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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200406-21] mit-krb5: Multiple buffer overflows in krb5_aname_to_localname

Vulnerability Assessment Details

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

Vulnerability Assessment Summary
mit-krb5: Multiple buffer overflows in krb5_aname_to_localname

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200406-21
(mit-krb5: Multiple buffer overflows in krb5_aname_to_localname)

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, a possible hacker must authenticate using a
principal name listed in the explicit mapping list.
With rules-based mapping enabled, a possible hacker 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

A possible hacker 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.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0523
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2004-001-an_to_ln.txt

Solution:
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"

Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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