[ GLSA 200507-11 ] MIT Kerberos 5: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: MIT Kerberos 5: Multiple vulnerabilities (GLSA 200507-11)
Severity: high
Exploitable: remote
Date: July 12, 2005
Bug(s): #98799
ID: 200507-11

Synopsis


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.


Background


MIT Kerberos 5 is the free implementation of the Kerberos network
authentication protocol by the Massachusetts Institute of Technology.


Affected Packages

Package: app-crypt/mit-krb5
Vulnerable: < 1.4.1-r1
Unaffected: >= 1.4.1-r1
Architectures: All supported architectures


Description


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).


Impact


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.


Workaround


There are no known workarounds at this time.


Resolution


All MIT Kerberos 5 users should upgrade to the latest available
version: