CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.2	$0-$5k	0.00

A vulnerability, which was classified as critical, was found in Linux Foundation Xen up to 4.4.1 (Virtualization Software). This affects an unknown code block of the component Session. 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 shared 10/02/2014 by Andrew Cooper with Citrix as XSA-104 as confirmed security advisory (Website). The advisory is shared at xenbits.xen.org. This vulnerability is uniquely identified as CVE-2014-7154 since 09/24/2014. The exploitability is told to be easy. Access to the local network is required for this attack. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 77933 (Fedora 21 : xen-4.4.1-4.fc21 (2014-11271)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks. 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. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (77933). The entries 67683, 68221, 68255 and 68298 are related to this item.

Productinfo

Type

• Virtualization Software

Vendor

• Linux Foundation

Name

• Xen

Version

• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6.1
• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.3.0
• 4.3.1
• 4.4.0
• 4.4.1

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 77933
Nessus Name: Fedora 21 : xen-4.4.1-4.fc21 (2014-11271)
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: 🔍
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 🔍
09/29/2014 +5 days 🔍
10/02/2014 +3 days 🔍
10/02/2014 +0 days 🔍
10/02/2014 +0 days 🔍
10/05/2014 +3 days 🔍
03/26/2015 +172 days 🔍
03/29/2022 +2560 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

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

CVE: CVE-2014-7154 (🔍)
OVAL: 🔍

SecurityTracker: 1030887
Vulnerability Center: 46333 - Xen 4.0.0 Through 4.4.x Local DoS via Unspecified Vectors, Medium
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

See also: 🔍

Entryinfo

Created: 03/26/2015 16:14
Updated: 03/29/2022 16:54
Changes: 03/26/2015 16:14 (74), 06/08/2017 08:54 (8), 03/29/2022 16:46 (3), 03/29/2022 16:54 (1)
Complete: 🔍

Discussion

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