SB2016041313 - Information disclosure in Xen
Published: April 13, 2016 Updated: July 28, 2020
Security Bulletin ID
SB2016041313
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Information disclosure (CVE-ID: CVE-2016-3158)
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.
References
- 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