#VU32427 Input validation error in Xen - CVE-2015-0268

Vulnerability identifier: #VU32427

Vulnerability risk: Low

CVSSv4.0: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-0268

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows a local non-authenticated attacker to perform a denial of service (DoS) attack.

The vgic_v2_to_sgi function in arch/arm/vgic-v2.c in Xen 4.5.x, when running on ARM hardware with general interrupt controller (GIC) version 2, allows local guest users to cause a denial of service (host crash) by writing an invalid value to the GICD.SGIR register.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.24

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External links
https://www.securityfocus.com/bid/72591
https://www.securitytracker.com/id/1031746
https://xenbits.xen.org/xsa/advisory-117.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/100868

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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.