97570 2003-04-03 00:13 /135 rader/ <bugzilla@redhat.com>
Importerad: 2003-04-03 00:13 av Brevbäraren
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Ärende: [RHSA-2003:091-01] Updated kerberos packages fix various vulnerabilities
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Red Hat Security Advisory
Synopsis: Updated kerberos packages fix various vulnerabilities
Advisory ID: RHSA-2003:091-01
Issue date: 2003-04-02
Updated on: 2003-04-02
Product: Red Hat Linux
Keywords: krb5
Cross references: RHSA-2003:051 RHSA-2003:052
Obsoletes: RHSA-2003:021
CVE Names: CAN-2003-0028 CAN-2003-082 CAN-2003-0138 CAN-2003-0139
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1. Topic:
Updated Kerberos packages for Red Hat Linux 9 fix a number of
vulnerabilities found in MIT Kerberos.
2. Relevant releases/architectures:
Red Hat Linux 9 - i386
3. Problem description:
Kerberos is a network authentication system. The MIT Kerberos team
released an advisory describing a number of vulnerabilities that
affect the kerberos packages shipped as part of Red Hat Linux
9. These issues include:
Vulnerabilities have been found in the triple-DES key support found
in the implementation of the Kerberos IV authentication protocol
included in MIT Kerberos. The Common Vulnerabilities and Exposures
project has assigned the name CAN-2003-0139 to this issue.
Vulnerabilities have been found in the Kerberos IV authentication
protocol which allow an attacker with knowledge of a cross-realm key,
which is shared with another realm, to impersonate any principal in
that realm to any service in that realm. This vulnerability can only
be closed by disabling cross-realm authentication in Kerberos IV
(CAN-2003-0138).
Vulnerabilities have been found in the RPC library used by the kadmin
service in Kerberos 5. A faulty length check in the RPC library
exposes kadmind to an integer overflow which can be used to crash
kadmind (CAN-2003-0028).
The Key Distribution Center (KDC) allows remote, authenticated
attackers to cause a denial of service (crash) on KDCs within the
same realm via a certain protocol request that causes the KDC to
corrupt its heap (CAN-2003-0082).
All users of Kerberos are advised to upgrade to these errata packages,
which disable cross-realm authentication by default for Kerberos IV
and which contain patches that correct these issues.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list of the RPMs you wish to upgrade. Only
those RPMs which are currently installed will be updated. Those RPMs
which are not installed but included in the list will not be updated.
Note that you can also use wildcards (*.rpm) if your current
directory *only* contains the desired RPMs.
Please note that this update is also available via Red Hat Network.
Many people find this an easier way to apply updates. To use Red Hat
Network, launch the Red Hat Update Agent with the following command:
up2date
This will start an interactive process that will result in the
appropriate RPMs being upgraded on your system.
5. RPMs required:
Red Hat Linux 9:
SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/krb5-1.2.7-14.src.rpm
i386:
ftp://updates.redhat.com/9/en/os/i386/krb5-devel-1.2.7-14.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/krb5-libs-1.2.7-14.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/krb5-server-1.2.7-14.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/krb5-workstation-1.2.7-14.i386.rpm
6. Verification:
MD5 sum Package Name
--------------------------------------------------------------------------
a8520da58b790a356d0a94ae75f7957b 9/en/os/SRPMS/krb5-1.2.7-14.src.rpm
49e7783cb50c3694411b7856d098eff5 9/en/os/i386/krb5-devel-1.2.7-14.i386.rpm
6cb5040d3a4bd21a801e8c1e5da6388d 9/en/os/i386/krb5-libs-1.2.7-14.i386.rpm
8eb2a755c2fdf52b779960ec66cc6783 9/en/os/i386/krb5-server-1.2.7-14.i386.rpm
bbcde88fa4f273c7c45a927dc5b40d58 9/en/os/i386/krb5-workstation-1.2.7-14.i386.rpm
These packages are GPG signed by Red Hat for security. Our key is
available at http://www.redhat.com/solutions/security/news/publickey/
You can verify each package with the following command:
rpm --checksig -v <filename>
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
md5sum <filename>
7. References:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-005-buf.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-004-krb4.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-003-xdr.txt
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0028
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-082
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0138
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0139
8. Contact:
The Red Hat security contact is <security@redhat.com>. More contact
details at http://www.redhat.com/solutions/security/news/contact/
Copyright 2003 Red Hat, Inc.
(97570) / <bugzilla@redhat.com>/----------(Ombruten)