IBM AIX 5.3/6.1/7.1 NFS Service denial of service

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

A vulnerability was found in IBM AIX 5.3/6.1/7.1 (Operating System). It has been declared as problematic. This vulnerability affects an unknown code block of the component NFS Service. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

The NFSv4 client implementation in IBM AIX 5.3, 6.1, and 7.1, and VIOS before 2.2.1.4-FP-25 SP-02, does not properly handle GID values, which allows remote attackers to cause a denial of service via unspecified vectors.

The issue has been introduced in 08/01/2004. The weakness was presented 09/13/2012 as nfsv4_advisory1 as confirmed advisory (Website). The advisory is available at aix.software.ibm.com. The public release was coordinated in cooperation with the vendor. This vulnerability was named CVE-2012-4817 since 09/06/2012. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. GID in NFSv4 is loosely enforced.

The vulnerability was handled as a non-public zero-day exploit for at least 2965 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 63735 (AIX 7.1 TL 0 : nfsv4 (IV26436)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family AIX Local Security Checks.

Applying the patch nfsv4_fix1.tar is able to eliminate this problem. The bugfix is ready for download at aix.software.ibm.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (78431) and Tenable (63735).

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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Exploitinginfo

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

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EPSS Percentile: 🔍

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Current Price Estimation: 🔍

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Nessus ID: 63735
Nessus Name: AIX 7.1 TL 0 : nfsv4 (IV26436)
Nessus File: 🔍
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Nessus Port: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Patch: nfsv4_fix1.tar

Timelineinfo

08/01/2004 🔍
09/06/2012 +2958 days 🔍
09/13/2012 +7 days 🔍
09/13/2012 +0 days 🔍
09/13/2012 +0 days 🔍
09/14/2012 +1 days 🔍
09/14/2012 +0 days 🔍
09/14/2012 +0 days 🔍
09/14/2012 +0 days 🔍
09/14/2012 +0 days 🔍
09/16/2012 +2 days 🔍
09/17/2012 +1 days 🔍
01/24/2013 +129 days 🔍
04/13/2021 +3001 days 🔍

Sourcesinfo

Vendor: ibm.com

Advisory: nfsv4_advisory1
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2012-4817 (🔍)
OVAL: 🔍
IAVM: 🔍

X-Force: 78431 - IBM AIX SGID bit NFSv4 denial of service, Medium Risk
SecurityTracker: 1027531 - IBM AIX NFSv4 GID Enforcement Flaw Lets Remote Users Deny Service
Vulnerability Center: 36132 - IBM AIX 5.3, 6.1, and 7.1 NFSv4 Client Remote DoS Vulnerability, High
SecurityFocus: 55546 - IBM AIX GID in NFSv4 Remote Denial of Service Vulnerability
Secunia: 50619 - IBM AIX NFS GID Enforcement Denial of Service Vulnerability, Less Critical
OSVDB: 85427

Entryinfo

Created: 09/17/2012 17:18
Updated: 04/13/2021 07:26
Changes: 09/17/2012 17:18 (83), 04/17/2017 10:52 (12), 04/13/2021 07:26 (3)
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