Information disclosure in Xen - CVE-2016-3158
Published: April 13, 2016 / Updated: July 28, 2020
Vulnerability identifier: #VU32301
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2016-3158
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Xen
Xen
Software vendor:
Xen Project
Xen Project
Description
The vulnerability allows a local authenticated user to gain access to sensitive information.
The xrstor function in arch/x86/xstate.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits. NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.
Remediation
Install update from vendor's website.
External links
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html
- http://support.citrix.com/article/CTX209443
- http://www.debian.org/security/2016/dsa-3554
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://www.securityfocus.com/bid/85714
- http://www.securitytracker.com/id/1035435
- http://xenbits.xen.org/xsa/advisory-172.html
- http://xenbits.xen.org/xsa/xsa172.patch
- http://xenbits.xen.org/xsa/xsa172-4.3.patch