-server-1.3.4-62.el4_8.2.i386.rpm
krb5-workstation-1.3.4-62.el4_8.2.i386.rpm

ia64:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.ia64.rpm
krb5-devel-1.3.4-62.el4_8.2.ia64.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.ia64.rpm
krb5-server-1.3.4-62.el4_8.2.ia64.rpm
krb5-workstation-1.3.4-62.el4_8.2.ia64.rpm

x86_64:
krb5-debuginfo-1.3.4-62.el4_8.2.i386.rpm
krb5-debuginfo-1.3.4-62.el4_8.2.x86_64.rpm
krb5-devel-1.3.4-62.el4_8.2.x86_64.rpm
krb5-libs-1.3.4-62.el4_8.2.i386.rpm
krb5-libs-1.3.4-62.el4_8.2.x86_64.rpm
krb5-server-1.3.4-62.el4_8.2.x86_64.rpm
krb5-workstation-1.3.4-62.el4_8.2.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-36.el5_5.4.src.rpm

i386:
krb5-debuginfo-1.6.1-36.el5_5.4.i386.rpm
krb5-devel-1.6.1-36.el5_5.4.i386.rpm
krb5-libs-1.6.1-36.el5_5.4.i386.rpm
krb5-server-1.6.1-36.el5_5.4.i386.rpm
krb5-workstation-1.6.1-36.el5_5.4.i386.rpm

x86_64:
krb5-debuginfo-1.6.1-36.el5_5.4.i386.rpm
krb5-debuginfo-1.6.1-36.el5_5.4.x86_64.rpm
krb5-libs-1.6.1-36.el5_5.4.i386.rpm
krb5-libs-1.6.1-36.el5_5.4.x86_64.rpm
krb5-workstation-1.6.1-36.el5_5.4.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-36.el5_5.4.src.rpm

i386:
krb5-debuginfo-1.6.1-36.el5_5.4.i386.rpm
krb5-devel-1.6.1-36.el5_5.4.i386.rpm
krb5-server-1.6.1-36.el5_5.4.i386.rpm

x86_64:
krb5-debuginfo-1.6.1-36.el5_5.4.i386.rpm
krb5-debuginfo-1.6.1-36.el5_5.4.x86_64.rpm
krb5-devel-1.6.1-36.el5_5.4.i386.rpm
krb5-devel-1.6.1-36.el5_5.4.x86_64.rpm
krb5-server-1.6.1-36.el5_5.4.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/krb5-1.6.1-36.el5_5.4.src.rpm

i386:
krb5-debuginfo-1.6.1-36.el5_5.4.i386.rpm
krb5-devel-1.6.1-36.el5_5.4.i386.rpm
krb5-libs-1.6.1-36.el5_5.4.i386.rpm
krb5-server-1.6.1-36.el5_5.4.i386.rpm
krb5-workstation-1.6.1-36.el5_5.4.i386.rpm

ia64:
krb5-debuginfo-1.6.1-36.el5_5.4.i386.rpm
krb5-debuginfo-1.6.1-36.el5_5.4.ia64.rpm
krb5-devel-1.6.1-36.el5_5.4.ia64.rpm
krb5-libs-1.6.1-36.el5_5.4.i386.rpm
krb5-libs-1.6.1-36.el5_5.4.ia64.rpm
krb5-server-1.6.1-36.el5_5.4.ia64.rpm
krb5-workstation-1.6.1-36.el5_5.4.ia64.rpm

ppc:
krb5-debuginfo-1.6.1-36.el5_5.4.ppc.rpm
krb5-debuginfo-1.6.1-36.el5_5.4.ppc64.rpm
krb5-devel-1.6.1-36.el5_5.4.ppc.rpm
krb5-devel-1.6.1-36.el5_5.4.ppc64.rpm
krb5-libs-1.6.1-36.el5_5.4.ppc.rpm
krb5-libs-1.6.1-36.el5_5.4.ppc64.rpm
krb5-server-1.6.1-36.el5_5.4.ppc.rpm
krb5-workstation-1.6.1-36.el5_5.4.ppc.rpm

s390x:
krb5-debuginfo-1.6.1-36.el5_5.4.s390.rpm
krb5-debuginfo-1.6.1-36.el5_5.4.s390x.rpm
krb5-devel-1.6.1-36.el5_5.4.s390.rpm
krb5-devel-1.6.1-36.el5_5.4.s390x.rpm
krb5-libs-1.6.1-36.el5_5.4.s390.rpm
krb5-libs-1.6.1-36.el5_5.4.s390x.rpm
krb5-server-1.6.1-36.el5_5.4.s390x.rpm
krb5-workstation-1.6.1-36.el5_5.4.s390x.rpm

x86_64:
krb5-debuginfo-1.6.1-36.el5_5.4.i386.rpm
krb5-debuginfo-1.6.1-36.el5_5.4.x86_64.rpm
krb5-devel-1.6.1-36.el5_5.4.i386.rpm
krb5-devel-1.6.1-36.el5_5.4.x86_64.rpm
krb5-libs-1.6.1-36.el5_5.4.i386.rpm
krb5-libs-1.6.1-36.el5_5.4.x86_64.rpm
krb5-server-1.6.1-36.el5_5.4.x86_64.rpm
krb5-workstation-1.6.1-36.el5_5.4.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://www.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2010-1321.html
http://www.redhat.com/security/updates/classification/#important
http://web.mit.edu/Kerberos/advisories/MITKRB5-SA-2010-005.txt

8. Contact:

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

Copyright 2010 Red Hat, Inc.
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