Linux Kernel up to 4.14.5 KEYS Subsystem request_key.c request_key System Calls access control

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.14.5. Affected is the function request_key of the file security/keys/request_key.c of the component KEYS Subsystem. The manipulation as part of System Calls leads to access control. This vulnerability is traded as CVE-2017-17807. It is possible to launch the attack on the local host. There is no exploit available. It is recommended to apply a patch to fix this issue. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.14.5 (Operating System). It has been rated as critical. This issue affects the function request_key of the file security/keys/request_key.c of the component KEYS Subsystem. The manipulation as part of a System Calls leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The KEYS subsystem in the Linux kernel before 4.14.6 omitted an access-control check when adding a key to the current task's "default request-key keyring" via the request_key() system call, allowing a local user to use a sequence of crafted system calls to add keys to a keyring with only Search permission (not Write permission) to that keyring, related to construct_get_dest_keyring() in security/keys/request_key.c.

The bug was discovered 12/08/2017. The weakness was presented 12/20/2017 as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2017-17807 since 12/20/2017. An attack has to be approached locally. A simple authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 12 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 105433 (Debian DSA-4073-1 : linux - security update), 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 l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157931 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2019-4575)).

Upgrading to version 4.14.6 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 3 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (105433) and SecurityFocus (BID 102301†). See VDB-110931, VDB-110932, VDB-111024 and VDB-111025 for similar entries. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

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

NVD Base Score: 3.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 105433
Nessus Name: Debian DSA-4073-1 : linux - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 56363
OpenVAS Name: Debian Lts Announce DLA 1232-1 ([SECURITY] [DLA 1232-1] linux security update)
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 4.14.6
Patch: git.kernel.org

Timelineinfo

12/08/2017 🔍
12/20/2017 +12 days 🔍
12/20/2017 +0 days 🔍
12/20/2017 +0 days 🔍
12/20/2017 +0 days 🔍
12/21/2017 +1 days 🔍
12/23/2017 +2 days 🔍
12/26/2017 +3 days 🔍
01/18/2023 +1849 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 4dca6ea1d9432052afb06baf2e3ae78188a4410b
Researcher: Eric Biggers.
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-17807 (🔍)
GCVE (CVE): GCVE-0-2017-17807
GCVE (VulDB): GCVE-100-110933

OVAL: 🔍

SecurityFocus: 102301 - Linux Kernel CVE-2017-17807 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 12/21/2017 08:46
Updated: 01/18/2023 14:22
Changes: 12/21/2017 08:46 (85), 12/28/2019 10:17 (5), 01/27/2021 17:00 (2), 01/18/2023 14:21 (2), 01/18/2023 14:22 (1)
Complete: 🔍
Cache ID: 216:ACC:103

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