Linux Kernel 2.6.x ext4 fs/ext4/extents.c Extent Splitting denial of service

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.
7.2$0-$5k0.00

A vulnerability was found in Linux Kernel 2.6.x (Operating System) and classified as critical. This issue affects the function Extent Splitting of the file fs/ext4/extents.c of the component ext4. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

fs/ext4/extents.c in the Linux kernel before 3.0 does not mark a modified extent as dirty in certain cases of extent splitting, which allows local users to cause a denial of service (system crash) via vectors involving ext4 umount and mount operations.

The weakness was presented 10/24/2011 with kernel.org as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2011-3638 since 09/21/2011. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 68454 (Oracle Linux 5 : kernel (ELSA-2012-0107)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 120042 (CentOS Security Update for Kernel (CESA-2012:0107)).

Upgrading 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 upgrading to the latest version.

The vulnerability is also documented in the databases at X-Force (70886) and Tenable (68454). See 6033, 6034, 61062 and 63673 for similar entries.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

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

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 68454
Nessus Name: Oracle Linux 5 : kernel (ELSA-2012-0107)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 881207
OpenVAS Name: CentOS Update for kernel CESA-2012:0107 centos5
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

09/21/2011 🔍
10/21/2011 +30 days 🔍
10/21/2011 +0 days 🔍
10/24/2011 +3 days 🔍
10/24/2011 +0 days 🔍
11/21/2011 +28 days 🔍
02/21/2012 +92 days 🔍
03/01/2013 +374 days 🔍
07/12/2013 +133 days 🔍
03/19/2021 +2807 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Organization: kernel.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-3638 (🔍)
OVAL: 🔍

X-Force: 70886
Vulnerability Center: 34514 - Linux Kernel ext4_ext_convert_to_initialized() Extents Splitting Local DoS Vulnerability, Medium
SecurityFocus: 50322 - Linux Kernel 'ext4_ext_insert_extent()' Local Denial of Service Vulnerability
Secunia: 46489 - Linux Kernel ext4 Extent Splitting Denial of Service Vulnerability, Not Critical

See also: 🔍

Entryinfo

Created: 11/21/2011 01:00
Updated: 03/19/2021 16:56
Changes: 11/21/2011 01:00 (78), 04/19/2017 10:51 (12), 03/19/2021 16:56 (2)
Complete: 🔍

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Might our Artificial Intelligence support you?

Check our Alexa App!