USN-2310-1: Kerberos vulnerabilities

11 August 2014

Several security issues were fixed in Kerberos.

Releases

Packages

  • krb5 - MIT Kerberos Network Authentication Protocol

Details

It was discovered that Kerberos incorrectly handled certain crafted Draft 9
requests. A remote attacker could use this issue to cause the daemon to
crash, resulting in a denial of service. This issue only affected Ubuntu
12.04 LTS. (CVE-2012-1016)

It was discovered that Kerberos incorrectly handled certain malformed
KRB5_PADATA_PK_AS_REQ AS-REQ requests. A remote attacker could use this
issue to cause the daemon to crash, resulting in a denial of service. This
issue only affected Ubuntu 10.04 LTS and Ubuntu 12.04 LTS. (CVE-2013-1415)

It was discovered that Kerberos incorrectly handled certain crafted TGS-REQ
requests. A remote authenticated attacker could use this issue to cause the
daemon to crash, resulting in a denial of service. This issue only affected
Ubuntu 10.04 LTS and Ubuntu 12.04 LTS. (CVE-2013-1416)

It was discovered that Kerberos incorrectly handled certain crafted
requests when multiple realms were configured. A remote attacker could use
this issue to cause the daemon to crash, resulting in a denial of service.
This issue only affected Ubuntu 10.04 LTS and Ubuntu 12.04 LTS.
(CVE-2013-1418, CVE-2013-6800)

It was discovered that Kerberos incorrectly handled certain invalid tokens.
If a remote attacker were able to perform a man-in-the-middle attack, this
flaw could be used to cause the daemon to crash, resulting in a denial of
service. (CVE-2014-4341, CVE-2014-4342)

It was discovered that Kerberos incorrectly handled certain mechanisms when
used with SPNEGO. If a remote attacker were able to perform a
man-in-the-middle attack, this flaw could be used to cause clients to
crash, resulting in a denial of service. (CVE-2014-4343)

It was discovered that Kerberos incorrectly handled certain continuation
tokens during SPNEGO negotiations. A remote attacker could use this issue
to cause the daemon to crash, resulting in a denial of service.
(CVE-2014-4344)

Tomas Kuthan and Greg Hudson discovered that the Kerberos kadmind daemon
incorrectly handled buffers when used with the LDAP backend. A remote
attacker could use this issue to cause the daemon to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2014-4345)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.04
Ubuntu 12.04
Ubuntu 10.04

In general, a standard system update will make all the necessary changes.