Information disclosure in Xen

1) Information disclosure

EUVDB-ID: #VU32193

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-9932

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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

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