IBM Lotus Domino 7 tunekrnl Multiple Vulnerabilities iDefense Security Advisory 11.08.06 http://labs.idefense.com/intelligence/vulnerabilities/ Nov 08, 2006 I. BACKGROUND IBM Lotus Domino is a software suite designed to facilitate collaboration between co-workers. More information can be found at http://www.ibm.com/domino/. II. DESCRIPTION Local exploitation of multiple buffer overflow vulnerabilities in IBM's Lotus Domino could allow an attacker to elevate privileges to root. The 'tunekrnl' binary is used to set Linux/proc sysctl settings, allowing Domino to increase the resource limits of the running kernel. It is shipped with the owner set to root and the set-user-id bit on. Since the length of input is improperly validated when copying to fixed-size buffers, buffer overflow can occur. III. ANALYSIS Exploitation could allow local attackers to elevate their privileges to that of the 'root' account. On most modern systems, this means that attackers would gain complete control over the target system. IV. DETECTION iDefense has confirmed the existence of this vulnerability in version 220.127.116.11 of IBM's Lotus Domino for Linux. Earlier versions may also be vulnerable. V. WORKAROUND To prevent exploitation, rename or delete the /etc/SuSE-release or /etc/redhat-release file. The 'tunekrnl' binary's vulnerable code is not executed if this file does not exist. Also, removing the set-user-id bit from the 'tunekrnl' binary prevents privilege escalation. However, this may require running the utility as root manually to increase system resource limits as needed. VI. VENDOR RESPONSE IBM Lotus has addressed this problem within Domino versions 6.5.5 FP2 and 7.0.2. More information is available in IBM Technote #1249173 at http://www-1.ibm.com/support/docview.wss?rs=475&uid=swg21249173. VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 08/15/2006 Initial vendor notification 08/15/2006 Initial vendor response 11/08/2006 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by Andrew Christensen of FortConsult ApS. 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 © 2006 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@private 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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