XenSource Xen 4.4/4.5/4.6 Driver Domain arch/arm/p2m.c p2m_teardown null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability has been found in XenSource Xen 4.4/4.5/4.6 and classified as problematic. Affected by this vulnerability is the function p2m_teardown of the file arch/arm/p2m.c of the component Driver Domain Handler. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2016-5242. The attack can only be executed locally. There is no exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability classified as critical was found in XenSource Xen 4.4/4.5/4.6 (Virtualization Software). Affected by this vulnerability is the function p2m_teardown of the file arch/arm/p2m.c of the component Driver Domain Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The p2m_teardown function in arch/arm/p2m.c in Xen 4.4.x through 4.6.x allows local OS guest users with access to the driver domain to cause a denial of service (NULL pointer dereference and host OS crash) by creating concurrent domains and holding references to them, related to VMID exhaustion.

The weakness was shared 06/07/2016 by aaron (Website). The advisory is shared at xenbits.xen.org. This vulnerability is known as CVE-2016-5242 since 06/03/2016. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 92614 (Debian DSA-3633-1 : xen - security update (Bunker Buster)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175798 (Debian Security Update for xen (DSA 3633-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (92614) and SecurityFocus (BID 91015†). The entries VDB-79748, VDB-87542, VDB-87720 and VDB-90367 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.0

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.6
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 92614
Nessus Name: Debian DSA-3633-1 : xen - security update (Bunker Buster)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 11027
OpenVAS Name: Fedora Update for xen FEDORA-2016-389be30b95
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Timelineinfo

06/03/2016 🔍
06/03/2016 +0 days 🔍
06/07/2016 +4 days 🔍
06/07/2016 +0 days 🔍
06/08/2016 +1 days 🔍
07/27/2016 +49 days 🔍
07/29/2016 +2 days 🔍
08/23/2022 +2216 days 🔍

Sourcesinfo

Vendor: citrix.com

Advisory: xenbits.xen.org
Researcher: aaron
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-5242 (🔍)
GCVE (CVE): GCVE-0-2016-5242
GCVE (VulDB): GCVE-100-87769

OVAL: 🔍

SecurityFocus: 91015 - Xen VMID Exhaustion Denial of Service Vulnerability
SecurityTracker: 1036035

See also: 🔍

Entryinfo

Created: 06/08/2016 10:16
Updated: 08/23/2022 09:09
Changes: 06/08/2016 10:16 (68), 01/08/2019 11:12 (15), 08/23/2022 09:09 (3)
Complete: 🔍
Cache ID: 216:B01:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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