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             AUSCERT External Security Bulletin Redistribution

         Vulnerability in JScript and VBScript Engines Could Allow
                      Remote Code Execution (2706045)
                              15 August 2012


        AusCERT Security Bulletin Summary

Product:           JScript 5.8 and VBScript 5.8
Publisher:         Microsoft
Operating System:  Windows XP
                   Windows Server 2003
                   Windows Vista
                   Windows Server 2008
                   Windows 7
                   Windows Server 2008 R2
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-2523  

Original Bulletin: 

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Microsoft Security Bulletin MS12-056 - Important
Vulnerability in JScript and VBScript Engines Could Allow Remote Code 
Execution (2706045)

Published Date: August 14, 2012

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in the JScript 
and VBScript scripting engines on 64-bit versions of Microsoft Windows. The 
vulnerability could allow remote code execution if a user visited a specially 
crafted website. An attacker would have no way to force users to visit the 
website. Instead, an attacker would have to convince users to visit the website, 
typically by getting them to click a link in an e-mail message or Instant 
Messenger message that takes users to the attacker's website.

This security update is rated Important for JScript 5.8 and VBScript 5.8 on 
64-bit Windows clients. This security update is also rated Low for JScript 5.8 
on 64-bit Windows servers. For more information, see the subsection, Affected 
and Non-Affected Software, in this section.

Affected Software

Windows XP Professional x64 Edition Service Pack 2 
Windows Server 2003 x64 Edition Service Pack 2
Windows Vista x64 Edition Service Pack 2 
Windows Server 2008 for x64-based Systems Service Pack 2 
Windows 7 for x64-based Systems 
Windows 7 for x64-based Systems Service Pack 1 
Windows Server 2008 R2 for x64-based Systems 
Windows Server 2008 R2 for x64-based Systems Service Pack 1 
Windows Server 2008 R2 for Itanium-based Systems 
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 

Vulnerability Information

JavaScript Integer Overflow Remote Code Execution Vulnerability -

A remote code execution vulnerability exists in the way that the JScript and 
VBScript engines calculate the size of an object in memory during a copy 
operation. The vulnerability may corrupt memory in such a way that an attacker 
could execute arbitrary code in the context of the current user. If the
current user is logged on with administrative user rights, an attacker who 
successfully exploited this vulnerability could take complete control of an 
affected system. An attacker could then install programs; view, change, or 
delete data; or create new accounts with full user rights.

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