============================================================================
Ubuntu Security Notice USN-2498-1
February 10, 2015

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

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

- Ubuntu 14.10
- 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 sent old keys in response to a
-randkey -keepold request. An authenticated remote attacker could use this
issue to forge tickets by leveraging administrative access. This issue
only affected Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu 14.04 LTS.
(CVE-2014-5351)

It was discovered that the libgssapi_krb5 library incorrectly processed
security context handles. A remote attacker could use this issue to cause
a denial of service, or possibly execute arbitrary code. (CVE-2014-5352)

Patrik Kis discovered that Kerberos incorrectly handled LDAP queries with
no results. An authenticated remote attacker could use this issue to cause
the KDC to crash, resulting in a denial of service. (CVE-2014-5353)

It was discovered that Kerberos incorrectly handled creating database
entries for a keyless principal when using LDAP. An authenticated remote
attacker could use this issue to cause the KDC to crash, resulting in a
denial of service. (CVE-2014-5354)

It was discovered that Kerberos incorrectly handled memory when processing
XDR data. A remote attacker could use this issue to cause kadmind to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2014-9421)

It was discovered that Kerberos incorrectly handled two-component server
principals. A remote attacker could use this issue to perform impersonation
attacks. (CVE-2014-9422)

It was discovered that the libgssrpc library leaked uninitialized bytes. A
remote attacker could use this issue to possibly obtain sensitive
information. (CVE-2014-9423)

Update instructions:

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

Ubuntu 14.10:
  krb5-admin-server               1.12.1+dfsg-10ubuntu0.1
  krb5-kdc                        1.12.1+dfsg-10ubuntu0.1
  krb5-kdc-ldap                   1.12.1+dfsg-10ubuntu0.1
  krb5-otp                        1.12.1+dfsg-10ubuntu0.1
  krb5-pkinit                     1.12.1+dfsg-10ubuntu0.1
  krb5-user                       1.12.1+dfsg-10ubuntu0.1
  libgssapi-krb5-2                1.12.1+dfsg-10ubuntu0.1
  libgssrpc4                      1.12.1+dfsg-10ubuntu0.1
  libk5crypto3                    1.12.1+dfsg-10ubuntu0.1
  libkadm5clnt-mit9               1.12.1+dfsg-10ubuntu0.1
  libkadm5srv-mit9                1.12.1+dfsg-10ubuntu0.1
  libkdb5-7                       1.12.1+dfsg-10ubuntu0.1
  libkrad0                        1.12.1+dfsg-10ubuntu0.1
  libkrb5-3                       1.12.1+dfsg-10ubuntu0.1
  libkrb5support0                 1.12.1+dfsg-10ubuntu0.1

Ubuntu 14.04 LTS:
  krb5-admin-server               1.12+dfsg-2ubuntu5.1
  krb5-kdc                        1.12+dfsg-2ubuntu5.1
  krb5-kdc-ldap                   1.12+dfsg-2ubuntu5.1
  krb5-otp                        1.12+dfsg-2ubuntu5.1
  krb5-pkinit                     1.12+dfsg-2ubuntu5.1
  krb5-user                       1.12+dfsg-2ubuntu5.1
  libgssapi-krb5-2                1.12+dfsg-2ubuntu5.1
  libgssrpc4                      1.12+dfsg-2ubuntu5.1
  libk5crypto3                    1.12+dfsg-2ubuntu5.1
  libkadm5clnt-mit9               1.12+dfsg-2ubuntu5.1
  libkadm5srv-mit8                1.12+dfsg-2ubuntu5.1
  libkadm5srv-mit9                1.12+dfsg-2ubuntu5.1
  libkdb5-7                       1.12+dfsg-2ubuntu5.1
  libkrad0                        1.12+dfsg-2ubuntu5.1
  libkrb5-3                       1.12+dfsg-2ubuntu5.1
  libkrb5support0                 1.12+dfsg-2ubuntu5.1

Ubuntu 12.04 LTS:
  krb5-admin-server               1.10+dfsg~beta1-2ubuntu0.6
  krb5-kdc                        1.10+dfsg~beta1-2ubuntu0.6
  krb5-kdc-ldap                   1.10+dfsg~beta1-2ubuntu0.6
  krb5-pkinit                     1.10+dfsg~beta1-2ubuntu0.6
  krb5-user                       1.10+dfsg~beta1-2ubuntu0.6
  libgssapi-krb5-2                1.10+dfsg~beta1-2ubuntu0.6
  libgssrpc4                      1.10+dfsg~beta1-2ubuntu0.6
  libk5crypto3                    1.10+dfsg~beta1-2ubuntu0.6
  libkadm5clnt-mit8               1.10+dfsg~beta1-2ubuntu0.6
  libkadm5srv-mit8                1.10+dfsg~beta1-2ubuntu0.6
  libkdb5-6                       1.10+dfsg~beta1-2ubuntu0.6
  libkrb5-3                       1.10+dfsg~beta1-2ubuntu0.6
  libkrb53                        1.10+dfsg~beta1-2ubuntu0.6
  libkrb5support0                 1.10+dfsg~beta1-2ubuntu0.6

Ubuntu 10.04 LTS:
  krb5-admin-server               1.8.1+dfsg-2ubuntu0.14
  krb5-kdc                        1.8.1+dfsg-2ubuntu0.14
  krb5-kdc-ldap                   1.8.1+dfsg-2ubuntu0.14
  krb5-pkinit                     1.8.1+dfsg-2ubuntu0.14
  krb5-user                       1.8.1+dfsg-2ubuntu0.14
  libgssapi-krb5-2                1.8.1+dfsg-2ubuntu0.14
  libgssrpc4                      1.8.1+dfsg-2ubuntu0.14
  libk5crypto3                    1.8.1+dfsg-2ubuntu0.14
  libkadm5clnt-mit7               1.8.1+dfsg-2ubuntu0.14
  libkadm5srv-mit7                1.8.1+dfsg-2ubuntu0.14
  libkdb5-4                       1.8.1+dfsg-2ubuntu0.14
  libkrb5-3                       1.8.1+dfsg-2ubuntu0.14
  libkrb5support0                 1.8.1+dfsg-2ubuntu0.14

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

References:
  https://www.ubuntu.com/usn/usn-2498-1
  CVE-2014-5351, CVE-2014-5352, CVE-2014-5353, CVE-2014-5354,
  CVE-2014-9421, CVE-2014-9422, CVE-2014-9423

Package Information:
  https://launchpad.net/ubuntu/+source/krb5/1.12.1+dfsg-10ubuntu0.1
  https://launchpad.net/ubuntu/+source/krb5/1.12+dfsg-2ubuntu5.1
  https://launchpad.net/ubuntu/+source/krb5/1.10+dfsg~beta1-2ubuntu0.6
  https://launchpad.net/ubuntu/+source/krb5/1.8.1+dfsg-2ubuntu0.14