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.
8.4	$0-$5k	0.00

A vulnerability classified as critical was found in Linux Kernel 2.6.23 (Operating System). This vulnerability affects the function fasync_helper. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Use-after-free vulnerability in the fasync_helper function in fs/fcntl.c in the Linux kernel before 2.6.33-rc4-git1 allows local users to gain privileges via vectors that include enabling O_ASYNC (aka FASYNC or FIOASYNC) on a locked file, and then closing this file.

The issue has been introduced in 10/09/2007. The weakness was released 01/19/2010 by Tavis Ormandy (Website). The advisory is shared for download at kernel.org. This vulnerability was named CVE-2009-4141. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/31/2021).

The vulnerability was handled as a non-public zero-day exploit for at least 833 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 47258 (Fedora 11 : kernel-2.6.30.10-105.2.13.fc11 (2010-1500)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 155737 (Oracle Enterprise Linux Update for Kernel (ELSA-2010-0046)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (47258).

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 2.6.23

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: 8.4
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.4
VulDB Temp Score: 8.4
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: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 47258
Nessus Name: Fedora 11 : kernel-2.6.30.10-105.2.13.fc11 (2010-1500)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 880643
OpenVAS Name: CentOS Update for kernel CESA-2010:0046 centos5 i386
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/09/2007 🔍
12/01/2009 +783 days 🔍
12/16/2009 +15 days 🔍
01/14/2010 +29 days 🔍
01/17/2010 +3 days 🔍
01/19/2010 +2 days 🔍
01/19/2010 +0 days 🔍
07/01/2010 +163 days 🔍
03/18/2015 +1721 days 🔍
08/31/2021 +2358 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: kernel.org
Researcher: Tavis Ormandy
Status: Not defined
Confirmation: 🔍

CVE: CVE-2009-4141 (🔍)
OVAL: 🔍
IAVM: 🔍

Vulnerability Center: 24610 - Linux Kernel 2.6.28 Before 2.6.33-rc4-git1 Local Arbitrary Code Execution via Fasync_helper(), High
SecurityFocus: 37806 - Linux Kernel 'fasync_helper()' Local Privilege Escalation Vulnerability

Entryinfo

Created: 03/18/2015 15:15
Updated: 08/31/2021 11:09
Changes: 03/18/2015 15:15 (67), 02/20/2017 10:04 (9), 08/31/2021 11:04 (4), 08/31/2021 11:09 (1)
Complete: 🔍
Cache ID: 18:108:103

Discussion

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