USN-1233-1: Kerberos Vulnerabilities

Releases

• Ubuntu 11.10
• Ubuntu 11.04
• Ubuntu 10.10
• Ubuntu 10.04

Packages

• krb5 - MIT Kerberos Network Authentication Protocol

Details

Nalin Dahyabhai, Andrej Ota and Kyle Moffett discovered a NULL
pointer dereference in the KDC LDAP backend. An unauthenticated
remote attacker could use this to cause a denial of service. This
issue affected Ubuntu 11.10. (CVE-2011-1527)

Mark Deneen discovered that an assert() could be triggered in the
krb5_ldap_lockout_audit() function in the KDC LDAP backend and
the krb5_db2_lockout_audit() function in the KDC DB2 backend. An
unauthenticated remote attacker could use this to cause a denial of
service. (CVE-2011-1528)

It was discovered that a NULL pointer dereference could occur in the
lookup_lockout_policy() function in the KDC LDAP and DB2 backends.
An unauthenticated remote attacker could use this to cause a denial of
service. (CVE-2011-1529)

Update instructions

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

Ubuntu 11.10

• krb5-kdc-ldap - 1.9.1+dfsg-1ubuntu1.1
• krb5-kdc - 1.9.1+dfsg-1ubuntu1.1

Ubuntu 11.04

• krb5-kdc-ldap - 1.8.3+dfsg-5ubuntu2.2
• krb5-kdc - 1.8.3+dfsg-5ubuntu2.2

Ubuntu 10.10

• krb5-kdc-ldap - 1.8.1+dfsg-5ubuntu0.8
• krb5-kdc - 1.8.1+dfsg-5ubuntu0.8

Ubuntu 10.04

• krb5-kdc-ldap - 1.8.1+dfsg-2ubuntu0.10
• krb5-kdc - 1.8.1+dfsg-2ubuntu0.10

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

References

• CVE-2011-1527
• CVE-2011-1528
• CVE-2011-1529