Linux Foundation Xen 4.0/4.2/4.3/4.4 HVMOP_track_dirty_vram race condition

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3.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Foundation Xen 4.0/4.2/4.3/4.4. It has been rated as problematic. Affected by this vulnerability is the function HVMOP_track_dirty_vram. Performing a manipulation results in race condition. This vulnerability was named CVE-2014-7154. There is no available exploit. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Foundation Xen 4.0/4.2/4.3/4.4 (Virtualization Software). This affects the function HVMOP_track_dirty_vram. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on availability. The summary by CVE is:

Race condition in HVMOP_track_dirty_vram in Xen 4.0.0 through 4.4.x does not ensure possession of the guarding lock for dirty video RAM tracking, which allows certain local guest domains to cause a denial of service via unspecified vectors.

The weakness was presented 09/23/2014 by Andrew Cooper with Citrix as XSA-104 as confirmed advisory (Website). It is possible to read the advisory at xenbits.xen.org. This vulnerability is uniquely identified as CVE-2014-7154 since 09/24/2014. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 80263 (GLSA-201412-42 : Xen: Denial of Service), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 123470 (Fedora Security Update for xen (FEDORA-2015-3721)).

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:

There is no mitigation available for this issue. (The security of a Xen system using stub domains is still better than with a qemu-dm running as an unrestricted dom0 process. Therefore users with these configurations should not switch to an unrestricted dom0 qemu-dm.)

The vulnerability is also documented in the databases at X-Force (96149), Tenable (80263), SecurityFocus (BID 70055†), Secunia (SA61501†) and SecurityTracker (ID 1030887†). See VDB-68221, VDB-68255, VDB-68298 and VDB-71769 for similar entries. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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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: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 80263
Nessus Name: GLSA-201412-42 : Xen: Denial of Service
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: 🔍

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

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 🔍
12/29/2014 +88 days 🔍
03/08/2019 +1530 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-104
Researcher: Andrew Cooper
Organization: Citrix
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-7154 (🔍)
GCVE (CVE): GCVE-0-2014-7154
GCVE (VulDB): GCVE-100-67683

OVAL: 🔍

X-Force: 96149 - Xen HVMOP_track_dirty_vram denial of service, Low Risk
SecurityFocus: 70055 - Xen 'HVMOP_track_dirty_vram()' Local Denial of Service Vulnerability
Secunia: 61501 - Xen "shadow_track_dirty_vram()" Race Condition Denial of Service Vulnerability, Not Critical
SecurityTracker: 1030887

See also: 🔍

Entryinfo

Created: 09/24/2014 11:34
Updated: 03/08/2019 20:54
Changes: 09/24/2014 11:34 (71), 03/08/2019 20:54 (16)
Complete: 🔍
Cache ID: 216::103

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