Linux Kernel up to 4.13.5 arch/x86/kvm/mmu.c path traversal

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.13.5 and classified as critical. The affected element is an unknown function of the file arch/x86/kvm/mmu.c. Such manipulation leads to path traversal. This vulnerability is uniquely identified as CVE-2017-12188. Local access is required to approach this attack. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.13.5 (Operating System) and classified as critical. Affected by this issue is an unknown code of the file arch/x86/kvm/mmu.c. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

arch/x86/kvm/mmu.c in the Linux kernel through 4.13.5, when nested virtualisation is used, does not properly traverse guest pagetable entries to resolve a guest virtual address, which allows L1 guest OS users to execute arbitrary code on the host OS or cause a denial of service (incorrect index during page walking, and host OS crash), aka an "MMU potential stack buffer overrun."

The bug was discovered 10/16/2017. The weakness was disclosed 10/11/2017 as Bug 1500380 as confirmed bug report (Bugzilla). The advisory is available at bugzilla.redhat.com. This vulnerability is handled as CVE-2017-12188 since 08/01/2017. Local access is required to approach this attack. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 104132 (Virtuozzo 7 : readykernel-patch (VZA-2017-098)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Virtuozzo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 236664 (Red Hat Update for kernel (RHSA-2018:0395)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (104132) and SecurityFocus (BID 101267†). The entry VDB-107763 is pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
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: 104132
Nessus Name: Virtuozzo 7 : readykernel-patch (VZA-2017-098)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 10930
OpenVAS Name: Ubuntu Update for linux USN-3487-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

08/01/2017 🔍
10/10/2017 +69 days 🔍
10/11/2017 +1 days 🔍
10/11/2017 +0 days 🔍
10/12/2017 +1 days 🔍
10/16/2017 +4 days 🔍
10/23/2017 +7 days 🔍
10/25/2017 +2 days 🔍
01/16/2021 +1179 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: Bug 1500380
Researcher: Ladislav
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12188 (🔍)
GCVE (CVE): GCVE-0-2017-12188
GCVE (VulDB): GCVE-100-107762
SecurityFocus: 101267

See also: 🔍

Entryinfo

Created: 10/12/2017 10:24
Updated: 01/16/2021 18:01
Changes: 10/12/2017 10:24 (76), 11/24/2019 08:31 (4), 01/16/2021 18:01 (5)
Complete: 🔍
Cache ID: 216:DE6:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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