Input validation error in PowerDNS

1) Input validation error

EUVDB-ID: #VU32140

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 - Improper input validation

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:powerdns_com_b_v:powerdns:3.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:powerdns:3.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:powerdns:3.4.2:*:*:*:*:*:*:*

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

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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