Vulnerability identifier: #VU7149

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-10916

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description
The vulnerability allows a local attacker to obtain potentially sensitive information on the host system.

The weakness exists due to information leak. A local attacker on guest system that uses the Memory Protection Extensions (MPX) and Protection Key (PKU) features and manually context switch between vCPUs can obtain potentially sensitive control information about guest address space pointers on the target system.

Successful exploitation of the vulnerability results in information disclosure.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.5.0 - 4.8.1

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External links
http://xenbits.xen.org/xsa/advisory-220.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.