Debian DSA-2208-1 : bind9 - denial of service

high Nessus Plugin ID 53224


The remote Debian host is missing a security-related update.


It was discovered that BIND, a DNS server, contains a race condition when processing zones updates in an authoritative server, either through dynamic DNS updates or incremental zone transfer (IXFR). Such an update while processing a query could result in deadlock and denial of service. (CVE-2011-0414 )

In addition, this security update addresses a defect related to the processing of new DNSSEC DS records by the caching resolver, which may lead to name resolution failures in the delegated zone. If DNSSEC validation is enabled, this issue can make domains ending in .COM unavailable when the DS record for .COM is added to the DNS root zone on March 31st, 2011. An unpatched server which is affected by this issue can be restarted, thus re-enabling resolution of .COM domains.
This workaround applies to the version in oldstable, too.

Configurations not using DNSSEC validations are not affected by this second issue.


Upgrade the bind9 packages.

For the oldstable distribution (lenny), the DS record issue has been fixed in version 1:9.6.ESV.R4+dfsg-0+lenny1. (CVE-2011-0414 does not affect the lenny version.)

For the stable distribution (squeeze), this problem has been fixed in version 1:9.7.3.dfsg-1~squeeze1.

See Also

Plugin Details

Severity: High

ID: 53224

File Name: debian_DSA-2208.nasl

Version: 1.15

Type: local

Agent: unix

Published: 3/31/2011

Updated: 1/4/2021

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: High

Base Score: 7.1

Temporal Score: 5.9

Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C

Temporal Vector: E:F/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:bind9, cpe:/o:debian:debian_linux:5.0, cpe:/o:debian:debian_linux:6.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/30/2011

Reference Information

CVE: CVE-2011-0414

BID: 46491

DSA: 2208