Linux Kernel up to 4.6.2 fs/ecryptfs/kthread.c ecryptfs_privileged_open memory corruption

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

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.6.2. The affected element is the function ecryptfs_privileged_open of the file fs/ecryptfs/kthread.c. This manipulation causes memory corruption. The identification of this vulnerability is CVE-2016-1583. The attack can only be executed locally. Furthermore, there is an exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.6.2 (Operating System). It has been declared as critical. Affected by this vulnerability is the function ecryptfs_privileged_open of the file fs/ecryptfs/kthread.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The ecryptfs_privileged_open function in fs/ecryptfs/kthread.c in the Linux kernel before 4.6.3 allows local users to gain privileges or cause a denial of service (stack memory consumption) via vectors involving crafted mmap calls for /proc pathnames, leading to recursive pagefault handling.

The weakness was shared 06/27/2016 by Adam Maris (Website). The advisory is shared at kernel.org. This vulnerability is known as CVE-2016-1583 since 01/12/2016. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.

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 91562 (Ubuntu 14.04 LTS : linux-lts-utopic vulnerabilities (USN-3000-1)), 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 157985 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2019-4644)).

Upgrading to version 4.6.3 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 (39992), Tenable (91562) and SecurityFocus (BID 91157†). The entries VDB-82964, VDB-91456 and VDB-109195 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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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

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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: 91562
Nessus Name: Ubuntu 14.04 LTS : linux-lts-utopic vulnerabilities (USN-3000-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 840909
OpenVAS Name: Ubuntu Update for linux-lts-xenial USN-3005-1
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: 🔍

Upgrade: Kernel 4.6.3
Patch: git.kernel.org

Timelineinfo

01/12/2016 🔍
06/10/2016 +150 days 🔍
06/10/2016 +0 days 🔍
06/13/2016 +3 days 🔍
06/27/2016 +14 days 🔍
06/27/2016 +0 days 🔍
06/29/2016 +2 days 🔍
11/03/2024 +3049 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3000-1
Researcher: Adam Maris
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-1583 (🔍)
GCVE (CVE): GCVE-0-2016-1583
GCVE (VulDB): GCVE-100-88369

OVAL: 🔍

SecurityFocus: 91157 - Linux Kernel CVE-2016-1583 Stack-Based Buffer Overflow Vulnerability
SecurityTracker: 1036763

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

Entryinfo

Created: 06/29/2016 11:20
Updated: 11/03/2024 11:45
Changes: 06/29/2016 11:20 (67), 02/12/2019 10:33 (20), 08/25/2022 11:07 (5), 08/25/2022 11:15 (1), 08/25/2022 11:22 (1), 11/03/2024 11:45 (14)
Complete: 🔍
Cache ID: 216:700:103

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

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