Vulnerability identifier: #VU32138

Vulnerability risk: Medium

CVSSv3.1:

CVE-ID: CVE-2016-2120

CWE-ID: CWE-190

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS
Server applications / DNS servers

Vendor: PowerDNS.COM B.V.

Description

The vulnerability allows a remote authenticated user to perform a denial of service (DoS) attack.

An issue has been found in PowerDNS Authoritative Server versions up to and including 3.4.10, 4.0.1 allowing an authorized user to crash the server by inserting a specially crafted record in a zone under their control then sending a DNS query for that record. The issue is due to an integer overflow when checking if the content of the record matches the expected size, allowing an attacker to cause a read past the buffer boundary.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PowerDNS: 3.4.0 - 3.4.10

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CPE

• cpe:2.3:a:powerdns_com_b_v:powerdns:3.4.0:*:*:*:*:*:*:*

External links
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2120
http://www.debian.org/security/2017/dsa-3764

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?