PT-2015-2746 · Xen · Xen

Julien Grall · Published 2015-11-17 · Updated 2018-10-30 · CVE-2015-7812

Positive Technologies (AI Summary)

CVSS v2.0

4.9

Medium

Base vector

AV:L/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Xen versions 4.4.x through 4.6.x

Description The issue is related to the hypercall create continuation function in arch/arm/domain.c, which allows local guest users to cause a denial of service (host crash) via a preemptible hypercall to the multicall interface. This is due to errors in security settings. An attacker can exploit this issue to cause a denial of service with a special hypercall.

Recommendations For Xen versions 4.4.x through 4.6.x, consider disabling the hypercall create continuation function as a temporary workaround until a patch is available. Restrict access to the multicall interface to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Weakness Enumeration

CWE-254

Related Identifiers

BDU:2015-12111

CVE-2015-7812

DSA-3414-1

MGASA-2016-0098

Affected Products

Xen

References · 87

• http://debian.org/security/2015/dsa-3414 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3259 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7970 · Security Note
• https://osv.dev/vulnerability/MGASA-2016-0098 · Vendor Advisory
• http://xenbits.xen.org/xsa/advisory-145.html · Vendor Advisory
• https://security.gentoo.org/glsa/201604-03 · Vendor Advisory
• https://bdu.fstec.ru/vul/2015-12106 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7971 · Security Note
• https://advisories.mageia.org/MGASA-2016-0098.html · Security Note
• https://security-tracker.debian.org/tracker/DSA-3414-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2015-7812 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7814 · Security Note
• https://cve.org/CVERecord?id=CVE-2015-7812 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2015-7812 · Vendor Advisory
• https://ubuntu.com/security/CVE-2015-7812 · Vendor Advisory