Vulnerability identifier: #VU67943

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-2929

CWE-ID: CWE-401

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
DHCP
Server applications / Other server solutions

Vendor: ISC

Description
The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak within the fqdn_universe_decode() function when processing DHCP packets with DNS labels. A remote attacker can send specially crafted DHCP packets to the affected server, trigger memory leak and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

DHCP: 4.4.0 - 4.4.3 b1, 4.3.0 - 4.3.6-P1, 4.2.0 - 4.2.8 rc2, 4.1-esv - 4.1.2-P1, 3.0 - 3.0.7, 2.0 - 2.0.0, 1.0.0, 4.0 - 4.0.3 rc1, 3.1 - 3.1.3

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External links
http://kb.isc.org/docs/cve-2022-2929

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.