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USN-2810-1: Kerberos vulnerabilities

12 November 2015

Several security issues were fixed in Kerberos.

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Releases

Packages

  • krb5 - MIT Kerberos Network Authentication Protocol

Details

It was discovered that the Kerberos kpasswd service incorrectly handled
certain UDP packets. A remote attacker could possibly use this issue to
cause resource consumption, resulting in a denial of service. This issue
only affected Ubuntu 12.04 LTS. (CVE-2002-2443)

It was discovered that Kerberos incorrectly handled null bytes in certain
data fields. A remote attacker could possibly use this issue to cause a
denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu
14.04 LTS. (CVE-2014-5355)

It was discovered that the Kerberos kdcpreauth modules incorrectly tracked
certain client requests. A remote attacker could possibly use this issue
to bypass intended preauthentication requirements. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-2694)

It was discovered that Kerberos incorrectly handled certain SPNEGO packets.
A remote attacker could possibly use this issue to cause a denial of
service. (CVE-2015-2695)

It was discovered that Kerberos incorrectly handled certain IAKERB packets.
A remote attacker could possibly use this issue to cause a denial of
service. (CVE-2015-2696, CVE-2015-2698)

It was discovered that Kerberos incorrectly handled certain TGS requests. A
remote attacker could possibly use this issue to cause a denial of service.
(CVE-2015-2697)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 15.10
Ubuntu 15.04
Ubuntu 14.04
Ubuntu 12.04

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