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Vulnerability of OpenBSD: denial of service via MPLS

Synthesis of the vulnerability 

An attacker can send malicious MPLS packets to OpenBSD, in order to trigger a denial of service.
Vulnerable software: OpenBSD.
Severity of this announce: 3/4.
Creation date: 11/12/2017.
Références of this computer vulnerability: VIGILANCE-VUL-24721.

Description of the vulnerability 

The OpenBSD product has a service to manage received MPLS packets.

However, when malicious MPLS packets are received, a fatal error occurs.

An attacker can therefore send malicious MPLS packets to OpenBSD, in order to trigger a denial of service.
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This cybersecurity bulletin impacts software or systems such as OpenBSD.

Our Vigil@nce team determined that the severity of this cybersecurity weakness is important.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this computer vulnerability bulletin.

Solutions for this threat 

OpenBSD: patch for MPLS.
A patch is available:
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.1/common/033_mpls.patch.sig
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.2/common/003_mpls.patch.sig
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