Date: 18 July 2007
Click here for printable version
Click here for PGP verifiable version
-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
ESB-2007.0533 -- [Win][UNIX/Linux][Solaris][AIX][OSX]
IBM Tivoli Provisioning Manager for OS Deployment TFTP
Blocksize DoS Vulnerability
18 July 2007
AusCERT Security Bulletin Summary
Product: IBM Tivoli Provisioning Manager
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact: Denial of Service
CVE Names: CVE-2007-3268
- --------------------------BEGIN INCLUDED TEXT--------------------
IBM Tivoli Provisioning Manager for OS Deployment TFTP Blocksize DoS
iDefense Security Advisory 07.17.07
Jul 17, 2007
IBM Corp.'s Tivoli Provisioning Manager for OS Deployment is a network
boot server that facilitates central management of networked
workstations. It implements Preboot Execution Environment (PXE), a
Web-based administration service, DHCP, TFTP, and several additional
protocols. More information can be found at the following URL.
Remote exploitation of a denial of service vulnerability within version
18.104.22.168 of IBM Corp.'s Tivoli Provisioning Manager for OS Deployment
allows attackers to deny service to all product functionality.
This vulnerability specifically exists in the TFTP protocol
implementation. When processing a read request (RRQ), an integer
division by zero error can be triggered by supplying an invalid
"blksize" argument. This exception is not handled and will result in
the rembo.exe service terminating.
Exploitation allows an attacker to cause the service to terminate
unexpectedly due to an exception that occurs when dividing by zero.
No authentication is required to access the vulnerable code. The
attacker need only be able to send a specially crafted request to the
TFTP port (UDP port 69) of the vulnerable machine.
This will deny service to all functionality provided by this service.
This includes DHCP, TFTP, PXE, HTTP, HTTPS, as well as several other
iDefense has confirmed the existence of this vulnerability in version
22.214.171.124 of IBM Corp.'s Tivoli Provisioning Manager for OS Deployment.
Version 126.96.36.199 was tested and found not to be vulnerable.
Employing firewalls to limit access to the affected service will
mitigate exposure to this vulnerability.
VI. VENDOR RESPONSE
The IBM Tivoli team has addressed this vulnerability within Tivoli
Provisioning Manager for OS Deployment 5.1 Fix Pack 3. More information
is available from IBM Document swg24016347 at the following URL.
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3268 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
06/19/2007 Initial vendor notification
06/19/2007 Initial vendor response
07/17/2007 Coordinated public disclosure
This vulnerability was reported to iDefense by Manuel Santamarina
Get paid for vulnerability research
Free tools, research and upcoming events
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 email@example.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.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to firstname.lastname@example.org
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: email@example.com
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
-----BEGIN PGP SIGNATURE-----
-----END PGP SIGNATURE-----