Debian DLA-627-1 : pdns security update

High Nessus Plugin ID 93567


The remote Debian host is missing a security update.


Multiple vulnerabilities have been discovered in pdns, an authoritative DNS server. The Common Vulnerabilities and Exposures project identifies the following problems :

CVE-2016-5426 / CVE-2016-5427

Florian Heinz and Martin Kluge reported that the PowerDNS Authoritative Server accepts queries with a qname's length larger than 255 bytes and does not properly handle dot inside labels. A remote, unauthenticated attacker can take advantage of these flaws to cause abnormal load on the PowerDNS backend by sending specially crafted DNS queries, potentially leading to a denial of service.


It was reported that a malicious primary DNS server can crash a secondary PowerDNS server due to improper restriction of zone size limits. This update adds a feature to limit AXFR sizes in response to this flaw.

For Debian 7 'Wheezy', these problems have been fixed in version 3.1-4.1+deb7u2.

We recommend that you upgrade your pdns packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade the affected packages.

See Also

Plugin Details

Severity: High

ID: 93567

File Name: debian_DLA-627.nasl

Version: 2.5

Type: local

Agent: unix

Published: 2016/09/19

Updated: 2018/07/09

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:pdns-backend-geo, p-cpe:/a:debian:debian_linux:pdns-backend-ldap, p-cpe:/a:debian:debian_linux:pdns-backend-lua, p-cpe:/a:debian:debian_linux:pdns-backend-mysql, p-cpe:/a:debian:debian_linux:pdns-backend-pgsql, p-cpe:/a:debian:debian_linux:pdns-backend-pipe, p-cpe:/a:debian:debian_linux:pdns-backend-sqlite, p-cpe:/a:debian:debian_linux:pdns-backend-sqlite3, p-cpe:/a:debian:debian_linux:pdns-server, p-cpe:/a:debian:debian_linux:pdns-server-dbg, cpe:/o:debian:debian_linux:7.0

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/09/18

Reference Information

CVE: CVE-2016-5426, CVE-2016-5427, CVE-2016-6172