Linux Foundation Xen 4.4.0 Xen Tools 32-bit ARM Guest Kernel input validation

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.
4.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Foundation Xen 4.4.0. It has been classified as problematic. This affects an unknown part of the component Xen Tools. The manipulation as part of 32-bit ARM Guest Kernel leads to input validation. This vulnerability is referenced as CVE-2014-3714. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Linux Foundation Xen 4.4.0 (Virtualization Software) and classified as problematic. This issue affects an unknown code block of the component Xen Tools. The manipulation as part of a 32-bit ARM Guest Kernel leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is availability. The summary by CVE is:

The ARM image loading functionality in Xen 4.4.x does not properly validate kernel length, which allows local users to read system memory or cause a denial of service (crash) via a crafted 32-bit ARM guest kernel in an image, which triggers a buffer overflow.

The weakness was published 05/14/2014 by Thomas Leonard as XSA-95 as confirmed advisory (Website). It is possible to read the advisory at xenbits.xenproject.org. The identification of this vulnerability is CVE-2014-3714 since 05/14/2014. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The advisory points out:

When loading a 32-bit ARM guest kernel the Xen tools did not correctly validate the length of the kernel against the actual image size. This would then lead to an overrun on the input buffer when loading the kernel into guest RAM

Applying the patch xsa95.patch is able to eliminate this problem. The bugfix is ready for download at xenbits.xenproject.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (93149), SecurityFocus (BID 67388†), SecurityTracker (ID 1030252†) and Vulnerability Center (SBV-44510†). openwall.com is providing further details. Similar entries are available at VDB-13236, VDB-13237, VDB-13238 and VDB-69740. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: xsa95.patch

Timelineinfo

05/14/2014 🔍
05/14/2014 +0 days 🔍
05/14/2014 +0 days 🔍
05/14/2014 +0 days 🔍
05/14/2014 +0 days 🔍
05/15/2014 +1 days 🔍
05/16/2014 +1 days 🔍
05/17/2014 +1 days 🔍
05/19/2014 +2 days 🔍
05/28/2017 +1105 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-95
Researcher: Thomas Leonard
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-3714 (🔍)
GCVE (CVE): GCVE-0-2014-3714
GCVE (VulDB): GCVE-100-13235
X-Force: 93149 - Xen ARM guest denial of service, Medium Risk
SecurityFocus: 67388 - Xen Loading Guest Kernel Multiple Denial of Service Vulnerabilities
SecurityTracker: 1030252 - Xen ARM Guest Loading Bugs Let Local Users Deny Service
Vulnerability Center: 44510 - Xen 4.4.x Local File System Read and DoS Due to a Flaw in Kernel Length Validation, Low

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 05/17/2014 11:33
Updated: 05/28/2017 02:56
Changes: 05/17/2014 11:33 (71), 05/28/2017 02:56 (7)
Complete: 🔍
Cache ID: 216:DB8:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!