Linux Kernel 2.6.14.4 nfs2acl.c access control

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel 2.6.14.4. It has been declared as critical. The affected element is an unknown function of the file nfs2acl.c. Executing a manipulation can lead to access control. This vulnerability is registered as CVE-2005-3623. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel 2.6.14.4 (Operating System). It has been declared as critical. This vulnerability affects some unknown processing of the file nfs2acl.c. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality. CVE summarizes:

nfs2acl.c in the Linux kernel 2.6.14.4 does not check for MAY_SATTR privilege before setting access controls (ACL) on files on exported NFS filesystems, which allows remote attackers to bypass ACLs for readonly mounted NFS filesystems.

The bug was discovered 02/09/2006. The weakness was published 12/31/2005 by Martin (Website). The advisory is shared for download at secunia.com. This vulnerability was named CVE-2005-3623 since 11/16/2005. The exploitation appears to be easy. The attack can be initiated remotely. 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 T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 65 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 22276 (CentOS 4 : kernel (CESA-2006:0575)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115389 (Linux Kernel Unspecified Socket Buffer Handling Remote Denial of Service Vulnerability).

Upgrading to version 2.6.14.4 eliminates this vulnerability. A possible mitigation has been published 9 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (25323), Tenable (22276), SecurityFocus (BID 16570†), OSVDB (22179†) and Secunia (SA18788†). Similar entries are available at VDB-2071, VDB-30335, VDB-30129 and VDB-30059. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 22276
Nessus Name: CentOS 4 : kernel (CESA-2006:0575)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 65026
OpenVAS Name: SLES9: Security update for Linux kernel
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Kernel 2.6.14.4

Timelineinfo

10/27/2005 🔍
11/16/2005 +20 days 🔍
12/31/2005 +45 days 🔍
12/31/2005 +0 days 🔍
12/31/2005 +0 days 🔍
02/09/2006 +40 days 🔍
02/09/2006 +0 days 🔍
02/10/2006 +1 days 🔍
02/23/2006 +13 days 🔍
08/23/2006 +181 days 🔍
08/30/2006 +7 days 🔍
03/12/2015 +3116 days 🔍
06/21/2025 +3754 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: secunia.com⛔
Researcher: Martin
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2005-3623 (🔍)
GCVE (CVE): GCVE-0-2005-3623
GCVE (VulDB): GCVE-100-27880

OVAL: 🔍

X-Force: 25323
SecurityFocus: 16570 - Linux Kernel NFS ACL Access Control Bypass Vulnerability
Secunia: 18788 - SUSE update for kernel, Moderately Critical
OSVDB: 22179 - CVE-2005-3623 - Linux - Security Bypass Issue
Vulnerability Center: 10440 - Linux Kernel 2.6.14.4 Allows Remote Users to Set ACLs on Read Only Exported NFS Filesystems, High

See also: 🔍

Entryinfo

Created: 03/12/2015 11:11
Updated: 06/21/2025 22:53
Changes: 03/12/2015 11:11 (79), 06/14/2019 15:04 (8), 06/21/2025 22:53 (20)
Complete: 🔍
Cache ID: 216:401:103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!