USN-1520-1: Kerberos vulnerabilities

Releases

• Ubuntu 12.04
• Ubuntu 11.10
• Ubuntu 11.04
• Ubuntu 10.04

Packages

• krb5 - MIT Kerberos Network Authentication Protocol

Details

Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center
(KDC) daemon could free an uninitialized pointer when handling a
malformed AS-REQ message. A remote unauthenticated attacker could
use this to cause a denial of service or possibly execute arbitrary
code. (CVE-2012-1015)

Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center
(KDC) daemon could dereference an uninitialized pointer while handling
a malformed AS-REQ message. A remote unauthenticated attacker could
use this to cause a denial of service or possibly execute arbitrary
code. This issue only affected Ubuntu 12.04 LTS. (CVE-2012-1014)

Simo Sorce discovered that the MIT krb5 Key Distribution Center (KDC)
daemon could dereference a NULL pointer when handling a malformed
TGS-REQ message. A remote authenticated attacker could use this to
cause a denial of service. (CVE-2012-1013)

It was discovered that the kadmin protocol implementation in MIT krb5
did not properly restrict access to the SET_STRING and GET_STRINGS
operations. A remote authenticated attacker could use this to expose
or modify sensitive information. This issue only affected Ubuntu
12.04 LTS. (CVE-2012-1012)

Update instructions

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

Ubuntu 12.04

• krb5-admin-server - 1.10+dfsg~beta1-2ubuntu0.3
• krb5-kdc-ldap - 1.10+dfsg~beta1-2ubuntu0.3
• krb5-kdc - 1.10+dfsg~beta1-2ubuntu0.3

Ubuntu 11.10

• krb5-admin-server - 1.9.1+dfsg-1ubuntu2.3
• krb5-kdc-ldap - 1.9.1+dfsg-1ubuntu2.3
• krb5-kdc - 1.9.1+dfsg-1ubuntu2.3

Ubuntu 11.04

• krb5-admin-server - 1.8.3+dfsg-5ubuntu2.3
• krb5-kdc-ldap - 1.8.3+dfsg-5ubuntu2.3
• krb5-kdc - 1.8.3+dfsg-5ubuntu2.3

Ubuntu 10.04

• krb5-admin-server - 1.8.1+dfsg-2ubuntu0.11
• krb5-kdc-ldap - 1.8.1+dfsg-2ubuntu0.11
• krb5-kdc - 1.8.1+dfsg-2ubuntu0.11

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

References

• CVE-2012-1012
• CVE-2012-1013
• CVE-2012-1014
• CVE-2012-1015