Debian DSA-3764-1 : pdns - security update

medium Nessus Plugin ID 96497

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Synopsis

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

Description

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

- CVE-2016-2120 Mathieu Lafon discovered that pdns does not properly validate records in zones. An authorized user can take advantage of this flaw to crash server by inserting a specially crafted record in a zone under their control and then sending a DNS query for that record.

- CVE-2016-7068 Florian Heinz and Martin Kluge reported that pdns parses all records present in a query regardless of whether they are needed or even legitimate, allowing a remote, unauthenticated attacker to cause an abnormal CPU usage load on the pdns server, resulting in a partial denial of service if the system becomes overloaded.

- CVE-2016-7072 Mongo discovered that the webserver in pdns is susceptible to a denial-of-service vulnerability, allowing a remote, unauthenticated attacker to cause a denial of service by opening a large number of TCP connections to the web server.

- CVE-2016-7073 / CVE-2016-7074 Mongo discovered that pdns does not sufficiently validate TSIG signatures, allowing an attacker in position of man-in-the-middle to alter the content of an AXFR.

Solution

Upgrade the pdns packages.

For the stable distribution (jessie), these problems have been fixed in version 3.4.1-4+deb8u7.

Plugin Details

Severity: Medium

ID: 96497

File Name: debian_DSA-3764.nasl

Version: 3.9

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 1/16/2017

Updated: 1/5/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2016-7074

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:pdns, cpe:/o:debian:debian_linux:8.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 1/13/2017

Reference Information

CVE: CVE-2016-2120, CVE-2016-7068, CVE-2016-7072, CVE-2016-7073, CVE-2016-7074

DSA: 3764

Detections

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