#VU66715 Improper Handling of Exceptional Conditions in PowerDNS Recursor - CVE-2022-37428

Vulnerability identifier: #VU66715

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-37428

CWE-ID: CWE-755

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS Recursor
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 incorrect exceptions handling with enabled protobuf logging. A remote attacker can send a specially crafted request to the DNS server and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PowerDNS Recursor: 4.0.0 rc1 - 4.0.9, 4.1.0 rc1 - 4.1.18, 4.2.0 alpha1 - 4.2.5, 4.3.0 rc1 - 4.3.7, 4.4.0 alpha1 - 4.4.8, 4.5.0 rc1 - 4.5.9, 4.6.0 rc1 - 4.6.2, 4.7.0 alpha1 - 4.7.1

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External links
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2022-02.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.