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Ubuntu Security Notice USN-1139-1
May 30, 2011

bind9 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

An attacker could send crafted input to Bind and cause it to crash.

Software Description:
- bind9: Internet Domain Name Server

Details:

It was discovered that Bind incorrectly handled certain bad signatures if
multiple trust anchors existed for a single zone. A remote attacker could
use this flaw to cause Bind to stop responding, resulting in a denial of
service. This issue only affected Ubuntu 8.04 LTS and 10.04 LTS.
(CVE-2010-3762)

Frank Kloeker and Michael Sinatra discovered that Bind incorrectly handled
certain very large RRSIG RRsets included in negative responses. A remote
attacker could use this flaw to cause Bind to stop responding, resulting in
a denial of service. (CVE-2011-1910)

Update instructions:

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

Ubuntu 11.04:
  libdns69                        1:9.7.3.dfsg-1ubuntu2.1

Ubuntu 10.10:
  libdns66                        1:9.7.1.dfsg.P2-2ubuntu0.3

Ubuntu 10.04 LTS:
  libdns64                        1:9.7.0.dfsg.P1-1ubuntu0.2

Ubuntu 8.04 LTS:
  libdns36                        1:9.4.2.dfsg.P2-2ubuntu0.7

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

References:
  CVE-2010-3762, CVE-2011-1910

Package Information:
  https://launchpad.net/ubuntu/+source/bind9/1:9.7.3.dfsg-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/bind9/1:9.7.1.dfsg.P2-2ubuntu0.3
  https://launchpad.net/ubuntu/+source/bind9/1:9.7.0.dfsg.P1-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/bind9/1:9.4.2.dfsg.P2-2ubuntu0.7