Linux Kernel prior 2.6.31-rc6 NSF O_Direct Implementation null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel. It has been rated as problematic. Affected by this vulnerability is an unknown functionality of the component NSF O_Direct Implementation. This manipulation causes null pointer dereference. This vulnerability appears as CVE-2011-4325. There is no available exploit. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown function of the component NSF O_Direct Implementation. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

The NFS implementation in Linux kernel before 2.6.31-rc6 calls certain functions without properly initializing certain data, which allows local users to cause a denial of service (NULL pointer dereference and O_DIRECT oops), as demonstrated using diotest4 from LTP.

The weakness was presented 01/10/2012 (Website). It is possible to read the advisory at rhn.redhat.com. The public release was coordinated in cooperation with Linux. This vulnerability is known as CVE-2011-4325 since 11/04/2011. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 57485 (CentOS 5 : kernel (CESA-2012:0007)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 120013 (CentOS Security Update for Kernel (CESA-2012:0007)).

Upgrading to version 2.6.31-rc6 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 immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (72297), Tenable (57485), SecurityFocus (BID 51366†), OSVDB (78301†) and Secunia (SA36617†). See VDB-4544, VDB-4545, VDB-61072 and VDB-60026 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 5.4

VulDB Base Score: 6.2
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 57485
Nessus Name: CentOS 5 : kernel (CESA-2012:0007)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 881222
OpenVAS Name: CentOS Update for kernel CESA-2012:0007 centos5
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 2.6.31-rc6
Patch: git.kernel.org

Timelineinfo

09/08/2009 🔍
11/04/2011 +787 days 🔍
01/10/2012 +67 days 🔍
01/10/2012 +0 days 🔍
01/11/2012 +1 days 🔍
01/15/2012 +4 days 🔍
01/21/2012 +5 days 🔍
01/27/2012 +6 days 🔍
01/27/2012 +0 days 🔍
02/08/2012 +12 days 🔍
03/20/2021 +3328 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: rhn.redhat.com
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2011-4325 (🔍)
GCVE (CVE): GCVE-0-2011-4325
GCVE (VulDB): GCVE-100-4543

OVAL: 🔍
IAVM: 🔍

X-Force: 72297 - Linux Kernel NFS denial of service, Medium Risk
SecurityFocus: 51366 - Linux Kernel NFS Implementation CVE-2011-4325 Local Denial of Service Vulnerability
Secunia: 36617 - Linux Kernel Two Vulnerabilities, Not Critical
OSVDB: 78301
Vulnerability Center: 34413 - Linux kernel < 2.6.31-rc6 NFS Implementation Allows Local NULL Pointer Dereference Vulnerability, Medium

See also: 🔍

Entryinfo

Created: 01/21/2012 01:00
Updated: 03/20/2021 13:53
Changes: 01/21/2012 01:00 (79), 04/09/2017 14:32 (9), 03/20/2021 13:53 (3)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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