Linux Foundation Xen 4.5.0 on ARM Register GICD.SGIR 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.
5.4$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Linux Foundation Xen 4.5.0 on ARM. This issue affects some unknown processing of the component Register Handler. Executing a manipulation of the argument GICD.SGIR can lead to input validation. This vulnerability is tracked as CVE-2015-0268. No exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Linux Foundation Xen 4.5.0 on ARM (Virtualization Software). It has been declared as problematic. This vulnerability affects an unknown code block of the component Register Handler. The manipulation of the argument GICD.SGIR with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability.

The weakness was disclosed 02/12/2015 by Julien Grall as XSA-117 as confirmed advisory (Website). The advisory is shared for download at xenbits.xen.org. This vulnerability was named CVE-2015-0268 since 11/18/2014. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The advisory points out:

When decoding a guest write to a specific register in the virtual interrupt controller Xen would treat an invalid value as a critical error and crash the host.

The vulnerability scanner Nessus provides a plugin with the ID 84704 (FreeBSD : xen-kernel -- arm: vgic-v2: GICD_SGIR is not properly emulated (785c86b1-27d6-11e5-a4a5-002590263bf5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks.

Applying the patch xsa117.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 vulnerability is also documented in the databases at X-Force (100868), Tenable (84704), SecurityFocus (BID 72591†), SecurityTracker (ID 1031746†) and Vulnerability Center (SBV-48636†). Once again VulDB remains the best source for vulnerability data.

Not Affected

  • Linux Foundation Xen on x86

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 5.4

VulDB Base Score: 6.2
VulDB Temp Score: 5.4
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: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 84704
Nessus Name: FreeBSD : xen-kernel -- arm: vgic-v2: GICD_SGIR is not properly emulated (785c86b1-27d6-11e5-a4a5-002590263bf5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 12024
OpenVAS Name: Mageia Linux Local Check: mgasa-2016-0098
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: xsa117.patch

Timelineinfo

11/18/2014 🔍
02/12/2015 +86 days 🔍
02/12/2015 +0 days 🔍
02/12/2015 +0 days 🔍
02/12/2015 +0 days 🔍
02/12/2015 +0 days 🔍
02/13/2015 +1 days 🔍
02/15/2015 +2 days 🔍
02/16/2015 +1 days 🔍
03/10/2022 +2579 days 🔍

Sourcesinfo

Vendor: linuxfoundation.org

Advisory: XSA-117
Researcher: Julien Grall
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-0268 (🔍)
GCVE (CVE): GCVE-0-2015-0268
GCVE (VulDB): GCVE-100-69172
X-Force: 100868 - Xen GICD.SGIR denial of service, Medium Risk
SecurityFocus: 72591 - Xen CVE-2015-0268 Denial of Service Vulnerability
SecurityTracker: 1031746 - Xen GICD.SGIR Register Bug Lets Local Guest Users Deny Service on the Host
Vulnerability Center: 48636 - Xen Local DoS due to Error when Decoding a Guest Write to a Specific Register in Virtual Interrupt Controller, Medium

Entryinfo

Created: 02/13/2015 12:07
Updated: 03/10/2022 13:20
Changes: 02/13/2015 12:07 (76), 06/20/2017 08:30 (9), 03/10/2022 13:15 (2), 03/10/2022 13:20 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source 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!