==========================================================================
Ubuntu Security Notice USN-2310-1
August 11, 2014

krb5 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 14.04 LTS
– Ubuntu 12.04 LTS
– Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in Kerberos.

Software Description:
– 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 LTS:
krb5-admin-server 1.12+dfsg-2ubuntu4.2
krb5-kdc 1.12+dfsg-2ubuntu4.2
krb5-kdc-ldap 1.12+dfsg-2ubuntu4.2
krb5-otp 1.12+dfsg-2ubuntu4.2
krb5-pkinit 1.12+dfsg-2ubuntu4.2
krb5-user 1.12+dfsg-2ubuntu4.2
libgssapi-krb5-2 1.12+dfsg-2ubuntu4.2
libgssrpc4 1.12+dfsg-2ubuntu4.2
libk5crypto3 1.12+dfsg-2ubuntu4.2
libkadm5clnt-mit9 1.12+dfsg-2ubuntu4.2
libkadm5srv-mit9 1.12+dfsg-2ubuntu4.2
libkdb5-7 1.12+dfsg-2ubuntu4.2
libkrad0 1.12+dfsg-2ubuntu4.2
libkrb5-3 1.12+dfsg-2ubuntu4.2
libkrb5support0 1.12+dfsg-2ubuntu4.2

Ubuntu 12.04 LTS:
krb5-admin-server 1.10+dfsg~beta1-2ubuntu0.5
krb5-kdc 1.10+dfsg~beta1-2ubuntu0.5
krb5-kdc-ldap 1.10+dfsg~beta1-2ubuntu0.5
krb5-pkinit 1.10+dfsg~beta1-2ubuntu0.5
krb5-user 1.10+dfsg~beta1-2ubuntu0.5
libgssapi-krb5-2 1.10+dfsg~beta1-2ubuntu0.5
libgssrpc4 1.10+dfsg~beta1-2ubuntu0.5
libk5crypto3 1.10+dfsg~beta1-2ubuntu0.5
libkadm5clnt-mit8 1.10+dfsg~beta1-2ubuntu0.5
libkadm5srv-mit8 1.10+dfsg~beta1-2ubuntu0.5
libkdb5-6 1.10+dfsg~beta1-2ubuntu0.5
libkrb5-3 1.10+dfsg~beta1-2ubuntu0.5
libkrb5support0 1.10+dfsg~beta1-2ubuntu0.5

Ubuntu 10.04 LTS:
krb5-admin-server 1.8.1+dfsg-2ubuntu0.13
krb5-kdc 1.8.1+dfsg-2ubuntu0.13
krb5-kdc-ldap 1.8.1+dfsg-2ubuntu0.13
krb5-pkinit 1.8.1+dfsg-2ubuntu0.13
krb5-user 1.8.1+dfsg-2ubuntu0.13
libgssapi-krb5-2 1.8.1+dfsg-2ubuntu0.13
libgssrpc4 1.8.1+dfsg-2ubuntu0.13
libk5crypto3 1.8.1+dfsg-2ubuntu0.13
libkadm5clnt-mit7 1.8.1+dfsg-2ubuntu0.13
libkadm5srv-mit7 1.8.1+dfsg-2ubuntu0.13
libkdb5-4 1.8.1+dfsg-2ubuntu0.13
libkrb5-3 1.8.1+dfsg-2ubuntu0.13
libkrb5support0 1.8.1+dfsg-2ubuntu0.13

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

References:
http://www.ubuntu.com/usn/usn-2310-1
CVE-2012-1016, CVE-2013-1415, CVE-2013-1416, CVE-2013-1418,
CVE-2013-6800, CVE-2014-4341, CVE-2014-4342, CVE-2014-4343,
CVE-2014-4344, CVE-2014-4345

Package Information:
https://launchpad.net/ubuntu/+source/krb5/1.12+dfsg-2ubuntu4.2
https://launchpad.net/ubuntu/+source/krb5/1.10+dfsg~beta1-2ubuntu0.5
https://launchpad.net/ubuntu/+source/krb5/1.8.1+dfsg-2ubuntu0.13

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