Denial of service in OpenBSD

1) Improper input validation

EUVDB-ID: #VU9748

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/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 remote attacker to cause DoS condition on the target system.

The weakness exists due to insufficient validation of user-supplied data. A remote attacker can send specially crafted MPLS data and cause the target kernel to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation

Install update from vendor's website.

Vulnerable software versions

OpenBSD: 6.1 - 6.2

External links

http://ftp.openbsd.org/pub/OpenBSD/patches/6.1/common/033_mpls.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/6.2/common/003_mpls.patch.sig

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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