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                   Red Hat Security Advisory

Synopsis:          Updated krb5 packages fix security vulnerabilities
Advisory ID:       RHSA-2004:448-01
Issue date:        2004-08-31
Updated on:        2004-08-31
Product:           Red Hat Enterprise Linux
Keywords:          krb5 double-free asn.1
Obsoletes:         RHSA-2004:236
CVE Names:         CAN-2004-0642 CAN-2004-0643 CAN-2004-0644
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1. Summary:

Updated Kerberos (krb5) packages that correct double-free and ASN.1
parsing bugs are now available for Red Hat Enterprise Linux.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386

3. Problem description:

Kerberos is a networked authentication system that uses a trusted third
party (a KDC) to authenticate clients and servers to each other.

Several double-free bugs were found in the Kerberos 5 KDC and libraries.  A
remote attacker could potentially exploit these flaws to execute arbitrary
code.  The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the names CAN-2004-0642 and CAN-2004-0643 to these issues.

A double-free bug was also found in the krb524 server (CAN-2004-0772),
however this issue was fixed for Red Hat Enterprise Linux 2.1 users by a
previous erratum, RHSA-2003:052.

An infinite loop bug was found in the Kerberos 5 ASN.1 decoder library.  A
remote attacker may be able to trigger this flaw and cause a denial of
service. The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the name CAN-2004-0644 to this issue.

All users of krb5 should upgrade to these updated packages, which contain
backported security patches to resolve these issues.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  Use Red Hat
Network to download and update your packages.  To launch the Red Hat
Update Agent, use the following command:

    up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

    http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/ for more info):

129680 - Upgrading to krb5-libs 1.2.2-27 can cause undefined symbol __dn_expand

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568  krb5-1.2.2-31.src.rpm

i386:
f5fc294848750e1186efd792aaca3fa1  krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0  krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7  krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49  krb5-workstation-1.2.2-31.i386.rpm

ia64:
d81f70e064675a486c9a796fd1ea6297  krb5-devel-1.2.2-31.ia64.rpm
bd5eeae1a8d4b97585bbe67b746edb1d  krb5-libs-1.2.2-31.ia64.rpm
bb30a6820d6c475452458a3cebca55b8  krb5-server-1.2.2-31.ia64.rpm
c7b3177d7e82f890ef669196c2ff0f8f  krb5-workstation-1.2.2-31.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568  krb5-1.2.2-31.src.rpm

ia64:
d81f70e064675a486c9a796fd1ea6297  krb5-devel-1.2.2-31.ia64.rpm
bd5eeae1a8d4b97585bbe67b746edb1d  krb5-libs-1.2.2-31.ia64.rpm
bb30a6820d6c475452458a3cebca55b8  krb5-server-1.2.2-31.ia64.rpm
c7b3177d7e82f890ef669196c2ff0f8f  krb5-workstation-1.2.2-31.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568  krb5-1.2.2-31.src.rpm

i386:
f5fc294848750e1186efd792aaca3fa1  krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0  krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7  krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49  krb5-workstation-1.2.2-31.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/krb5-1.2.2-31.src.rpm
908bd9ee7963203d5c086e25b0849568  krb5-1.2.2-31.src.rpm

i386:
f5fc294848750e1186efd792aaca3fa1  krb5-devel-1.2.2-31.i386.rpm
1da2499c2aa50026be1eda1774cb8fc0  krb5-libs-1.2.2-31.i386.rpm
72749007a7033ff2a31dc4ee20a439c7  krb5-server-1.2.2-31.i386.rpm
be44496d6d25c3e5c1754ce871b3de49  krb5-workstation-1.2.2-31.i386.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.html#package

7. References:

http://web.mit.edu/kerberos/advisories/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0642
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0643
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0644

8. Contact:

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

Copyright 2004 Red Hat, Inc.
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