MIT KRB5 Security Advisory 2003-004 - A cryptographic weakness in version 4 of the Kerberos protocol allows an attacker to use a chosen-plaintext attack to impersonate any principal in a realm. Additional cryptographic weaknesses in the krb4 implementation included in the MIT krb5 distribution permit the use of cut-and-paste attacks to fabricate krb4 tickets for unauthorized client principals, effectively subverting a site's entire Kerberos authentication infrastructure. Patch available here.
MIT KRB5 Security Advisory 2003-004 - A cryptographic weakness in version 4 of the Kerberos protocol allows an attacker to use a chosen-plaintext attack to impersonate any principal in a realm. Additional cryptographic weaknesses in the krb4 implementation included in the MIT krb5 distribution permit the use of cut-and-paste attacks to fabricate krb4 tickets for unauthorized client principals, effectively subverting a site's entire Kerberos authentication infrastructure. Patch available here.