Linux Kernel up to 4.0.1 System Call fs/namespace.c access control

CVSS Meta Temp Score
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CTI Interest Score
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7.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 4.0.1. Impacted is an unknown function of the file fs/namespace.c of the component System Call Handler. Such manipulation leads to access control. This vulnerability is uniquely identified as CVE-2014-9717. Local access is required to approach this attack. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.0.1 (Operating System). It has been rated as critical. Affected by this issue is an unknown function of the file fs/namespace.c of the component System Call Handler. The manipulation with an unknown input 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. CVE summarizes:

fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace.

The weakness was disclosed 05/02/2016 (Website). The advisory is shared for download at groups.google.com. This vulnerability is handled as CVE-2014-9717. The attack needs to be approached locally. The successful exploitation requires a simple authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 93168 (SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2016:1696-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169014 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2016:1937-1)).

Upgrading to version 4.0.2 eliminates this vulnerability. A possible mitigation has been published 3 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (93168) and SecurityFocus (BID 74226†). The entries VDB-82948, VDB-88358 and VDB-90525 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.1

VulDB Base Score: 8.4
VulDB Temp Score: 8.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.1
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: 🔍

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: 93168
Nessus Name: SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2016:1696-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 850584
OpenVAS Name: SuSE Update for the SUSE-SU-2016:1690-1 (kernel)
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: 🔍

Upgrade: Kernel 4.0.2
Patch: git.kernel.org

Timelineinfo

04/17/2015 🔍
04/18/2015 +1 days 🔍
05/02/2016 +380 days 🔍
05/02/2016 +0 days 🔍
05/03/2016 +1 days 🔍
06/28/2016 +56 days 🔍
08/29/2016 +62 days 🔍
07/27/2022 +2158 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: ce07d891a0891d3c0d0c2d73d577490486b809e1
Status: Not defined
Confirmation: 🔍

CVE: CVE-2014-9717 (🔍)
GCVE (CVE): GCVE-0-2014-9717
GCVE (VulDB): GCVE-100-83132
SecurityFocus: 74226 - Linux Kernel CVE-2014-9717 Local Privilege Escalation Vulnerability

See also: 🔍

Entryinfo

Created: 05/03/2016 11:24
Updated: 07/27/2022 17:12
Changes: 05/03/2016 11:24 (69), 11/07/2018 16:31 (12), 07/27/2022 17:12 (5)
Complete: 🔍
Cache ID: 216:86D:103

Once again VulDB remains the best source for vulnerability data.

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