Linux Kernel prior 3.3.1 fs/jbd2/transaction.c journal_unmap_buffer memory corruption

CVSS Meta Temp Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel. This affects the function journal_unmap_buffer of the file fs/jbd2/transaction.c. Such manipulation leads to memory corruption. This vulnerability is listed as CVE-2011-4086. There is no available exploit. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel (Operating System). Affected by this issue is the function journal_unmap_buffer of the file fs/jbd2/transaction.c. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is availability. CVE summarizes:

The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the _Delay and _Unwritten buffer head states, which allows local users to cause a denial of service (system crash) by leveraging the presence of an ext4 filesystem that was mounted with a journal.

The weakness was presented 02/09/2012 with Red Hat Security Response Team (Website). The advisory is shared for download at secunia.com. This vulnerability is handled as CVE-2011-4086 since 10/18/2011. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 68526 (Oracle Linux 6 : kernel (ELSA-2012-0571)), 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 156330 (Oracle Enterprise Linux Update for Kernel (ELSA-2012-0571)).

Upgrading to version 3.3.1 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 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (73099), Tenable (68526), SecurityFocus (BID 51945†), OSVDB (79097†) and Secunia (SA47967†). Once again VulDB remains the best 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: 5.9

VulDB Base Score: 6.2
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 68526
Nessus Name: Oracle Linux 6 : kernel (ELSA-2012-0571)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 892469
OpenVAS Name: Debian Security Advisory DSA 2469-1 (linux-2.6 - privilege escalation/denial of service
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 3.3.1
Patch: git.kernel.org

Timelineinfo

10/18/2011 🔍
02/09/2012 +114 days 🔍
02/09/2012 +0 days 🔍
02/09/2012 +0 days 🔍
02/21/2012 +12 days 🔍
02/24/2012 +3 days 🔍
04/02/2012 +38 days 🔍
07/03/2012 +92 days 🔍
07/12/2013 +374 days 🔍
03/20/2021 +2808 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: secunia.com⛔
Organization: Red Hat Security Response Team
Status: Not defined
Confirmation: 🔍

CVE: CVE-2011-4086 (🔍)
GCVE (CVE): GCVE-0-2011-4086
GCVE (VulDB): GCVE-100-4628

OVAL: 🔍

X-Force: 73099
SecurityFocus: 51945 - Linux Kernel 'journal_unmap_buffer()' Local Denial of Service Vulnerability
Secunia: 47967 - Red Hat update for kernel, Less Critical
OSVDB: 79097
Vulnerability Center: 34515 - Linux Kernel journal_unmap_buffer() Buffer Head States Local DoS, Medium

Entryinfo

Created: 02/24/2012 01:00
Updated: 03/20/2021 18:27
Changes: 02/24/2012 01:00 (81), 08/18/2017 13:50 (3), 03/20/2021 18:27 (3)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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