Public Vulnerability Reports

IBM Lotus Domino 7 tunekrnl Multiple Vulnerabilities

11.08.06

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/.

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.

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.

DETECTION

iDefense has confirmed the existence of this vulnerability in version 7.0.1.1 of IBM's Lotus Domino for Linux. Earlier versions may also be vulnerable.

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.

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.

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

08/15/2006 Initial vendor notification
08/15/2006 Initial vendor response
11/08/2006 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by Andrew Christensen of FortConsult ApS.

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Copyright © 2006 Verisign, Inc.

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