IBM Lotus Domino 7 tunekrnl Multiple Vulnerabilities
iDefense Security Advisory 11.08.06
Nov 08, 2006
IBM Lotus Domino is a software suite designed to facilitate collaboration
between co-workers. More information can be found at
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.
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.
iDefense has confirmed the existence of this vulnerability in version
126.96.36.199 of IBM's Lotus Domino for Linux. Earlier versions may also be
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
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
This vulnerability was reported to iDefense by Andrew Christensen of
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Copyright =A9 2006 iDefense, Inc.
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