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Vigil@nce - FreeBSD: denial of service via TCP MD5

March 2016 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

A local (remote in some special configurations) attacker can send
a malicious TCP packet to FreeBSD, in order to trigger a denial of
service.

Impacted products: FreeBSD.

Severity: 2/4.

Creation date: 14/01/2016.

DESCRIPTION OF THE VULNERABILITY

The FreeBSD kernel (with option TCP_SIGNATURE) implements the RFC
2385, which uses a MD5 signature on TCP packets.

However, when both TCP_NOOPT and TCP_MD5SIG options are active on
a socket, a fatal error occurs.

A local (remote in some special configurations) attacker can
therefore send a malicious TCP packet to FreeBSD, in order to
trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/FreeBSD-denial-of-service-via-TCP-MD5-18726


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