Linux Kernel up to 3.14.72/4.4.13/4.6.2 compat_setsockopt access control

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 3.14.72/4.4.13/4.6.2. It has been rated as critical. Impacted is the function compat_setsockopt. Performing a manipulation results in access control. This vulnerability is reported as CVE-2016-4997. The attack requires a local approach. Moreover, an exploit is present. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 3.14.72/4.4.13/4.6.2 (Operating System). This affects the function compat_setsockopt. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was disclosed 06/24/2016 (Website). The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2016-4997 since 05/24/2016. The exploitability is told to be easy. An attack has to be approached locally. The successful exploitation requires a authentication. Technical details and a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The exploit is shared for download at exploit-db.com. It is declared as highly functional. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 100990 (Ubuntu 12.04 LTS : linux vulnerabilities (USN-3338-1)), 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 196518 (Ubuntu Security Notification for Linux-lts-vivid Vulnerabilities (USN-3020-1)).

Upgrading to version 3.14.73, 4.4.14 or 4.6.3 eliminates this vulnerability. It is possible to mitigate the problem by applying the configuration setting kernel.unprivileged_userns_clone=0. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 2 years after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (40435), Tenable (100990), SecurityFocus (BID 91451†) and SecurityTracker (ID 1036171†). Further details are available at security-tracker.debian.org. The entries VDB-88138, VDB-88552 and VDB-91465 are 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: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Highly functional
Download: 🔍

EPSS Score: 🔍
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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100990
Nessus Name: Ubuntu 12.04 LTS : linux vulnerabilities (USN-3338-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800225
OpenVAS Name: Ubuntu Update for linux-lts-wily USN-3017-3
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

MetaSploit ID: netfilter_priv_esc.rb
MetaSploit Name: Linux Kernel 4.6.3 Netfilter Privilege Escalation
MetaSploit File: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Kernel 3.14.73/4.4.14/4.6.3
Patch: git.kernel.org
Config: kernel.unprivileged_userns_clone=0

Timelineinfo

05/24/2016 🔍
06/24/2016 +31 days 🔍
06/24/2016 +0 days 🔍
06/27/2016 +3 days 🔍
06/27/2016 +0 days 🔍
07/03/2016 +5 days 🔍
06/21/2017 +353 days 🔍
06/22/2017 +1 days 🔍
11/11/2024 +2699 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3338-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-4997 (🔍)
GCVE (CVE): GCVE-0-2016-4997
GCVE (VulDB): GCVE-100-88137

OVAL: 🔍

SecurityFocus: 91451 - Linux Kernel Multiple Local Memory Corruption Vulnerabilities
SecurityTracker: 1036171

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 06/27/2016 14:43
Updated: 11/11/2024 10:18
Changes: 06/27/2016 14:43 (79), 02/10/2019 11:48 (16), 08/24/2022 16:01 (6), 08/24/2022 16:07 (1), 08/24/2022 16:14 (1), 11/11/2024 10:18 (14)
Complete: 🔍
Cache ID: 216:943:103

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

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