Information disclosure in Xen

1) Information disclosure

EUVDB-ID: #VU32193

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-2016-9932

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local authenticated user to gain access to sensitive information.

CMPXCHG8B emulation in Xen 3.3.x through 4.7.x on x86 systems allows local HVM guest OS users to obtain sensitive information from host stack memory via a "supposedly-ignored" operand size prefix.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 3.3.0 - 3.3.2

CPE2.3

• cpe:2.3:a:xen_project:xen:3.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:3.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:3.3.2:*:*:*:*:*:*:*

External links

http://www.debian.org/security/2017/dsa-3847
http://www.securityfocus.com/bid/94863
http://www.securitytracker.com/id/1037468
http://xenbits.xen.org/xsa/advisory-200.html
http://security.gentoo.org/glsa/201612-56
http://support.citrix.com/article/CTX219378

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.