[USN-2810-1] Kerberos vulnerabilities

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-2810-1
November 12, 2015

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

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

- Ubuntu 15.10
- Ubuntu 15.04
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in Kerberos.

Software Description:
- krb5: MIT Kerberos Network Authentication Protocol

Details:

It was discovered that the Kerberos kpasswd service incorrectly handled
certain UDP packets. A remote attacker could possibly use this issue to
cause resource consumption, resulting in a denial of service. This issue
only affected Ubuntu 12.04 LTS. (CVE-2002-2443)

It was discovered that Kerberos incorrectly handled null bytes in certain
data fields. A remote attacker could possibly use this issue to cause a
denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu
14.04 LTS. (CVE-2014-5355)

It was discovered that the Kerberos kdcpreauth modules incorrectly tracked
certain client requests. A remote attacker could possibly use this issue
to bypass intended preauthentication requirements. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-2694)

It was discovered that Kerberos incorrectly handled certain SPNEGO packets.
A remote attacker could possibly use this issue to cause a denial of
service. (CVE-2015-2695)

It was discovered that Kerberos incorrectly handled certain IAKERB packets.
A remote attacker could possibly use this issue to cause a denial of
service. (CVE-2015-2696, CVE-2015-2698)

It was discovered that Kerberos incorrectly handled certain TGS requests. A
remote attacker could possibly use this issue to cause a denial of service.
(CVE-2015-2697)

Update instructions:

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

Ubuntu 15.10:
  krb5-admin-server               1.13.2+dfsg-2ubuntu0.1
  krb5-k5tls                      1.13.2+dfsg-2ubuntu0.1
  krb5-kdc                        1.13.2+dfsg-2ubuntu0.1
  krb5-kdc-ldap                   1.13.2+dfsg-2ubuntu0.1
  krb5-otp                        1.13.2+dfsg-2ubuntu0.1
  krb5-pkinit                     1.13.2+dfsg-2ubuntu0.1
  krb5-user                       1.13.2+dfsg-2ubuntu0.1
  libgssapi-krb5-2                1.13.2+dfsg-2ubuntu0.1
  libgssrpc4                      1.13.2+dfsg-2ubuntu0.1
  libk5crypto3                    1.13.2+dfsg-2ubuntu0.1
  libkadm5clnt-mit9               1.13.2+dfsg-2ubuntu0.1
  libkdb5-8                       1.13.2+dfsg-2ubuntu0.1
  libkrad0                        1.13.2+dfsg-2ubuntu0.1
  libkrb5-3                       1.13.2+dfsg-2ubuntu0.1
  libkrb5support0                 1.13.2+dfsg-2ubuntu0.1

Ubuntu 15.04:
  krb5-admin-server               1.12.1+dfsg-18ubuntu0.1
  krb5-kdc                        1.12.1+dfsg-18ubuntu0.1
  krb5-kdc-ldap                   1.12.1+dfsg-18ubuntu0.1
  krb5-otp                        1.12.1+dfsg-18ubuntu0.1
  krb5-pkinit                     1.12.1+dfsg-18ubuntu0.1
  krb5-user                       1.12.1+dfsg-18ubuntu0.1
  libgssapi-krb5-2                1.12.1+dfsg-18ubuntu0.1
  libgssrpc4                      1.12.1+dfsg-18ubuntu0.1
  libk5crypto3                    1.12.1+dfsg-18ubuntu0.1
  libkadm5clnt-mit9               1.12.1+dfsg-18ubuntu0.1
  libkdb5-7                       1.12.1+dfsg-18ubuntu0.1
  libkrad0                        1.12.1+dfsg-18ubuntu0.1
  libkrb5-3                       1.12.1+dfsg-18ubuntu0.1
  libkrb5support0                 1.12.1+dfsg-18ubuntu0.1

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

Ubuntu 12.04 LTS:
  krb5-admin-server               1.10+dfsg~beta1-2ubuntu0.7
  krb5-kdc                        1.10+dfsg~beta1-2ubuntu0.7
  krb5-kdc-ldap                   1.10+dfsg~beta1-2ubuntu0.7
  krb5-pkinit                     1.10+dfsg~beta1-2ubuntu0.7
  krb5-user                       1.10+dfsg~beta1-2ubuntu0.7
  libgssapi-krb5-2                1.10+dfsg~beta1-2ubuntu0.7
  libgssrpc4                      1.10+dfsg~beta1-2ubuntu0.7
  libk5crypto3                    1.10+dfsg~beta1-2ubuntu0.7
  libkadm5clnt-mit8               1.10+dfsg~beta1-2ubuntu0.7
  libkdb5-6                       1.10+dfsg~beta1-2ubuntu0.7
  libkrb5-3                       1.10+dfsg~beta1-2ubuntu0.7
  libkrb53                        1.10+dfsg~beta1-2ubuntu0.7
  libkrb5support0                 1.10+dfsg~beta1-2ubuntu0.7

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

References:
  http://www.ubuntu.com/usn/usn-2810-1
  CVE-2002-2443, CVE-2014-5355, CVE-2015-2694, CVE-2015-2695,
  CVE-2015-2696, CVE-2015-2697, CVE-2015-2698

Package Information:
  https://launchpad.net/ubuntu/+source/krb5/1.13.2+dfsg-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/krb5/1.12.1+dfsg-18ubuntu0.1
  https://launchpad.net/ubuntu/+source/krb5/1.12+dfsg-2ubuntu5.2
  https://launchpad.net/ubuntu/+source/krb5/1.10+dfsg~beta1-2ubuntu0.7


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