VDB-9110 · CVE-2013-1943 · RHSA-2013:0911-1

Linux Kernel KVM kvm_set_memory_region input validation

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8.4	$0-$5k	0.00

A vulnerability, which was classified as critical, has been found in Linux Kernel (Operating System) (the affected version unknown). Affected by this issue is the function kvm_set_memory_region of the component KVM. The manipulation with an unknown input 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 confidentiality, integrity, and availability. CVE summarizes:

The KVM subsystem in the Linux kernel before 3.0 does not check whether kernel addresses are specified during allocation of memory slots for use in a guest s physical address space, which allows local users to gain privileges or obtain sensitive information from kernel memory via a crafted application, related to arch/x86/kvm/paging_tmpl.h and virt/kvm/kvm_main.c.

The weakness was published 06/10/2013 by Michael S. Tsirkin as RHSA-2013:0911-1 as not defined advisory (Red Hat Security Advisory). The advisory is available at rhn.redhat.com. The public release has been coordinated with the vendor. This vulnerability is handled as CVE-2013-1943 since 02/19/2013. The exploitation is known to be difficult. Local access is required to approach this attack. A simple authentication is necessary for exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 66887 (CentOS 6 : kernel (CESA-2013:0911)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 195959 (Ubuntu Security Notification for Linux Vulnerabilities (USN-1939-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. Red Hat has released a patch for their Linux distribution.

The vulnerability is also documented in the databases at X-Force (84865) and Tenable (66887). Similar entries are available at 9111, 9561 and 64082.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

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: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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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: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

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: 66887
Nessus Name: CentOS 6 : kernel (CESA-2013:0911)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 881747
OpenVAS Name: CentOS Update for kernel CESA-2013:0911 centos6
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

02/19/2013 🔍
06/10/2013 +111 days 🔍
06/10/2013 +0 days 🔍
06/11/2013 +1 days 🔍
06/12/2013 +1 days 🔍
06/12/2013 +0 days 🔍
07/16/2013 +34 days 🔍
05/14/2021 +2859 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2013:0911-1
Researcher: Michael S. Tsirkin
Status: Not defined
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-1943 (🔍)
OVAL: 🔍

X-Force: 84865
Vulnerability Center: 39955 - Multiple Red Hat Enterprise Linux Products Kernel \x27kvm_set_memory_region()\x27 Allows Local Privileges Escalation, High
Secunia: 53775 - Red Hat update for kernel, Less Critical
OSVDB: 94133

See also: 🔍

Entryinfo

Created: 06/12/2013 13:00
Updated: 05/14/2021 20:38
Changes: 06/12/2013 13:00 (79), 05/02/2017 08:38 (2), 05/14/2021 20:38 (3)
Complete: 🔍
Committer: