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Category:   Application (Web Server/CGI)  >   IBM iNotes and Domino Vendors:   IBM
IBM Lotus Domino 'tunekrnl' Buffer Overflow Lets Local Users Gain Root Privileges
SecurityTracker Alert ID:  1017198
SecurityTracker URL:
CVE Reference:   CVE-2006-5818   (Links to External Site)
Updated:  Jun 3 2008
Original Entry Date:  Nov 8 2006
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.x prior to 6.5.5 FP2, 7.x prior to 7.0.2
Description:   A vulnerability was reported in IBM Lotus Domino. A local user can obtain root privileges on the target system.

A local user can trigger a buffer overflow in the 'tunekrnl' binary to execute arbitrary commands on the target system with root privileges.

The vendor was notified on August 15, 2006.

Andrew Christensen of FortConsult ApS and iDefense reported this vulnerability.

Impact:   A local user can execute arbitrary code with root privileges on the target system.
Solution:   The vendor has issued fixed versions (6.5.5 FP2 and Domino 7.0.2).

The IBM advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 11.08.06: IBM Lotus Domino 7 tunekrnl

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 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.


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


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


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
FortConsult ApS.

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