Linux Kernel 2.6.28.2 tty_fasync race condition

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

A vulnerability has been found in Linux Kernel 2.6.28.2 (Operating System) and classified as critical. This vulnerability affects the function tty_fasync. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect availability. CVE summarizes:

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

The issue has been introduced in 12/25/2008. The weakness was shared 09/08/2010 by Dan Rosenberg as Bug 559100 as not defined bug report (Bugzilla). The advisory is available at bugzilla.redhat.com. This vulnerability was named CVE-2009-4895. 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 was handled as a non-public zero-day exploit for at least 622 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 50044 (Ubuntu 6.06 LTS / 8.04 LTS / 9.04 / 9.10 / 10.04 LTS / 10.10 : linux, linux-ec2, linux-source-2.6.15 vulnerabilities (USN-1000-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks.

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 (50044). The entry 54605 is related to this item.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.2
VulDB Temp Score: 6.2
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VulDB Reliability: 🔍

CVSSv2info

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Exploitinginfo

Class: Race condition
CWE: CWE-362
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

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Current Price Estimation: 🔍

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Nessus ID: 50044
Nessus Name: Ubuntu 6.06 LTS / 8.04 LTS / 9.04 / 9.10 / 10.04 LTS / 10.10 : linux, linux-ec2, linux-source-2.6.15 vulnerabilities (USN-1000-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 67981
OpenVAS Name: Debian Security Advisory DSA 2094-1 (linux-2.6)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: 703625118069f9f8960d356676662d3db5a9d116

Timelineinfo

12/25/2008 🔍
06/15/2010 +536 days 🔍
06/17/2010 +2 days 🔍
08/31/2010 +75 days 🔍
09/02/2010 +2 days 🔍
09/08/2010 +6 days 🔍
09/08/2010 +0 days 🔍
10/20/2010 +42 days 🔍
03/19/2015 +1611 days 🔍
09/24/2021 +2381 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: Bug 559100
Researcher: Dan Rosenberg
Status: Not defined
Confirmation: 🔍

CVE: CVE-2009-4895 (🔍)
OVAL: 🔍

Vulnerability Center: 26969 - Linux Kernel tty Subsystem Allows Local Denial of Service, Low
SecurityFocus: 40920 - Linux Kernel XSF 'SWAPEXT' IOCTL Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 03/19/2015 14:37
Updated: 09/24/2021 13:46
Changes: 03/19/2015 14:37 (63), 03/03/2017 09:50 (10), 09/24/2021 13:41 (6), 09/24/2021 13:46 (1)
Complete: 🔍

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