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Gentoo Linux Advisory: mit-krb5

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

Gentoo Linux Security Advisory GLSA 200406-21

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


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


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


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.


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.


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


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"


[ 1 ] CAN-2004-0523 [ 2 ] MIT krb5 Security Advisory


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


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 or alternatively, you may file a bug at


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.