Vulnerability identifier: #VU67944

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-2928

CWE-ID: CWE-20

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 a denial of service (DoS) attack.

The vulnerability exists due to an error related to the way processing lease queries are processed by the DHCP server. With a DHCP server configured with "allow leasequery;" a remote attacker can send lease queries for the same lease multiple times, leading to the "add_option()" function being repeatedly called. This can cause an option's "refcount" field to overflow and the server to abort.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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

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External links
http://kb.isc.org/docs/cve-2022-2928

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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.