Security Advisory SA38199 - Linux Kernel FASYNC Use-After-Free Privilege Escalation Vulnerability

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Secunia Advisory SA38199

Linux Kernel FASYNC Use-After-Free Privilege Escalation Vulnerability

Secunia Advisory

SA38199

Release Date

2010-01-14

Last Update

2010-01-19

Popularity

6,573 views

Comments

0 comments

Criticality level

Less critical

Impact

Privilege escalation

Where

Local system

Authentication level

This information is available to Secunia VIM customers

Report reliability

This information is available to Secunia VIM customers

Solution Status

Vendor Patch

3rd party PoC/exploit

Link available in Customer Area

Systems affected

This information is available to Secunia VIM customers

Approve distribution

This information is available to Secunia VIM customers

Remediation status

Secunia CSI, Secunia PSI

Automated scanning

Secunia CSI, Secunia PSI

Operating System

Linux Kernel 2.6.x

Secunia CVSS Score

This information is available to Secunia VIM Customers

CVE Reference(s)

CVE-2009-4141 CVSS score available to Secunia VIM customers

Description

A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious, local users to gain escalated privileges.

The vulnerability is caused due to a use-after-free error within the handling of file descriptors with the FASYNC flag set. This can be exploited to e.g. cause a crash or execute arbitrary code with kernel privileges.

The vulnerability is reported in version 2.6.28 and later.

Solution
Update to version 2.6.31.12 or 2.6.32.4.

Provided and/or discovered by
Tavis Ormandy, Google.

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://archives.neohapsis.com/archives/fulldisclosure/2010-01/0252.html

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=log;h=53281b6d34d44308372d16acb7fb5327609f68b6

Deep Links
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Linux Kernel FASYNC Use-After-Free Privilege Escalation Vulnerability

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Secunia Advisory SA38199

Linux Kernel FASYNC Use-After-Free Privilege Escalation Vulnerability

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