Vigil@nce - FreeBSD: use after free via File Descriptor Reference Count Leak
April 2019 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer/Computer-vulnerability-database-and-alert
SYNTHESIS OF THE VULNERABILITY
Impacted products: FreeBSD.
Severity: 2/4.
Consequences: administrator access/rights, privileged
access/rights, denial of service on server.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 06/02/2019.
DESCRIPTION OF THE VULNERABILITY
An attacker can force the usage of a freed memory area via File
Descriptor Reference Count Leak of FreeBSD, in order to trigger a
denial of service, and possibly to run code.
ACCESS TO THE FULL VIGIL@NCE BULLETIN