Amazon Linux AMI : bind Denial of Service (ALAS-2011-24)

This script is Copyright (C) 2013 Tenable Network Security, Inc.


Synopsis :

The remote Amazon Linux AMI host is missing a security update.

Description :

Package updates are available for Amazon Linux AMI that fix the
following vulnerabilities :

The Berkeley Internet Name Domain (BIND) is an implementation of the
Domain Name System (DNS) protocols. BIND includes a DNS server
(named)
a resolver library (routines for applications to use when
interfacing with DNS)
and tools for verifying that the DNS server is
operating correctly.

A flaw was discovered in the way BIND handled certain DNS queries,
which caused it to cache an invalid record. A remote attacker could
use this flaw to send repeated queries for this invalid record,
causing the resolvers to exit unexpectedly due to a failed assertion.

From CVE-2011-4313 :

query.c in ISC BIND 9.0.x through 9.6.x, 9.4-ESV through 9.4-ESV-R5,
9.6-ESV through 9.6-ESV-R5, 9.7.0 through 9.7.4, 9.8.0 through 9.8.1,
and 9.9.0a1 through 9.9.0b1 allows remote attackers to cause a denial
of service (assertion failure and named exit) via unknown vectors
related to recursive DNS queries, error logging, and the caching of an
invalid record by the resolver.

See also :

http://www.nessus.org/u?ca5c632a

Solution :

Run 'yum upgrade bind*' to upgrade your system. After installing the
update, the bind daemon (named) will restart automatically.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)

Family: Amazon Linux Local Security Checks

Nessus Plugin ID: 69583 ()

Bugtraq ID:

CVE ID: CVE-2011-4313