#VU32260 Improper access control in Xen - CVE-2016-6258

Vulnerability identifier: #VU32260

Vulnerability risk: Low

CVSSv4.0: 7.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear]

CVE-ID: CVE-2016-6258

CWE-ID: CWE-284

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

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External links
https://support.citrix.com/article/CTX214954
https://www.debian.org/security/2016/dsa-3633
https://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
https://www.securityfocus.com/bid/92131
https://www.securitytracker.com/id/1036446
https://xenbits.xen.org/xsa/advisory-182.html
https://xenbits.xen.org/xsa/xsa182-4.5.patch
https://xenbits.xen.org/xsa/xsa182-4.6.patch
https://xenbits.xen.org/xsa/xsa182-unstable.patch
https://security.gentoo.org/glsa/201611-09

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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.