Denial of service in PowerDNS Recursor

1) Infinite loop

EUVDB-ID: #VU71397

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-22617

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

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 processing queries for misconfigured domains. A remote attacker can query a specially crafted or malicious domain and crash the DNS recursor.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

PowerDNS Recursor: 4.8.0

External links

http://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2023-01.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.