#VU32241 Buffer overflow in Xen - CVE-2016-7094

Vulnerability identifier: #VU32241

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2016-7094

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local privileged user to perform a denial of service (DoS) attack.

Buffer overflow in Xen 4.7.x and earlier allows local x86 HVM guest OS administrators on guests running with shadow paging to cause a denial of service via a pagetable update.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

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External links
https://support.citrix.com/article/CTX216071
https://www.debian.org/security/2016/dsa-3663
https://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
https://www.securityfocus.com/bid/92864
https://www.securitytracker.com/id/1036753
https://xenbits.xen.org/xsa/advisory-187.html
https://xenbits.xen.org/xsa/xsa187-0001-x86-shadow-Avoid-overflowing-sh_ctxt-seg_reg.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.