Improper input validation in NetBSD

1) Improper input validation

EUVDB-ID: #VU8451

Risk: Low

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

CVE-ID: N/A

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges or cause denial of service on the target system.

The weakness exists due to improper handling of openat() system calls using a file descriptor that does not name a directory as the starting point for a path lookup. A local attacker can make a specially crafted openat() system calls, trigger a vnode reference leak in the kernel and gain elevated privileges or cause a DoS condition.

Mitigation

Install update from vendor's website.

Vulnerable software versions

NetBSD: 7.0 - 8.0

External links

http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2017-006.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.