Unknown vulnerability in the chk_trans.c of the libkrb5 library for MIT Kerberos V5 before 1.2.5 allows users from one realm to impersonate users in other realms that have the same inter-realm keys.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11188
http://www.securityfocus.com/bid/6714
http://www.redhat.com/support/errata/RHSA-2003-168.html
http://www.redhat.com/support/errata/RHSA-2003-052.html
http://www.redhat.com/support/errata/RHSA-2003-051.html
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2003:043
http://www.kb.cert.org/vuls/id/684563
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-001-multiple.txt
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000639