USN-2810-1: Kerberos vulnerabilities

Ubuntu Security Notice USN-2810-1

12th November, 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 version:

Ubuntu 15.10:

libk5crypto3 1.13.2+dfsg-2ubuntu0.1

krb5-k5tls 1.13.2+dfsg-2ubuntu0.1

libkrad0 1.13.2+dfsg-2ubuntu0.1

krb5-otp 1.13.2+dfsg-2ubuntu0.1

krb5-pkinit 1.13.2+dfsg-2ubuntu0.1

libkadm5clnt-mit9 1.13.2+dfsg-2ubuntu0.1

krb5-admin-server 1.13.2+dfsg-2ubuntu0.1

libkrb5-3 1.13.2+dfsg-2ubuntu0.1

krb5-kdc-ldap 1.13.2+dfsg-2ubuntu0.1

krb5-user 1.13.2+dfsg-2ubuntu0.1

krb5-kdc 1.13.2+dfsg-2ubuntu0.1

libgssrpc4 1.13.2+dfsg-2ubuntu0.1

libkrb5support0 1.13.2+dfsg-2ubuntu0.1

libgssapi-krb5-2 1.13.2+dfsg-2ubuntu0.1

libkdb5-8 1.13.2+dfsg-2ubuntu0.1

Ubuntu 15.04:

libk5crypto3 1.12.1+dfsg-18ubuntu0.1

krb5-kdc-ldap 1.12.1+dfsg-18ubuntu0.1

libkrad0 1.12.1+dfsg-18ubuntu0.1

krb5-otp 1.12.1+dfsg-18ubuntu0.1

libkdb5-7 1.12.1+dfsg-18ubuntu0.1

krb5-pkinit 1.12.1+dfsg-18ubuntu0.1

libkadm5clnt-mit9 1.12.1+dfsg-18ubuntu0.1

libkrb5-3 1.12.1+dfsg-18ubuntu0.1

krb5-user 1.12.1+dfsg-18ubuntu0.1

krb5-kdc 1.12.1+dfsg-18ubuntu0.1

libgssrpc4 1.12.1+dfsg-18ubuntu0.1

libkrb5support0 1.12.1+dfsg-18ubuntu0.1

libgssapi-krb5-2 1.12.1+dfsg-18ubuntu0.1

krb5-admin-server 1.12.1+dfsg-18ubuntu0.1

Ubuntu 14.04 LTS:

libk5crypto3 1.12+dfsg-2ubuntu5.2

krb5-kdc-ldap 1.12+dfsg-2ubuntu5.2

libkrad0 1.12+dfsg-2ubuntu5.2

krb5-otp 1.12+dfsg-2ubuntu5.2

libkdb5-7 1.12+dfsg-2ubuntu5.2

krb5-pkinit 1.12+dfsg-2ubuntu5.2

libkadm5clnt-mit9 1.12+dfsg-2ubuntu5.2

libkrb5-3 1.12+dfsg-2ubuntu5.2

krb5-user 1.12+dfsg-2ubuntu5.2

krb5-kdc 1.12+dfsg-2ubuntu5.2

libgssrpc4 1.12+dfsg-2ubuntu5.2

libkrb5support0 1.12+dfsg-2ubuntu5.2

libgssapi-krb5-2 1.12+dfsg-2ubuntu5.2

krb5-admin-server 1.12+dfsg-2ubuntu5.2

Ubuntu 12.04 LTS:

libk5crypto3 1.10+dfsg~beta1-2ubuntu0.7

krb5-kdc-ldap 1.10+dfsg~beta1-2ubuntu0.7

libkdb5-6 1.10+dfsg~beta1-2ubuntu0.7

libkrb53 1.10+dfsg~beta1-2ubuntu0.7

krb5-pkinit 1.10+dfsg~beta1-2ubuntu0.7

libkadm5clnt-mit8 1.10+dfsg~beta1-2ubuntu0.7

libkrb5-3 1.10+dfsg~beta1-2ubuntu0.7

krb5-user 1.10+dfsg~beta1-2ubuntu0.7

krb5-kdc 1.10+dfsg~beta1-2ubuntu0.7

libgssrpc4 1.10+dfsg~beta1-2ubuntu0.7

libkrb5support0 1.10+dfsg~beta1-2ubuntu0.7

libgssapi-krb5-2 1.10+dfsg~beta1-2ubuntu0.7

krb5-admin-server 1.10+dfsg~beta1-2ubuntu0.7

To update your system, please follow these instructions: http://ift.tt/17VXqjU.

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

References

CVE-2002-2443, CVE-2014-5355, CVE-2015-2694, CVE-2015-2695, CVE-2015-2696, CVE-2015-2697, CVE-2015-2698

from Ubuntu Security Notices http://ift.tt/1iXsFmz