Remote code execution in NetBSD PPPoE client

1) Buffer overflow

EUVDB-ID: #VU62920

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-29867

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in PPPoE client when handling responses to broadcasts discovery packets. A remote attacker who controls server on the same network can send a specially crafted response to the affected PPPoE client, trigger memory corruption and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetBSD: 8.2 - 9.2

External links

http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2022-001.txt.asc

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.