Linux Kernel up to 4.13.9 KEYS Subsystem System Calls input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.13.9. It has been rated as critical. The impacted element is an unknown function of the component KEYS Subsystem. The manipulation as part of System Calls leads to input validation. This vulnerability is documented as CVE-2017-15951. The attack needs to be performed locally. There is not any exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 4.13.9 (Operating System). This issue affects an unknown function of the component KEYS Subsystem. The manipulation as part of a System Calls 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. The summary by CVE is:

The KEYS subsystem in the Linux kernel before 4.13.10 does not correctly synchronize the actions of updating versus finding a key in the "negative" state to avoid a race condition, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted system calls.

The bug was discovered 10/18/2017. The weakness was released 10/28/2017 as confirmed git commit (GIT Repository). It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2017-15951 since 10/27/2017. Attacking locally is a requirement. The successful exploitation requires a simple authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 9 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 104716 (Ubuntu 16.04 LTS : linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities (USN-3485-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351135 (Amazon Linux Security Advisory for kernel: ALAS-2017-925).

Upgrading to version 4.13.10 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (104716) and SecurityFocus (BID 101621†). Entries connected to this vulnerability are available at VDB-109128, VDB-109129, VDB-109130 and VDB-109132. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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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: Input validation
CWE: CWE-20
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: 104716
Nessus Name: Ubuntu 16.04 LTS : linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities (USN-3485-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 58195
OpenVAS Name: Fedora Update for kernel FEDORA-2017-ebab38baf6
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 4.13.10
Patch: git.kernel.org

Timelineinfo

10/18/2017 🔍
10/27/2017 +9 days 🔍
10/27/2017 +0 days 🔍
10/27/2017 +0 days 🔍
10/28/2017 +1 days 🔍
10/28/2017 +0 days 🔍
11/20/2017 +23 days 🔍
11/21/2017 +1 days 🔍
01/05/2023 +1871 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3485-1
Researcher: Eric Biggers
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-15951 (🔍)
GCVE (CVE): GCVE-0-2017-15951
GCVE (VulDB): GCVE-100-108731
SecurityFocus: 101621 - Linux kernel CVE-2017-15951 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 10/28/2017 10:28
Updated: 01/05/2023 09:16
Changes: 10/28/2017 10:28 (82), 12/01/2019 15:35 (5), 01/21/2021 07:27 (2), 01/05/2023 09:15 (3), 01/05/2023 09:16 (1)
Complete: 🔍
Cache ID: 216:3D6:103

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