Linux Kernel up to 3.6.8 X86_CR4_OSXSAVE denial of service

CVSS Meta Temp Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 3.6.8. It has been classified as problematic. Affected is an unknown function in the library X86_CR4_OSXSAVE. This manipulation causes denial of service. This vulnerability is tracked as CVE-2012-4461. Moreover, an exploit is present. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 3.6.8 (Operating System) and classified as critical. Affected by this vulnerability is an unknown code block in the library X86_CR4_OSXSAVE. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

The KVM subsystem in the Linux kernel before 3.6.9, when running on hosts that use qemu userspace without XSAVE, allows local users to cause a denial of service (kernel OOPS) by using the KVM_SET_SREGS ioctl to set the X86_CR4_OSXSAVE bit in the guest cr4 register, then calling the KVM_RUN ioctl.

The weakness was disclosed 11/06/2012 by Jon Howell as Bug 862900 as not defined advisory (Red Hat Security Advisory). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2012-4461 since 08/21/2012. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a private exploit are known.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 78877 (F5 Networks BIG-IP : Linux kernel vulnerability (SOL15797)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350580 (Amazon Linux Security Advisory for kernel: ALAS-2013-166).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at article.gmane.org.

The vulnerability is also documented in the databases at X-Force (79821), Tenable (78877), SecurityFocus (BID 56414†), OSVDB (87098†) and Secunia (SA51160†). 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: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.5
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Private
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 78877
Nessus Name: F5 Networks BIG-IP : Linux kernel vulnerability (SOL15797)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 892668
OpenVAS Name: Debian Security Advisory DSA 2668-1 (linux-2.6 - privilege escalation/denial of service/information leak
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: article.gmane.org
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Timelineinfo

08/21/2012 🔍
11/06/2012 +77 days 🔍
11/06/2012 +0 days 🔍
11/07/2012 +1 days 🔍
11/07/2012 +0 days 🔍
11/09/2012 +2 days 🔍
01/22/2013 +74 days 🔍
11/06/2014 +653 days 🔍
11/06/2014 +0 days 🔍
01/08/2015 +63 days 🔍
04/19/2021 +2293 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: Bug 862900
Researcher: Jon Howell
Status: Not defined
Confirmation: 🔍

CVE: CVE-2012-4461 (🔍)
GCVE (CVE): GCVE-0-2012-4461
GCVE (VulDB): GCVE-100-6907

OVAL: 🔍

X-Force: 79821
SecurityFocus: 56414 - Linux Kernel KVM CVE-2012-4461 Local Denial of Service Vulnerability
Secunia: 51160 - KVM XSAVE Handling Denial of Service Vulnerability, Not Critical
OSVDB: 87098
Vulnerability Center: 47975 - Linux Kernel Local Denial of Service due to an Error in the KVM Subsystem, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/09/2012 14:33
Updated: 04/19/2021 08:40
Changes: 11/09/2012 14:33 (77), 06/17/2017 07:44 (11), 04/19/2021 08:40 (3)
Complete: 🔍
Committer:
Cache ID: 216::103

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

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