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              AUSCERT External Security Bulletin Redistribution
                             
    ESB-1999.167 --  Re-release of Microsoft Security Bulletin (MS99-042)
           Patch available for "IFRAME ExecCommand" Vulnerability
                              08 November 1999

===========================================================================

Microsoft Corporation has released the following security bulletin
concerning a vulnerability in an IE5 Active Scripting method called
'ExecCommand'.  If ExecCommand is executed from within an IFRAME, some 
normal security checks are not performed.  This may allow a malicious web 
site operator to read files on the visiting browser's computer.  A 
workaround has been provided by Microsoft to eliminate this vulnerability.

However, Microsoft has subsequently determined that the patch released 
contained a regression error.  While the patch did provide protection 
against the "IFRAME ExecCommand" vulnerability, it re-exposed a 
previously-patched security vulnerability.  The "IFRAME ExecCommand" patch 
has been re-released to correct the regression error:

       http://www.microsoft.com/security/bulletins/ms99-042.asp


===========================================================================

This security bulletin is provided as a service to AusCERT's members.
As AusCERT did not write the document referenced above, AusCERT has
had no control over its content.  The decision to use any or all
of this information is the responsibility of each user or organisation,
and should be done so in accordance with site policies and procedures.

If you have any questions or need further information, please contact 
Microsoft Corporation directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
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 emergencies.


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