#VU32140 Input validation error in PowerDNS - CVE-2016-7074

Vulnerability identifier: #VU32140

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-7074

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS
Server applications / DNS servers

Vendor: PowerDNS.COM B.V.

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

An issue has been found in PowerDNS before 3.4.11 and 4.0.2, and PowerDNS recursor before 4.0.4, allowing an attacker in position of man-in-the-middle to alter the content of an AXFR because of insufficient validation of TSIG signatures. A missing check that the TSIG record is the last one, leading to the possibility of parsing records that are not covered by the TSIG signature.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PowerDNS: 3.4.0 - 3.4.10

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-7074
https://doc.powerdns.com/md/security/powerdns-advisory-2016-04/
https://www.debian.org/security/2017/dsa-3764

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.