Denial of service in PowerDNS Recursor

1) Insufficient verification of data authenticity

EUVDB-ID: #VU74176

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-26437

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

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

The vulnerability exists in the code responsible for protection against spoofing attacks. A remote attacker can send specially crafted DNS queries with spoofed IP address to force the PowerDNS Recursor to mark specific authoritative servers as not available, leading to a denial of service condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PowerDNS Recursor: 4.0.0 - 4.8.3

External links

http://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2023-02.html

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.