Linux Kernel up to 4.13.4 Keyring credentials management

CVSS Meta Temp Score
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 4.13.4 and classified as critical. The affected element is an unknown function of the component Keyring Handler. Performing a manipulation results in credentials management. This vulnerability is identified as CVE-2017-18270. The attack is only possible with local access. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.13.4 (Operating System). This affects an unknown part of the component Keyring Handler. The manipulation with an unknown input leads to a credentials management vulnerability. CWE is classifying the issue as CWE-255. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel before 4.13.5, a local user could create keyrings for other users via keyctl commands, setting unwanted defaults or causing a denial of service.

The bug was discovered 09/25/2017. The weakness was released 05/18/2018 as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2017-18270 since 05/18/2018. An attack has to be approached locally. A authentication is necessary for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1552 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 214 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109380 (CentOS 7 : kernel (CESA-2018:1062)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351447 (Amazon Linux Security Advisory for kernel: ALAC2012-2018-013).

Upgrading to version 4.13.5 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 even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (109380) and SecurityFocus (BID 104254†). Entries connected to this vulnerability are available at VDB-106966, VDB-110109, VDB-110311 and VDB-111673. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.1
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Credentials management
CWE: CWE-255
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: 109380
Nessus Name: CentOS 7 : kernel (CESA-2018:1062)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.13.5
Patch: git.kernel.org

Timelineinfo

09/25/2017 🔍
04/27/2018 +214 days 🔍
04/27/2018 +0 days 🔍
05/18/2018 +20 days 🔍
05/18/2018 +0 days 🔍
05/18/2018 +0 days 🔍
05/18/2018 +0 days 🔍
05/19/2018 +1 days 🔍
09/13/2024 +2309 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2018:1062
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-18270 (🔍)
GCVE (CVE): GCVE-0-2017-18270
GCVE (VulDB): GCVE-100-117981
SecurityFocus: 104254 - Linux Kernel CVE-2017-18270 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 05/19/2018 09:13
Updated: 09/13/2024 15:22
Changes: 05/19/2018 09:13 (76), 02/07/2020 11:39 (5), 03/14/2023 10:00 (4), 03/14/2023 10:03 (1), 03/14/2023 10:07 (1), 09/13/2024 15:22 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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