ID: 3262
Date: 23 July 2007 12:13
Title: iDefense Security Advisory concerning IBM Tivoli Provisioning Manager
Abstract: Remote exploitation of a denial of service vulnerability within version 5.1.0.2 of IBM Tivoli Provisioning Manager for OS Deployment allows attackers to deny service to all product functionality
Vendors affected:IBM
Availability of fix: Available
Type of fix: Patch
IBM Tivoli Provisioning Manager for OS Deployment TFTP Blocksize DoS
Vulnerability
iDefense Security Advisory 07.17.07
http://labs.idefense.com/intelligence/vulnerabilities/
Jul 17, 2007
I. BACKGROUND
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.
http://www-306.ibm.com/software/tivoli/products/prov-mgr-os-deploy/
II. DESCRIPTION
Remote exploitation of a denial of service vulnerability within version
5.1.0.2 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.
III. ANALYSIS
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 services.
IV. DETECTION
iDefense has confirmed the existence of this vulnerability in version
5.1.0.2 of IBM Corp.'s Tivoli Provisioning Manager for OS Deployment.
Version 5.1.0.116 was tested and found not to be vulnerable.
V. WORKAROUND
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.
http://www-1.ibm.com/support/docview.wss?uid=swg24016347
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 security problems.
VIII. DISCLOSURE TIMELINE
06/19/2007 Initial vendor notification
06/19/2007 Initial vendor response
07/17/2007 Coordinated public disclosure
IX. CREDIT
This vulnerability was reported to iDefense by Manuel Santamarina Suarez.
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http://labs.idefense.com/methodology/vulnerability/vcp.php
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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
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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.
___________________________________________________________________________
CPNI wishes to acknowledge the contributions of iDefense and IBM
for the information contained in this advisory.
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