Multiple vulnerabilities in ISC DHCP

Published: 2022-10-05

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2022-2928 CVE-2022-2929
CWE-ID	CWE-20 CWE-401
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	DHCP Server applications / Other server solutions
Vendor	ISC

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU67944

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 - Improper input validation

Exploit availability: No

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: 2.0 - 4.4.3 b1

External links

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

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.

2) Memory leak

EUVDB-ID: #VU67943

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 - Missing release of memory after effective lifetime