Spoofing attack in NetBSD utmp_update

1) Spoofing attack

EUVDB-ID: #VU87316

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

Exploit availability: No

Description

The vulnerability allows a local user to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data within the utmp_update(8) command when handling hostnames. A local user can inject specially crafted data into the utmpx(5) database and spoof content of log files or display arbitrary output for tools, which display hostnames from utmpx(5) databases such us w(1) or who(1).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

NetBSD: 8.0 - 10

External links

http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2024-001.txt.asc

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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