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-$5k0.00

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) and Tenable (78027). Entries connected to this vulnerability are available at 67681, 67682, 67719 and 71770.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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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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Exploitinginfo

Class: Access control
CWE: CWE-264
ATT&CK: T1068

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

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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: 🔍
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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: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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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 (🔍)
OVAL: 🔍

X-Force: 96147
SecurityTracker: 1030889
Vulnerability Center: 48522 - Xen 3.3 - 4.4 Local Network HVM Guest DoS Vulnerability in x86 Emulator, Low
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

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: 🔍

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