[SECURITY-L] [0_46533_AEE7C282-5BFD-4E84-98BC-79A14F27B03B_BR em Newsletters.Microsoft.com: Microsoft Security Bulletin MS03-011:Flaw in Microsoft VM Could Enable System Compromise (816093)]

Qui Abr 10 09:18:23 -03 2003

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From: "Microsoft" <0_46533_AEE7C282-5BFD-4E84-98BC-79A14F27B03B_BR em Newsletters.Microsoft.com>
Subject: Microsoft Security Bulletin MS03-011:Flaw in Microsoft VM Could Enable System Compromise (816093)
To: <mieko em ccuec.unicamp.br>
Date: Thu, 10 Apr 2003 05:00:12 -0700
X-Mailer: Microsoft CDO for Windows 2000

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Title:      Flaw in Microsoft VM Could Enable System Compromise 
	    (816093)
Date:       09 April 2003
Software:   Microsoft VM 
Impact:     Allow attacker to execute code of his or her choice
Max Risk:   Critical
Bulletin:   MS03-011

Microsoft encourages customers to review the Security Bulletins 
at: 

http://www.microsoft.com/technet/security/bulletin/MS03-011.asp
http://www.microsoft.com/security/security_bulletins/ms03-011.asp
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Issue:
======
The Microsoft VM is a virtual machine for the Win32(r) operating 
environment. The Microsoft VM is shipped in most versions of 
Windows, as well as in most versions of Internet Explorer. 

The present Microsoft VM, which includes all previously released 
fixes to the VM, has been updated to include a fix for the newly 
reported security vulnerability. This new security vulnerability 
affects the ByteCode Verifier component of the Microsoft VM, and 
results because the ByteCode verifier does not correctly check for 
the presence of certain malicious code when a Java applet is being 
loaded. The attack vector for this new security issue would likely 
involve an attacker creating a malicious Java applet and inserting 
it into a web page that when opened, would exploit the 
vulnerability. An attacker could then host this malicious web page 
on a web site, or could send it to a user in e-mail. 

Mitigating Factors:
====================

- - In order to exploit this vulnerability via the web-based attack 
vector, the attacker would need to entice a user into visiting a 
web site that the attacker controlled. The vulnerability themselves 
provide no way to force a user to a web site. 

- - Java applets are disabled within the Restricted Sites Zone. As a 
result, any mail client that opened HTML mail within the Restricted 
Sites Zone, such as Outlook 2002, Outlook Express 6, or Outlook 98 
or 2000 when used in conjunction with the Outlook Email Security 
Update, would not be at risk from the mail-based attack vector. 

- - The vulnerability would gain only the privileges of the user, so 
customers who operate with less than administrative privileges 
would be at less risk from the vulnerability. 

- - Corporate IT administrators could limit the risk posed to their 
users by using application filters at the firewall to inspect and 
block mobile code. 

Risk Rating:
============
Critical

Patch Availability:
===================
A patch is available to fix this vulnerability. Please read the 
Security Bulletins at

http://www.microsoft.com/technet/security/bulletin/ms03-011.asp
http://www.microsoft.com/security/security_bulletins/ms03-11.asp

for information on obtaining this patch.

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