Attachment 15497 Details for Bug 15222 – Record vulnerabilites draft advisory

Record vulnerabilites draft advisory

ltiple Vendor X Server Record and Security Extensions Multiple Memory Corruption Vulnerabilities.txt (text/plain), 3.76 KB, created by Matthieu Herrb on 2008-03-27 03:35:48 UTC

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Creator: Matthieu Herrb

Created: 2008-03-27 03:35:48 UTC

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>iDefense Security Advisory XX.XX.XX
>http://labs.idefense.com/intelligence/vulnerabilities/
>MMM DD, YYYY
>
>I. BACKGROUND
>
>The X Window System is a graphical windowing system based on a
>client/server model. More information about about The X Window system
>is available at the following links.
>
>http://en.wikipedia.org/wiki/X_Window_System
>
>II. DESCRIPTION
>
>Local exploitation of multiple memory corruption vulnerabilities in the
>X.Org X server, as included in various vendors' operating system
>distributions, could allow an attacker to execute arbitrary code with
>the privileges of the X server, typically root.
>
>Multiple vulnerabilities are present in the Record and Security
>extensions. In both cases, untrusted values are taken from a client
>request, and used to swap the byte order of heap memory that follows
>the client request. Since the number of bytes to swap is not properly
>validated, it is possible to corrupt heap memory located after the
>request. The following functions contain vulnerable code:
>
>SProcSecurityGenerateAuthorization() SProcRecordCreateContext()
>SProcRecordRegisterClients()
>
>III. ANALYSIS
>
>Exploitation allows an attacker to execute arbitrary code with the
>privileges of the X server, typically root. In order to exploit these
>vulnerabilities, an attacker must be able to send commands to an
>affected X server. This typically requires access to the console or
>access to the same account as a user who is on the console. One method
>of gaining the required access is to remotely exploit a vulnerability
>in, for example, a graphical web browser. This would then allow an
>attacker to exploit this vulnerability and elevate their privileges to
>root.
>
>If an X Server is configured to listen for TCP based client connections,
>and a client is granted access to create sessions (via the xhosts file),
>then these vulnerabilities can be exploited remotely.
>
>IV. DETECTION
>
>iDefense has confirmed the existence of these vulnerabilities in X.org
>X11 version R7.3, with all patches as of 03/01/08 applied. Previous
>versions may also be affected.
>
>V. WORKAROUND
>
>Access to the vulnerable code in the SECURITY extension can be prevented
>by preventing the X server from loading the extension. However, doing so
>may seriously impair the functionality of the server. Adding the
>following lines to the X configuration file will disable the SECURITY
>extension:
>
>Section "Extensions"   Option "SECURITY" "disable" EndSection
>
>VI. VENDOR RESPONSE
>
>iDefense is currently working with the vendor to address these issues.
>Since there is no vendor fix at this time, please handle this
>information with sensitivity.
>
>VII. CVE INFORMATION
>
>A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
>been assigned yet.
>
>VIII. DISCLOSURE TIMELINE
>
>XX/XX/XXXX  Initial vendor notification
>
>IX. CREDIT
>
>This vulnerability was reported to iDefense by regenrecht.
>
>Get paid for vulnerability research
>http://labs.idefense.com/methodology/vulnerability/vcp.php
>
>Free tools, research and upcoming events
>http://labs.idefense.com/
>
>X. LEGAL NOTICES
>
>Copyright © 2008 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 customerservice@idefense.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.

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