==========================================================================
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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