Linux Kernel up to 4.13.3 CR8 arch/x86/kvm/vmx.c prepare_vmcs02 access control

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5.9$0-$5k0.00

A vulnerability has been found in Linux Kernel up to 4.13.3 (Operating System) and classified as critical. Affected by this vulnerability is the function prepare_vmcs02 of the file arch/x86/kvm/vmx.c of the component CR8 Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-284. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 09/15/2017. The weakness was released 09/26/2017 by Jim Mattson (Matt) with Google as confirmed git commit (GIT Repository). It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2017-12154 since 08/01/2017. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 103363 (Debian DLA-1099-1 : linux security update (BlueBorne) (Stack Clash)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351447 (Amazon Linux Security Advisory for kernel: ALAC2012-2018-013).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 100856) and Tenable (103363). Entries connected to this vulnerability are available at 102802, 103034, 104449 and 104864.

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VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 103363
Nessus Name: Debian DLA-1099-1 : linux security update (BlueBorne) (Stack Clash)
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 53754
OpenVAS Name: Debian Security Advisory DSA 3981-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfoedit

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Countermeasuresinfoedit

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfoedit

08/01/2017 🔍
09/12/2017 +42 days 🔍
09/15/2017 +3 days 🔍
09/20/2017 +5 days 🔍
09/21/2017 +1 days 🔍
09/26/2017 +5 days 🔍
09/26/2017 +0 days 🔍
09/26/2017 +0 days 🔍
01/14/2021 +1206 days 🔍

Sourcesinfoedit

Vendor: https://www.kernel.org/

Advisory: git.kernel.org
Researcher: Jim Mattson (Matt)
Organization: Google
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12154 (🔍)
OVAL: 🔍

SecurityFocus: 100856 - Linux Kernel CVE-2017-12154 Denial of Service Vulnerability

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Entryinfoedit

Created: 09/26/2017 03:12 PM
Updated: 01/14/2021 01:17 PM
Changes: (2) advisory_person_name vulnerability_cvss2_nvd_basescore
Complete: 🔍

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