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Message-ID: <46A911CA.9000703@idefense.com> Date: Thu, 26 Jul 2007 17:27:38 -0400 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 07.26.07: IBM AIX capture Terminal Control Sequence Buffer Overflow Vulnerability IBM AIX capture Terminal Control Sequence Buffer Overflow Vulnerability iDefense Security Advisory 07.26.07 http://labs.idefense.com/intelligence/vulnerabilities/ Jul 26, 2007 I. BACKGROUND The capture program is a setuid root application, installed by default under multiple versions of IBM AIX, that allows terminal sessions to be dumped to a file. More information can be found at the following URL. http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.cmds/doc/aixcmds1/capture.htm II. DESCRIPTION Local exploitation of a stack-based buffer overflow vulnerability in the 'capture' program, as included with IBM Corp.'s AIX operating system, allows an attacker to execute arbitrary code with root privileges. The vulnerability exists within the code that parses terminal control sequences. A long series of control sequences will trigger an exploitable stack-based buffer overflow. III. ANALYSIS Exploitation of this vulnerability results in the execution of arbitrary code with root privileges. The capture program is setuid root, and executable by any user with local access. The vulnerability is a stack-based buffer overflow, and is trivially exploitable. IV. DETECTION iDefense has confirmed the existence of this vulnerability in AIX version 5.3 with service pack 6. Previous versions may also be affected. V. WORKAROUND Removing the setuid bit from the binary will prevent exploitation, but may make the program unusable by non-root users. VI. VENDOR RESPONSE IBM Corp. has addressed this vulnerability by releasing interim fixes. More information can be found via the Bulletins tab of IBM's Subscription Service for UNIX and Linux servers. You can reach this service by clicking the URL shown below. http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd?mode=1 VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-3333 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 06/05/2007 Initial vendor notification 06/08/2007 Initial vendor response 07/26/2007 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 © 2007 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.
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