=========================================================================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:
  https://ubuntu.com/security/notices/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