Linux Kernel 3.18.1 ecryptfs fs/ecryptfs/crypto.c ecryptfs_decode_from_filename numeric error

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.8	$0-$5k	0.00

A vulnerability was found in Linux Kernel 3.18.1 (Operating System). It has been declared as critical. This vulnerability affects the function ecryptfs_decode_from_filename of the file fs/ecryptfs/crypto.c of the component ecryptfs. The manipulation with an unknown input leads to a numeric error vulnerability. The CWE definition for the vulnerability is CWE-189. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 02/17/2015 by Dmitry Chernenkov as confirmed mailinglist post (oss-sec). The advisory is available at seclists.org. This vulnerability was named CVE-2014-9683 since 02/17/2015. The exploitation appears to be easy. Local access is required to approach this attack. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 84252 (Debian DLA-246-2 : linux-2.6 regression update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 155284 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2015-3053)).

Upgrading to version 3.18.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 5 months after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

- dst[dst_byte_offset] = 0;

The vulnerability is also documented in the databases at X-Force (100966) and Tenable (84252). Similar entries are available at 69021, 69206, 69207 and 74021.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

3.18.1

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 6.8

VulDB Base Score: 7.8
VulDB Temp Score: 6.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Numeric error
CWE: CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 84252
Nessus Name: Debian DLA-246-2 : linux-2.6 regression update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 80056
OpenVAS Name: Oracle Linux Local Check: ELSA-2015-3055
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 3.18.2
Patch: 942080643bce061c3dd9d5718d3b745dcb39a8bc

Timelineinfo

02/16/2015 🔍
02/17/2015 +0 days 🔍
02/17/2015 +0 days 🔍
02/17/2015 +0 days 🔍
02/18/2015 +1 days 🔍
02/19/2015 +0 days 🔍
03/03/2015 +12 days 🔍
03/06/2015 +3 days 🔍
06/17/2015 +102 days 🔍
06/18/2015 +1 days 🔍
03/10/2022 +2457 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-2515-1
Researcher: Dmitry Chernenkov
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-9683 (🔍)
OVAL: 🔍

X-Force: 100966 - Linux Kernel ecryptfs buffer overflow, Medium Risk
SecurityTracker: 1031860
Vulnerability Center: 48667 - Linux Kernel Local DoS or Privilege Escalation due to Buffer Overflow, Low
SecurityFocus: 72643 - Linux Kernel 'fs/ecryptfs/crypto.c' Local Buffer Overflow Vulnerability

See also: 🔍

Entryinfo

Created: 02/19/2015 10:14
Updated: 03/10/2022 14:30
Changes: 02/19/2015 10:14 (76), 09/24/2018 08:58 (15), 03/10/2022 14:26 (4), 03/10/2022 14:30 (1)
Complete: 🔍