IBM AIX Kernel Memory Leak / Denial Of Service

Credit: Tim Brown
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-noinfo

CVSS Base Score: 4.7/10
Impact Subscore: 6.9/10
Exploitability Subscore: 3.4/10
Exploit range: Local
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Complete

Vulnerability title: Kernel Memory Leak And Denial Of Service Condition in IBM AIX CVE: CVE-2014-0930 Vendor: IBM Product: AIX Affected version: 5.3, 6.1 and 7.1 releases VIOS 2.2.* Fixed version: Interim version Reported by: Tim Brown Details: It has been identified that the ptrace() system call can be manipulated by an unprivileged user into leaking uninitialised kernel memory and that the method by which this is achieved may also lead to a denial of service condition. This can be achieved by manipulating the parameters that are passed to the ptrace() system call when performing the PT_LDINFO operation. By calling ptrace(PT_LDINFO, childpid, leakbuffer, maximumleak, NULL) with a value of maximumleak that greater than that required for the expected result of the PT_LDINFO operation, the AIX kernel will xmalloc() this space (without initialising it), populate it and then perform a copy operation that returns the result within leakbuffer. Further details at: Copyright: Copyright (c) Portcullis Computer Security Limited 2014, All rights reserved worldwide. Permission is hereby granted for the electronic redistribution of this information. It is not to be edited or altered in any way without the express written consent of Portcullis Computer Security Limited. Disclaimer: The information herein contained 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 the author/distributor (Portcullis Computer Security Limited) 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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