The MIT krb5 Key Distribution Center (KDC) implementation can corrupt
the heap by attempting to free memory at a random address when it
receives a certain unlikely (but valid) request via a TCP connection.
This attempt to free unallocated memory can result in a KDC crash and
consequent denial of service. [CAN-2005-1174, VU#259798]
Additionally, the same request, when received by the KDC via either
TCP or UDP, can trigger a bug in the krb5 library which results in a
single-byte overflow of a heap buffer. Application servers are
vulnerable to a highly improbable attack, provided that the attacker
controls a realm sharing a cross-realm key with the target
realm. [CAN-2005-1175, VU#885830]
An unauthenticated attacker may be able to use these vulnerabilities
to execute arbitrary code on the KDC host, potentially compromising an
entire Kerberos realm. No exploit code is known to exist at this
time. Exploitation of these vulnerabilities is believed to be
The krb5_recvauth() function can free previously freed memory under
some error conditions. This vulnerability may allow an
unauthenticated remote attacker to execute arbitrary code.
Exploitation of this vulnerability on a Kerberos Key Distribution
Center (KDC) host can result in compromise of an entire Kerberos
realm. No exploit code is known to exist at this time. Exploitation
of double-free vulnerabilities is believed to be difficult.
Waiting for the ebuild to appear in Portage