| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <4A144DD6.1090203@idefense.com> Date: Wed, 20 May 2009 13:37:10 -0500 From: iDefense Labs <labs-no-reply@...fense.com> To: vulnwatch@...nwatch.org, full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com Subject: iDefense Security Advisory 05.20.09: IBM AIX libc MALLOCDEBUG File Overwrite Vulnerability iDefense Security Advisory 05.19.09 http://labs.idefense.com/intelligence/vulnerabilities/ May 19, 2009 I. BACKGROUND IBM's AIX is a Unix operating system based on System V, which runs on the PowerPC (PPC) architecture. For more information, visit the product web site at the following URL. http://www.ibm.com/systems/power/software/aix/index.html II. DESCRIPTION Local exploitation of a file overwrite vulnerability in IBM Corp.'s Advanced Interactive eXecutive (AIX) could allow an attacker to overwrite arbitrary files and execute arbitrary code. The AIX libc implementation of malloc includes a debugging mechanism that is initiated by setting the MALLOCTYPE and MALLOCDEBUG environment variables. This debugging feature writes to a user-specified log file under certain conditions. There is a gap in time between the checks to see if the file is a symbolic link and the process of opening the file. If an attacker can change the file to be a symbolic link to another file within this time frame, it is possible to cause a set-uid binary to write to files owned by privileged users. III. ANALYSIS Exploitation of this issue allows an attacker to overwrite arbitrary files and execute arbitrary code as root. IV. DETECTION iDefense confirmed the existence of this vulnerability in IBM Corp.'s AIX version 5.3. Other versions may also be affected. V. WORKAROUND iDefense is currently unaware of any workaround for this issue. VI. VENDOR RESPONSE IBM has released a patch which addresses this issue. For more information, consult their advisory at the following URL: http://aix.software.ibm.com/aix/efixes/security/libc_advisory.asc VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 01/05/2008 - PoC Requested 12/16/2008 - Initial Response 12/16/2008 - Initial notification 01/06/2009 - PoC Sent 05/19/2009 - Coordinated public Disclosure IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2009 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@...fense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Powered by blists - more mailing lists