Linux Foundation Xen 4.5.0 on ARM Register GICD.SGIR input validation

CVSS Meta Temp Score
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5.4$0-$5k0.00

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) and Tenable (84704).

Not Affected

  • Linux Foundation Xen on x86

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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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

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Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

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

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
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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 (🔍)
X-Force: 100868 - Xen GICD.SGIR denial of service, Medium Risk
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
SecurityFocus: 72591 - Xen CVE-2015-0268 Denial of Service Vulnerability

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: 🔍

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