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

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                         ESB-2009.0330 -- [RedHat]
                          krb5: Denial of service
                               8 April 2009

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              krb5
Publisher:            Red Hat
Operating System:     Red Hat Linux 5
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0846 CVE-2009-0845 CVE-2009-0844

Ref:                  ESB-2009.0304

Original Bulletin:    https://rhn.redhat.com/errata/RHSA-2009-0408.html

Revision History:     April 8 2009: title update
                      April  8 2009: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

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

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

Synopsis:          Important: krb5 security update
Advisory ID:       RHSA-2009:0408-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-0408.html
Issue date:        2009-04-07
CVE Names:         CVE-2009-0844 CVE-2009-0845 CVE-2009-0846 
=====================================================================

1. Summary:

Updated krb5 packages that fix various security issues are now available
for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - 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). The Generic
Security Service Application Program Interface (GSS-API) definition
provides security services to callers (protocols) in a generic fashion. The
Simple and Protected GSS-API Negotiation (SPNEGO) mechanism is used by
GSS-API peers to choose from a common set of security mechanisms.

An input validation flaw was found in the ASN.1 (Abstract Syntax Notation
One) decoder used by MIT Kerberos. A remote attacker could use this flaw to
crash a network service using the MIT Kerberos library, such as kadmind or
krb5kdc, by causing it to dereference or free an uninitialized pointer.
(CVE-2009-0846)

Multiple input validation flaws were found in the MIT Kerberos GSS-API
library's implementation of the SPNEGO mechanism. A remote attacker could
use these flaws to crash any network service utilizing the MIT Kerberos
GSS-API library to authenticate users or, possibly, leak portions of the
service's memory. (CVE-2009-0844, CVE-2009-0845)

All krb5 users should upgrade to these updated packages, which contain
backported patches to correct these issues. 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 that all previously-released
errata relevant to your system have been applied.

This update is available via 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/):

490634 - CVE-2009-0845 krb5: NULL pointer dereference in GSSAPI SPNEGO 
                             (MITKRB5-SA-2009-001)
491033 - CVE-2009-0844 krb5: buffer over-read in SPNEGO GSS-API mechanism 
                             (MITKRB5-SA-2009-001)
491036 - CVE-2009-0846 krb5: ASN.1 decoder can free uninitialized pointer 
                             when decoding an invalid encoding 
                             (MITKRB5-SA-2009-002)

6. Package List:

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-31.el5_3.3.src.rpm

i386:
krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm
krb5-libs-1.6.1-31.el5_3.3.i386.rpm
krb5-workstation-1.6.1-31.el5_3.3.i386.rpm

x86_64:
krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm
krb5-debuginfo-1.6.1-31.el5_3.3.x86_64.rpm
krb5-libs-1.6.1-31.el5_3.3.i386.rpm
krb5-libs-1.6.1-31.el5_3.3.x86_64.rpm
krb5-workstation-1.6.1-31.el5_3.3.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-31.el5_3.3.src.rpm

i386:
krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm
krb5-devel-1.6.1-31.el5_3.3.i386.rpm
krb5-server-1.6.1-31.el5_3.3.i386.rpm

x86_64:
krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm
krb5-debuginfo-1.6.1-31.el5_3.3.x86_64.rpm
krb5-devel-1.6.1-31.el5_3.3.i386.rpm
krb5-devel-1.6.1-31.el5_3.3.x86_64.rpm
krb5-server-1.6.1-31.el5_3.3.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/krb5-1.6.1-31.el5_3.3.src.rpm

i386:
krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm
krb5-devel-1.6.1-31.el5_3.3.i386.rpm
krb5-libs-1.6.1-31.el5_3.3.i386.rpm
krb5-server-1.6.1-31.el5_3.3.i386.rpm
krb5-workstation-1.6.1-31.el5_3.3.i386.rpm

ia64:
krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm
krb5-debuginfo-1.6.1-31.el5_3.3.ia64.rpm
krb5-devel-1.6.1-31.el5_3.3.ia64.rpm
krb5-libs-1.6.1-31.el5_3.3.i386.rpm
krb5-libs-1.6.1-31.el5_3.3.ia64.rpm
krb5-server-1.6.1-31.el5_3.3.ia64.rpm
krb5-workstation-1.6.1-31.el5_3.3.ia64.rpm

ppc:
krb5-debuginfo-1.6.1-31.el5_3.3.ppc.rpm
krb5-debuginfo-1.6.1-31.el5_3.3.ppc64.rpm
krb5-devel-1.6.1-31.el5_3.3.ppc.rpm
krb5-devel-1.6.1-31.el5_3.3.ppc64.rpm
krb5-libs-1.6.1-31.el5_3.3.ppc.rpm
krb5-libs-1.6.1-31.el5_3.3.ppc64.rpm
krb5-server-1.6.1-31.el5_3.3.ppc.rpm
krb5-workstation-1.6.1-31.el5_3.3.ppc.rpm

s390x:
krb5-debuginfo-1.6.1-31.el5_3.3.s390.rpm
krb5-debuginfo-1.6.1-31.el5_3.3.s390x.rpm
krb5-devel-1.6.1-31.el5_3.3.s390.rpm
krb5-devel-1.6.1-31.el5_3.3.s390x.rpm
krb5-libs-1.6.1-31.el5_3.3.s390.rpm
krb5-libs-1.6.1-31.el5_3.3.s390x.rpm
krb5-server-1.6.1-31.el5_3.3.s390x.rpm
krb5-workstation-1.6.1-31.el5_3.3.s390x.rpm

x86_64:
krb5-debuginfo-1.6.1-31.el5_3.3.i386.rpm
krb5-debuginfo-1.6.1-31.el5_3.3.x86_64.rpm
krb5-devel-1.6.1-31.el5_3.3.i386.rpm
krb5-devel-1.6.1-31.el5_3.3.x86_64.rpm
krb5-libs-1.6.1-31.el5_3.3.i386.rpm
krb5-libs-1.6.1-31.el5_3.3.x86_64.rpm
krb5-server-1.6.1-31.el5_3.3.x86_64.rpm
krb5-workstation-1.6.1-31.el5_3.3.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:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0844
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0845
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0846
http://www.redhat.com/security/updates/classification/#important
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-001.txt
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-002.txt

8. Contact:

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

Copyright 2009 Red Hat, Inc.
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.4 (GNU/Linux)

iD8DBQFJ26JGXlSAg2UNWIIRApmQAKCz/3j4ImhDahQrHVvNG0KzAZH2YwCgjbPL
e8VvZn2yybWvy6YMSxmxApQ=
=4z8P
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iD8DBQFJ2/uxNVH5XJJInbgRAgb+AKCJL2+hed5yegON3JpiFkwQsCTplwCfc4TD
XQqOCI7PsAmLlgqfEfbgLA8=
=3APJ
-----END PGP SIGNATURE-----