Linux Foundation Xen up to 4.4.1 x86_emulate access control

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.14

Summaryinfo

A vulnerability was found in Linux Foundation Xen. It has been rated as problematic. The impacted element is the function x86_emulate. The manipulation leads to access control. This vulnerability is documented as CVE-2014-7156. There is not any exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Linux Foundation Xen (Virtualization Software) and classified as problematic. This issue affects the function x86_emulate. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is availability. The summary by CVE is:

The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 3.3.x through 4.4.x does not check the supervisor mode permissions for instructions that generate software interrupts, which allows local HVM guest users to cause a denial of service (guest crash) via unspecified vectors.

The weakness was released 10/02/2014 by Andrei Lutas as XSA-106 as confirmed security advisory (Website). It is possible to read the advisory at xenbits.xen.org. The identification of this vulnerability is CVE-2014-7156 since 09/24/2014. The exploitation is known to be easy. The attack needs to approached within the local network. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 78027 (Debian DSA-3041-1 : xen - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. 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. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (96147), Tenable (78027), SecurityFocus (BID 70062†), Secunia (SA61500†) and Vulnerability Center (SBV-48522†). Entries connected to this vulnerability are available at VDB-67681, VDB-67682, VDB-67719 and VDB-71770. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 78027
Nessus Name: Debian DSA-3041-1 : xen - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703041
OpenVAS Name: Debian Security Advisory DSA 3041-1 (xen - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

09/23/2014 🔍
09/23/2014 +0 days 🔍
09/24/2014 +1 days 🔍
09/24/2014 +0 days 🔍
10/02/2014 +8 days 🔍
10/02/2014 +0 days 🔍
10/02/2014 +0 days 🔍
02/09/2015 +130 days 🔍
03/26/2015 +45 days 🔍
03/29/2022 +2560 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

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

CVE: CVE-2014-7156 (🔍)
GCVE (CVE): GCVE-0-2014-7156
GCVE (VulDB): GCVE-100-71771

OVAL: 🔍

X-Force: 96147
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
Vulnerability Center: 48522 - Xen 3.3 - 4.4 Local Network HVM Guest DoS Vulnerability in x86 Emulator, Low

See also: 🔍

Entryinfo

Created: 03/26/2015 16:14
Updated: 03/29/2022 17:23
Changes: 03/26/2015 16:14 (73), 06/19/2017 08:40 (7), 03/29/2022 17:16 (3), 03/29/2022 17:23 (1)
Complete: 🔍
Cache ID: 216:2A2:103

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