Joined: 25 Feb 2003
Location: Essen, Germany
|Posted: Tue Jun 29, 2004 6:21 pm Post subject: [ GLSA 200406-21 ] mit-krb5: Multiple buffer overflows in kr
|Gentoo Linux Security Advisory
Title: mit-krb5: Multiple buffer overflows in krb5_aname_to_localname (GLSA 200406-21)
Date: June 29, 2004
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.
Vulnerable: <= 1.3.3
Unaffected: >= 1.3.3-r1
Architectures: All supported architectures
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"
MIT krb5 Security Advisory
Last edited by GLSA on Sun May 07, 2006 4:51 pm; edited 1 time in total