MIT Kerberos 5: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200507-11 / mit-krb5
||July 12, 2005
||July 12, 2005: 01
All supported architectures
MIT Kerberos 5 is vulnerable to a Denial of Service attack and remote
execution of arbitrary code, possibly leading to the compromise of the
entire Kerberos realm.
MIT Kerberos 5 is the free implementation of the Kerberos network
authentication protocol by the Massachusetts Institute of Technology.
Daniel Wachdorf discovered that MIT Kerberos 5 could corrupt the
heap by freeing unallocated memory when receiving a special TCP request
(CAN-2005-1174). He also discovered that the same request could lead to
a single-byte heap overflow (CAN-2005-1175). Magnus Hagander discovered
that krb5_recvauth() function of MIT Kerberos 5 might try to
double-free memory (CAN-2005-1689).
Although exploitation is considered difficult, a remote attacker
could exploit the single-byte heap overflow and the double-free
vulnerability to execute arbitrary code, which could lead to the
compromise of the whole Kerberos realm. A remote attacker could also
use the heap corruption to cause a Denial of Service.
There are no known workarounds at this time.
All MIT Kerberos 5 users should upgrade to the latest available
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.4.1-r1"