Ubuntu 11.04 USN-1139-1 Critical: Bind Denial Of Service Vulnerability

ubuntu

May 30, 2011

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

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)

Topics Covered

security advisory denial of service software update ubuntu severe bind9

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.