IBM AIX SGID bit NFSv4 denial of service

aix-nfsv4-sgid-dos (78431) The risk level is classified as MediumMedium Risk

Description:

IBM AIX is vulnerable to a denial of service, caused by an error when the SGID bit is set in an NFSv4 directory. A remote attacker could exploit this vulnerability to cause the consumption of disk space.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to IBM SECURITY ADVISORY nfsv4_advisory1.asc for patch, upgrade or suggested workaround information. See References.

References:

  • IBM SECURITY ADVISORY nfsv4_advisory1.asc: GID in NFSv4 is loosely enforced.
  • BID-55546: IBM AIX GID in NFSv4 Remote Denial of Service Vulnerability
  • CVE-2012-4817: 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.
  • OSVDB ID: 85427: IBM AIX NFS Service GID Enforcement Weakness Remote DoS
  • SA50619: IBM AIX NFS GID Enforcement Denial of Service Vulnerability

Platforms Affected:

  • IBM AIX 5.3
  • IBM AIX 6.1
  • IBM AIX 7.1

Reported:

Sep 13, 2012

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* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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