Linux Kernel fs/nfs/write.c information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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3.5$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel. This issue affects some unknown processing of the file fs/nfs/write.c. Executing a manipulation can lead to input validation. This vulnerability is tracked as CVE-2014-2038. No exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability classified as problematic was found in Linux Kernel (Operating System) (affected version unknown). This vulnerability affects an unknown functionality of the file fs/nfs/write.c. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

The nfs_can_extend_write function in fs/nfs/write.c in the Linux kernel before 3.13.3 relies on a write delegation to extend a write operation without a certain up-to-date verification, which allows local users to obtain sensitive information from kernel memory in opportunistic circumstances by writing to a file in an NFS filesystem and then reading the same file.

The weakness was disclosed 02/20/2014 by Scott Mayhew with Redhat as nfs: always make sure page is up-to-date before extending a write to cover the entire page as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2014-2038 since 02/19/2014. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 72900 (Ubuntu 12.04 LTS : linux-lts-saucy vulnerabilities (USN-2137-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 195756 (Ubuntu Security Notification for Linux-lts-saucy Vulnerabilities (USN-2137-1)).

Applying the patch Bug Fix is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

The vulnerability is also documented in the databases at X-Force (91307), Tenable (72900), SecurityFocus (BID 65688†) and Vulnerability Center (SBV-43881†). The entry VDB-66476 is pretty similar. 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: 4.0
VulDB Meta Temp Score: 3.5

VulDB Base Score: 4.0
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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: 72900
Nessus Name: Ubuntu 12.04 LTS : linux-lts-saucy vulnerabilities (USN-2137-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 841736
OpenVAS Name: Ubuntu Update for linux-lts-saucy USN-2137-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: Bug Fix

Timelineinfo

02/19/2014 🔍
02/20/2014 +1 days 🔍
02/20/2014 +0 days 🔍
02/20/2014 +0 days 🔍
02/26/2014 +6 days 🔍
02/28/2014 +2 days 🔍
04/03/2014 +34 days 🔍
04/12/2025 +4027 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: nfs: always make sure page is up-to-date before extending a write to cover the entire page
Researcher: Scott Mayhew
Organization: Redhat
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2014-2038 (🔍)
GCVE (CVE): GCVE-0-2014-2038
GCVE (VulDB): GCVE-100-12412

OVAL: 🔍

X-Force: 91307 - Linux Kernel fs/nfs/write.c information disclosure, Low Risk
SecurityFocus: 65688 - Linux Kernel NFS File System 'fs/nfs/write.c' Information Disclosure Vulnerability
Vulnerability Center: 43881 - Linux Kernel <3.13.3 Local information Disclosure in Write.c, Low

See also: 🔍

Entryinfo

Created: 02/26/2014 13:42
Updated: 04/12/2025 20:13
Changes: 02/26/2014 13:42 (76), 05/24/2017 10:58 (4), 06/09/2021 20:47 (3), 04/12/2025 20:13 (21)
Complete: 🔍
Committer:
Cache ID: 216:3BB:103

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