Linux Kernel up to 4.5.2 overlayfs access control

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.5.2. It has been classified as problematic. Affected is an unknown function of the component overlayfs. This manipulation causes access control. This vulnerability is tracked as CVE-2016-1575. The attack is restricted to local execution. Moreover, an exploit is present. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.5.2 (Operating System) and classified as critical. Affected by this vulnerability is an unknown code block of the component overlayfs. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The overlayfs implementation in the Linux kernel through 4.5.2 does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.

The weakness was disclosed 05/02/2016 (Website). The advisory is shared at launchpad.net. This vulnerability is known as CVE-2016-1575 since 01/12/2016. An attack has to be approached locally. The requirement for exploitation is a single authentication. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 88895 (Ubuntu 14.04 LTS : linux vulnerabilities (USN-2907-1)), 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 196406 (Ubuntu Security Notification for Linux-lts-utopic Vulnerabilities (USN-2909-1)).

Upgrading eliminates this vulnerability. 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 Exploit-DB (41762) and Tenable (88895). The entry VDB-83138 is pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
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-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 88895
Nessus Name: Ubuntu 14.04 LTS : linux vulnerabilities (USN-2907-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 864193
OpenVAS Name: Ubuntu Update for linux USN-2907-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

01/12/2016 🔍
02/22/2016 +41 days 🔍
02/23/2016 +1 days 🔍
05/02/2016 +69 days 🔍
05/02/2016 +0 days 🔍
05/03/2016 +1 days 🔍
11/30/2024 +3133 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-2907-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-1575 (🔍)
GCVE (CVE): GCVE-0-2016-1575
GCVE (VulDB): GCVE-100-83137
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/03/2016 11:24
Updated: 11/30/2024 07:49
Changes: 05/03/2016 11:24 (62), 11/07/2018 16:32 (12), 07/27/2022 17:52 (3), 07/27/2022 17:59 (1), 11/30/2024 07:49 (25)
Complete: 🔍
Cache ID: 216:82F:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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