USN-2310-1: Kerberos vulnerabilities

11 August 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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References