Linux Kernel up to 4.8.2 Filesystem setxattr improper authorization

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel up to 4.8.2. This vulnerability affects the function setxattr of the component Filesystem. Performing a manipulation results in improper authorization. This vulnerability was named CVE-2016-7097. The attack needs to be approached locally. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.8.2 (Operating System). It has been classified as problematic. This affects the function setxattr of the component Filesystem. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The filesystem implementation in the Linux kernel through 4.8.2 preserves the setgid bit during a setxattr call, which allows local users to gain group privileges by leveraging the existence of a setgid program with restrictions on execute permissions.

The weakness was presented 10/16/2016 with Red Hat (Website). The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2016-7097 since 08/26/2016. The exploitability is told to be easy. An attack has to be approached locally. A authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 95433 (Ubuntu 14.04 LTS : linux-lts-xenial vulnerabilities (USN-3146-2)), 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 169396 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2016:2912-1)).

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

The vulnerability is also documented in the databases at Tenable (95433) and SecurityFocus (BID 92659†). See VDB-88576, VDB-92734, VDB-92735 and VDB-93852 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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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

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

NVD Base Score: 4.4
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / 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: 95433
Nessus Name: Ubuntu 14.04 LTS : linux-lts-xenial vulnerabilities (USN-3146-2)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802731
OpenVAS Name: Ubuntu Update for linux-lts-xenial USN-3146-2
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: 🔍

Patch: git.kernel.org

Timelineinfo

08/25/2016 🔍
08/26/2016 +1 days 🔍
10/16/2016 +51 days 🔍
10/16/2016 +0 days 🔍
10/17/2016 +1 days 🔍
11/30/2016 +44 days 🔍
12/01/2016 +1 days 🔍
09/26/2022 +2125 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3146-2
Organization: Red Hat
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-7097 (🔍)
GCVE (CVE): GCVE-0-2016-7097
GCVE (VulDB): GCVE-100-92733
SecurityFocus: 92659 - Linux Kernel Local Security Bypass Vulnerability
SecurityTracker: 1038201

See also: 🔍

Entryinfo

Created: 10/17/2016 10:26
Updated: 09/26/2022 11:09
Changes: 10/17/2016 10:26 (67), 05/11/2019 07:15 (15), 09/26/2022 10:57 (5), 09/26/2022 11:04 (1), 09/26/2022 11:09 (1)
Complete: 🔍
Cache ID: 216::103

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