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Gentoo Linux Advisory: mit-krb5

Jun 29, 2004, 18:14 (0 Talkback[s])

Gentoo Linux Security Advisory GLSA 200406-21

http://security.gentoo.org/


Severity: High
Title: mit-krb5: Multiple buffer overflows in krb5_aname_to_localname
Date: June 29, 2004
Bugs: #52744
ID: 200406-21


Synopsis

mit-krb5 contains multiple buffer overflows in the function krb5_aname_to_localname(). This could potentially lead to a complete remote system compromise.

Background

mit-krb5 is the free implementation of the Kerberos network authentication protocol by the Massachusetts Institute of Technology.

Affected packages

Package Vulnerable Unaffected
1 app-crypt/mit-krb5 <= 1.3.3 >= 1.3.3-r1

Description

The library function krb5_aname_to_localname() contains multiple buffer overflows. This is only exploitable if explicit mapping or rules-based mapping is enabled. These are not enabled as default.

With explicit mapping enabled, an attacker must authenticate using a principal name listed in the explicit mapping list.

With rules-based mapping enabled, an attacker must first be able to create arbitrary principal names either in the local realm Kerberos realm or in a remote realm from which the local realm's service are reachable by cross-realm authentication.

Impact

An attacker could use these vulnerabilities to execute arbitrary code with the permissions of the user running mit-krb5, which could be the root user.

Workaround

There is no known workaround at this time. All users are encouraged to upgrade to the latest available version.

Resolution

mit-krb5 users should upgrade to the latest version:

    # emerge sync
    # emerge -pv ">=app-crypt/mit-krb5-1.3.3-r1"
    # emerge ">=app-crypt/mit-krb5-1.3.3-r1"

References

[ 1 ] CAN-2004-0523

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0523 [ 2 ] MIT krb5 Security Advisory

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-001-an_to_ln.txt

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200406-21.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.

License

Copyright 2004 Gentoo Technologies, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0