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Vulnerability of FreeBSD: use after free via UNIX-Domain Socket Rights Transmission

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via UNIX-Domain Socket Rights Transmission of FreeBSD, in order to trigger a denial of service, and possibly to run code.
Impacted systems: FreeBSD, pfSense.
Severity of this alert: 2/4.
Creation date: 25/07/2019.
Références of this alert: CVE-2019-5607, FreeBSD-SA-19:17.fd, VIGILANCE-VUL-29879.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via UNIX-Domain Socket Rights Transmission of FreeBSD, in order to trigger a denial of service, and possibly to run code.
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This computer weakness alert impacts software or systems such as FreeBSD, pfSense.

Our Vigil@nce team determined that the severity of this weakness note is medium.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this weakness bulletin.

Solutions for this threat 

FreeBSD: patch for UNIX-Domain Socket Rights Transmission.
A patch is available:
  FreeBSD 11.2: https://security.FreeBSD.org/patches/SA-19:17/fd.11.2.patch
  FreeBSD 11.3: https://security.FreeBSD.org/patches/SA-19:17/fd.11.patch
  FreeBSD 12.0: https://security.FreeBSD.org/patches/SA-19:17/fd.12.patch

pfSense: version 2.4.5.
The version 2.4.5 is fixed:
  https://www.netgate.com/solutions/pfsense/
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