Microsoft Security Bulletin MS03-011:Flaw in Microsoft VM Could Enable System Compromise (816093)

2003-04-10T00:00:00
ID SECURITYVULNS:DOC:4372
Type securityvulns
Reporter Securityvulns
Modified 2003-04-10T00:00:00

Description

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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


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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