Vulnerability identifier: #VU47125

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-24697

CWE-ID: CWE-20

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 perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input when pressing queries with a GSS-TSIG signature. A remote attacker can pass specially crafted DNS query to the application and perform a denial of service (DoS) attack.

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.