Debian DSA-1963-1 : unbound - cryptographic implementation error

high Nessus Plugin ID 44828



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


It was discovered that Unbound, a DNS resolver, does not properly check cryptographic signatures on NSEC3 records. As a result, zones signed with the NSEC3 variant of DNSSEC lose their cryptographic protection. (An attacker would still have to carry out an ordinary cache poisoning attack to add bad data to the cache.)


Upgrade the unbound package.

The old stable distribution (etch) does not contain an unbound package.

For the stable distribution (lenny), this problem has been fixed in version 1.0.2-1+lenny1.

See Also

Plugin Details

Severity: High

ID: 44828

File Name: debian_DSA-1963.nasl

Version: 1.9

Type: local

Agent: unix

Published: 2/24/2010

Updated: 1/4/2021

Supported Sensors: Frictionless Assessment Agent, Nessus Agent

Risk Information


Risk Factor: Low

Score: 3.4


Risk Factor: High

Base Score: 7.5

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

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

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

Patch Publication Date: 12/23/2009

Reference Information

CVE: CVE-2009-3602

DSA: 1963

CWE: 310