IBM AIX MALLOCDEBUG symlink

aix-mallocdebug-symlink (50636) The risk level is classified as MediumMedium Risk

Description:

IBM AIX could allow a local attacker to launch a symlink attack. The malloc subsystem in libc creates temporary files insecurely. A local attacker could exploit this vulnerability by creating a symbolic link from a temporary file to the log file associated with the MALLOCDEBUG environment variable, which could allow the attacker to overwrite arbitrary files on the system with elevated privileges.

*CVSS:

Base Score: 3.3
  Access Vector: Local
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 2.9
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

File Manipulation

Remedy:

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

References:

  • IBM SECURITY ADVISORY: AIX libc MALLOCDEBUG file overwrite vulnerability.
  • iDefense PUBLIC ADVISORY: 05.20.09: IBM AIX libc MALLOCDEBUG File Overwrite Vulnerability.
  • BID-35034: IBM AIX 'MALLOCDEBUG' File Overwrite Vulnerability
  • CVE-2009-1786: The malloc subsystem in libc in IBM AIX 5.3 and 6.1 allows local users to create or overwrite arbitrary files via a symlink attack on the log file associated with the MALLOCDEBUG environment variable.
  • OSVDB ID: 54617: IBM AIX libc MALLOCDEBUG Environment Variable Local Privilege Escalation
  • SA35146: IBM AIX libc MALLOCDEBUG Privilege Escalation Vulnerability
  • SECTRACK ID: 1022261: IBM AIX libc MALLOCDEBUG File Overwrite Bug Lets Local Users Gain Root Privileges

Platforms Affected:

  • IBM AIX 5.3
  • IBM AIX 6.1

Reported:

May 19, 2009

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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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