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[ GLSA 200406-21 ] mit-krb5: Multiple buffer overflows in krb5_aname_to_localname
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GLSA
Bodhisattva
Bodhisattva


Joined: 25 Feb 2003
Posts: 3827
Location: Essen, Germany

PostPosted: Tue Jun 29, 2004 6:21 pm    Post subject: [ GLSA 200406-21 ] mit-krb5: Multiple buffer overflows in kr Reply with quote

Gentoo Linux Security Advisory

Title: mit-krb5: Multiple buffer overflows in krb5_aname_to_localname (GLSA 200406-21)
Severity: high
Exploitable: remote
Date: June 29, 2004
Bug(s): #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: app-crypt/mit-krb5
Vulnerable: <= 1.3.3
Unaffected: >= 1.3.3-r1
Architectures: All supported architectures


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


References

CAN-2004-0523
MIT krb5 Security Advisory


Last edited by GLSA on Sun May 07, 2006 4:51 pm; edited 1 time in total
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