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Vulnerability of Arm Cortex Processors: information disclosure via Straight Line Speculation

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via Straight Line Speculation of Arm Cortex Processors, in order to obtain sensitive information.
Vulnerable products: FreeBSD, GCC, Linux, OpenBSD.
Severity of this weakness: 1/4.
Creation date: 17/06/2020.
Références of this bulletin: CVE-2020-13844, VIGILANCE-VUL-32550.

Description of the vulnerability 

An attacker can bypass access restrictions to data via Straight Line Speculation of Arm Cortex Processors, in order to obtain sensitive information.
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This computer vulnerability announce impacts software or systems such as FreeBSD, GCC, Linux, OpenBSD.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin is low.

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 threat alert.

Solutions for this threat 

FreeBSD: patch for Arm Straight Line Speculation.
A patch is indicated in information sources.

GCC: patch for Arm Straight Line Speculation.
A patch is indicated in information sources.

Linux kernel: patch for Arm Straight Line Speculation.
A patch is indicated in information sources.

OpenBSD: patch for ARM64.
A patch is available:
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/025_eret.patch.sig
  https://ftp.openbsd.org/pub/OpenBSD/patches/6.6/common/014_eret.patch.sig
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