Linux Foundation Xen 4.2/4.3/4.4 x86 Emulation access control

CVSS Meta Temp Score
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CTI Interest Score
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3.5$0-$5k0.00

A vulnerability classified as problematic was found in Linux Foundation Xen 4.2/4.3/4.4 (Virtualization Software). Affected by this vulnerability is an unknown code block of the component x86 Emulation. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect availability.

The weakness was released 09/23/2014 by Andrei Lutas as XSA-106 as confirmed advisory (Website). The advisory is shared at xenbits.xen.org. This vulnerability is known as CVE-2014-7156 since 09/24/2014. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 79542 (OracleVM 3.2 : xen (OVMSA-2014-0026)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370032 (Citrix XenServer Security Update (CTX200218)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at xenbits.xen.org. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

Running only PV guests will avoid this issue. There is no mitigation available for HVM guests.

The vulnerability is also documented in the databases at X-Force (96147), Tenable (79542), SecurityFocus (BID 70062†), Secunia (SA61500†) and SecurityTracker (ID 1030889†). Entries connected to this vulnerability are available at VDB-67682, VDB-67719, VDB-71771 and VDB-71770.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.5

VulDB Base Score: 4.0
VulDB Temp Score: 3.5
VulDB Vector: 🔍
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CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

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Nessus ID: 79542
Nessus Name: OracleVM 3.2 : xen (OVMSA-2014-0026)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 801150
OpenVAS Name: Fedora Update for xen FEDORA-2014-15503
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Patch: xenbits.xen.org

Timelineinfo

09/23/2014 🔍
09/23/2014 +0 days 🔍
09/23/2014 +0 days 🔍
09/24/2014 +1 days 🔍
09/24/2014 +0 days 🔍
09/24/2014 +0 days 🔍
09/24/2014 +0 days 🔍
10/02/2014 +8 days 🔍
11/26/2014 +55 days 🔍
02/20/2022 +2643 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-106
Researcher: Andrei Lutas
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-7156 (🔍)
OVAL: 🔍

X-Force: 96147 - Xen software denial of service, Low Risk
SecurityFocus: 70062 - Xen Supervisor Mode Permission Checks Local Denial of Service Vulnerability
Secunia: 61500 - Xen Protected Mode Software Interrupts Emulation Denial of Service Vulnerability, Not Critical
SecurityTracker: 1030889

See also: 🔍

Entryinfo

Created: 09/24/2014 11:31 AM
Updated: 02/20/2022 11:27 PM
Changes: 09/24/2014 11:31 AM (70), 03/08/2019 08:40 PM (15), 02/20/2022 11:27 PM (3)
Complete: 🔍
Cache ID: 18:692:40

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