Linux Kernel up to 4.9.4 arch/x86/kvm/emulate.c access control

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

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 4.9.4. This impacts an unknown function of the file arch/x86/kvm/emulate.c. Executing a manipulation can lead to access control. This vulnerability is handled as CVE-2017-2583. It is possible to launch the attack on the local host. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.9.4 (Operating System) and classified as critical. This vulnerability affects an unknown code block of the file arch/x86/kvm/emulate.c. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The load_segment_descriptor implementation in arch/x86/kvm/emulate.c in the Linux kernel before 4.9.5 improperly emulates a "MOV SS, NULL selector" instruction, which allows guest OS users to cause a denial of service (guest OS crash) or gain guest OS privileges via a crafted application.

The bug was discovered 01/19/2017. The weakness was released 02/06/2017 with Huawei (Website). The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2017-2583 since 12/01/2016. The attack needs to be approached locally. The requirement for exploitation is a single authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 96708 (Fedora 25 : kernel (2017-e6012e74b6)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169712 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2017:0464-1)).

Upgrading to version 4.9.5 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (96708) and SecurityFocus (BID 95673†). Entry connected to this vulnerability is available at VDB-95342. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

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

NVD Base Score: 8.4
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 96708
Nessus Name: Fedora 25 : kernel (2017-e6012e74b6)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703791
OpenVAS Name: Debian Security Advisory DSA 3791-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.9.5
Patch: git.kernel.org

Timelineinfo

12/01/2016 🔍
01/19/2017 +49 days 🔍
01/19/2017 +0 days 🔍
01/23/2017 +4 days 🔍
01/24/2017 +1 days 🔍
02/06/2017 +13 days 🔍
02/06/2017 +0 days 🔍
02/06/2017 +0 days 🔍
11/11/2022 +2104 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2017-e6012e74b6
Organization: Huawei
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-2583 (🔍)
GCVE (CVE): GCVE-0-2017-2583
GCVE (VulDB): GCVE-100-96556

OVAL: 🔍

SecurityFocus: 95673 - Linux Kernel CVE-2017-2583 Privilege Escalation Vulnerability
OSVDB: - CVE-2017-2583 - Linux - Privilege Escalation Issue

See also: 🔍

Entryinfo

Created: 02/06/2017 19:25
Updated: 11/11/2022 16:32
Changes: 02/06/2017 19:25 (76), 08/11/2020 09:31 (8), 11/11/2022 16:24 (4), 11/11/2022 16:32 (1)
Complete: 🔍
Cache ID: 216:3D6:103

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