Linux Kernel 3.7.1 getaxttr System Call fs/nfs/nfs4proc.c _nfs4_get_acl_uncached memory corruption

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8.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel 3.7.1. It has been rated as problematic. This issue affects the function _nfs4_get_acl_uncached of the file fs/nfs/nfs4proc.c of the component getaxttr System Call. Performing a manipulation results in memory corruption. This vulnerability is known as CVE-2013-4591. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel 3.7.1 (Operating System). This affects the function _nfs4_get_acl_uncached of the file fs/nfs/nfs4proc.c of the component getaxttr System Call. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in the __nfs4_get_acl_uncached function in fs/nfs/nfs4proc.c in the Linux kernel before 3.7.2 allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via a getxattr system call for the system.nfs4_acl extended attribute of a pathname on an NFSv4 filesystem.

The weakness was published 12/11/2012 by Sachin Prabhu with Redhat as Linux kernel: kernel: nfs: missing check for buffer length in __nfs4_get_acl_uncached as confirmed advisory (Website). It is possible to read the advisory at openwall.com. The public release has been coordinated with Linux. This vulnerability is uniquely identified as CVE-2013-4591 since 06/12/2013. The exploitability is told to be difficult. Attacking locally is a requirement. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 71108 (Oracle Linux 6 : Kernel (ELSA-2013-1645)), 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 123695 (Red Hat Update for kernel (RHSA-2014:0284)).

Upgrading to version 3.7.2 eliminates this vulnerability. The upgrade is hosted for download at git.kernel.org. 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 upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (71108), SecurityFocus (BID 63791†), OSVDB (100003†), Secunia (SA55800†) and Vulnerability Center (SBV-42329†). Further details are available at seclists.org. Similar entries are available at VDB-11234 and VDB-11508. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.3
VulDB Meta Temp Score: 8.9

VulDB Base Score: 9.3
VulDB Temp Score: 8.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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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: 71108
Nessus Name: Oracle Linux 6 : Kernel (ELSA-2013-1645)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Kernel 3.7.2
Patch: git.kernel.org

Timelineinfo

12/11/2012 🔍
12/11/2012 +0 days 🔍
06/12/2013 +183 days 🔍
11/19/2013 +160 days 🔍
11/20/2013 +1 days 🔍
11/25/2013 +5 days 🔍
06/02/2021 +2746 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: Linux kernel: kernel: nfs: missing check for buffer length in __nfs4_get_acl_uncached
Researcher: Sachin Prabhu
Organization: Redhat
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2013-4591 (🔍)
GCVE (CVE): GCVE-0-2013-4591
GCVE (VulDB): GCVE-100-11235

OVAL: 🔍

SecurityFocus: 63791
Secunia: 55800 - Red Hat update for kernel, Less Critical
OSVDB: 100003
Vulnerability Center: 42329 - Linux Kernel Local Buffer Overflow Vulnerability in the \x27__nfs4_get_acl_uncached()\x27 Function, High

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 11/25/2013 08:37
Updated: 06/02/2021 12:30
Changes: 11/25/2013 08:37 (79), 05/15/2017 11:41 (1), 06/02/2021 12:30 (3)
Complete: 🔍
Committer:
Cache ID: 216:979:103

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