Vulnerability identifier: #VU47126

Vulnerability risk: Medium

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-24698

CWE-ID: CWE-415

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS Authoritative
Server applications / DNS servers

Vendor: PowerDNS.COM B.V.

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing queries with a GSS-TSIG signature. A remote attacker can pass specially crafted DNS query to the application, trigger double free error and execute arbitrary code on the target system.

Successful exploitation of the vulnerability requires that the application is compiled with –enable-experimental-gss-tsig flag.

Mitigation
Install update from vendor's website.

Vulnerable software versions

PowerDNS Authoritative: 4.3.0 - 4.3.1, 4.2.0 - 4.2.3, 4.1.0 - 4.1.14, 4.0.0 - 4.0.9

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External links
http://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-2020-06.html

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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.