ubuntu-security-announce Digest, Vol 85, Issue 9

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Today's Topics:

1. [USN-1232-1] X.Org X server vulnerabilities (Marc Deslauriers)
2. [USN-1233-1] Kerberos Vulnerabilities (Steve Beattie)

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Message: 1
Date: Tue, 18 Oct 2011 12:25:24 -0400
From: Marc Deslauriers <marc.deslauriers@canonical.com>
To: ubuntu-security-announce@lists.ubuntu.com
Subject: [USN-1232-1] X.Org X server vulnerabilities
Message-ID: <1318955124.5781.9.camel@mdlinux>
Content-Type: text/plain; charset="utf-8"

==========================================================================
Ubuntu Security Notice USN-1232-1
October 18, 2011

xorg-server vulnerabilities
==========================================================================

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

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

The X server could be made to crash, run programs as an administrator, or
read arbitrary files.

Software Description:
- xorg-server: X.Org X server

Details:

It was discovered that the X server incorrectly handled certain malformed
input. An authorized attacker could exploit this to cause the X server to
crash, leading to a denial or service, or possibly execute arbitrary code
with root privileges. This issue only affected Ubuntu 10.04 LTS and 10.10.
(CVE-2010-4818)

It was discovered that the X server incorrectly handled certain malformed
input. An authorized attacker could exploit this to cause the X server to
crash, leading to a denial or service, or possibly read arbitrary data from
the X server process. This issue only affected Ubuntu 10.04 LTS.
(CVE-2010-4819)

Vladz discovered that the X server incorrectly handled lock files. A local
attacker could use this flaw to determine if a file existed or not.
(CVE-2011-4028)

Vladz discovered that the X server incorrectly handled setting lock file
permissions. A local attacker could use this flaw to gain read permissions
on arbitrary files and view sensitive information. (CVE-2011-4029)

Update instructions:

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

Ubuntu 11.10:
xserver-xorg-core 2:1.10.4-1ubuntu4.1

Ubuntu 11.04:
xserver-xorg-core 2:1.10.1-1ubuntu1.3

Ubuntu 10.10:
xserver-xorg-core 2:1.9.0-0ubuntu7.5

Ubuntu 10.04 LTS:
xserver-xorg-core 2:1.7.6-2ubuntu7.8

After a standard system update you need to restart your session to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1232-1
CVE-2010-4818, CVE-2010-4819, CVE-2011-4028, CVE-2011-4029

Package Information:
https://launchpad.net/ubuntu/+source/xorg-server/2:1.10.4-1ubuntu4.1
https://launchpad.net/ubuntu/+source/xorg-server/2:1.10.1-1ubuntu1.3
https://launchpad.net/ubuntu/+source/xorg-server/2:1.9.0-0ubuntu7.5
https://launchpad.net/ubuntu/+source/xorg-server/2:1.7.6-2ubuntu7.8

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Message: 2
Date: Tue, 18 Oct 2011 16:47:28 -0700
From: Steve Beattie <sbeattie@ubuntu.com>
To: ubuntu-security-announce@lists.ubuntu.com
Subject: [USN-1233-1] Kerberos Vulnerabilities
Message-ID: <20111018234728.GC5570@nxnw.org>
Content-Type: text/plain; charset="us-ascii"

==========================================================================
Ubuntu Security Notice USN-1233-1
October 18, 2011

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

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

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

Summary:

Several denial of service issues were fixed in the Kerberos Key
Distribution Center (KDC).

Software Description:
- krb5: MIT Kerberos Network Authentication Protocol

Details:

Nalin Dahyabhai, Andrej Ota and Kyle Moffett discovered a NULL
pointer dereference in the KDC LDAP backend. An unauthenticated
remote attacker could use this to cause a denial of service. This
issue affected Ubuntu 11.10. (CVE-2011-1527)

Mark Deneen discovered that an assert() could be triggered in the
krb5_ldap_lockout_audit() function in the KDC LDAP backend and
the krb5_db2_lockout_audit() function in the KDC DB2 backend. An
unauthenticated remote attacker could use this to cause a denial of
service. (CVE-2011-1528)

It was discovered that a NULL pointer dereference could occur in the
lookup_lockout_policy() function in the KDC LDAP and DB2 backends.
An unauthenticated remote attacker could use this to cause a denial of
service. (CVE-2011-1529)

Update instructions:

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

Ubuntu 11.10:
krb5-kdc 1.9.1+dfsg-1ubuntu1.1
krb5-kdc-ldap 1.9.1+dfsg-1ubuntu1.1

Ubuntu 11.04:
krb5-kdc 1.8.3+dfsg-5ubuntu2.2
krb5-kdc-ldap 1.8.3+dfsg-5ubuntu2.2

Ubuntu 10.10:
krb5-kdc 1.8.1+dfsg-5ubuntu0.8
krb5-kdc-ldap 1.8.1+dfsg-5ubuntu0.8

Ubuntu 10.04 LTS:
krb5-kdc 1.8.1+dfsg-2ubuntu0.10
krb5-kdc-ldap 1.8.1+dfsg-2ubuntu0.10

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

References:
http://www.ubuntu.com/usn/usn-1233-1
CVE-2011-1527, CVE-2011-1528, CVE-2011-1529

Package Information:
https://launchpad.net/ubuntu/+source/krb5/1.9.1+dfsg-1ubuntu1.1
https://launchpad.net/ubuntu/+source/krb5/1.8.3+dfsg-5ubuntu2.2
https://launchpad.net/ubuntu/+source/krb5/1.8.1+dfsg-5ubuntu0.8
https://launchpad.net/ubuntu/+source/krb5/1.8.1+dfsg-2ubuntu0.10

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