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AusCERT Update AU-2004.0015 - New viruses actively exploiting Internet Explorer IFRAME Buffer Overflow Vulnerability
9 November 2004

        AusCERT Update Summary
        ----------------------

Product:           Microsoft Internet Explorer
Operating System:  Windows
Impact:            Execute Arbitrary Code/Commands

Ref:               AL-2004.038



Further to the Internet Explorer IFRAME buffer overflow vulnerability
described in AusCERT Alert AL-2004.038, 2 viruses have been released 
actively exploiting this vulnerability.

Infection occurs via clicking a link in an email which links to a web page
containing exploit code.

These viruses use javascript to exploit the vulnerability outlined in 
AL-2004.038. Therefore AusCERT advises users to review the steps outlined in 
the MITIGATION section of alert AL-2004.038 which is available from 
http://www.auscert.org.au/4527, specifically the sections regarding disabling 
active scripting in Internet Explorer.

While disabling scripting will prevent infection from these particular viruses, 
the underlying vulnerability still exists and may be exploitable without the use 
of scripting.

Further information on these viruses can be obtained from the following sources [1],
[2],[3].

REFERENCES:

	[1] F-Prot Antivirus
	    http://www.f-prot.com/virusinfo/descriptions/mydoom_ah.html
	
	[2] McAfee Antivirus - W32/MyDoom.ag@mm
	    http://us.mcafee.com/virusInfo/default.asp?id=description&virus_k=129630

        [3] McAfee Antivirus - W32/MyDoom.ah@mm
 	    http://us.mcafee.com/virusInfo/default.asp?id=description&virus_k=129631




AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. 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.

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:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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 member emergencies only.
===========================================================================

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