Linux Foundation Xen up to 4.4.1 Kernel Mode x86_emulate access control

CVSS Meta Temp Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Foundation Xen. It has been declared as problematic. The affected element is the function x86_emulate of the component Kernel Mode. Executing a manipulation can lead to access control. This vulnerability is registered as CVE-2014-7155. No exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability has been found in Linux Foundation Xen (Virtualization Software) and classified as critical. This vulnerability affects the function x86_emulate of the component Kernel Mode. 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 confidentiality, integrity, and availability. CVE summarizes:

The x86_emulate function in arch/x86/x86_emulate/x86_emulate.c in Xen 4.4.x and earlier does not properly check supervisor mode permissions, which allows local HVM users to cause a denial of service (guest crash) or gain guest kernel mode privileges via vectors involving an (1) HLT, (2) LGDT, (3) LIDT, or (4) LMSW instruction.

The weakness was published 10/02/2014 by Andrei Lutas with BitDefender as XSA-105 as confirmed security advisory (Website). The advisory is available at xenbits.xen.org. This vulnerability was named CVE-2014-7155 since 09/24/2014. The exploitation appears to be easy. Access to the local network is required for this attack to succeed. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

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. 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 (96148), Tenable (79542), SecurityFocus (BID 70057†), Secunia (SA61858†) and Vulnerability Center (SBV-46334†). Similar entries are available at VDB-67681, VDB-67682, VDB-67719 and VDB-71771. If you want to get best quality of vulnerability data, you may have to visit VulDB.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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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: 79542
Nessus Name: OracleVM 3.2 : xen (OVMSA-2014-0026)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

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: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Timelineinfo

09/23/2014 🔍
09/23/2014 +0 days 🔍
09/24/2014 +1 days 🔍
10/02/2014 +8 days 🔍
10/02/2014 +0 days 🔍
10/02/2014 +0 days 🔍
10/05/2014 +3 days 🔍
10/21/2014 +16 days 🔍
11/26/2014 +36 days 🔍
03/26/2015 +120 days 🔍
03/29/2022 +2560 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-105
Researcher: Andrei Lutas
Organization: BitDefender
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-7155 (🔍)
GCVE (CVE): GCVE-0-2014-7155
GCVE (VulDB): GCVE-100-71770

OVAL: 🔍

X-Force: 96148
SecurityFocus: 70057 - Xen 'x86_emulate.c' Local Privilege Escalation Vulnerability
Secunia: 61858 - Citrix XenServer Multiple Vulnerabilities, Less Critical
SecurityTracker: 1030888
Vulnerability Center: 46334 - Xen 4.4.x and Earlier Local DoS or Privilege Escalation due to Improper Supervisor Mode Permissions Check, Medium

See also: 🔍

Entryinfo

Created: 03/26/2015 16:14
Updated: 03/29/2022 17:09
Changes: 03/26/2015 16:14 (76), 06/08/2017 08:55 (8), 03/29/2022 17:02 (3), 03/29/2022 17:09 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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