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             AUSCERT External Security Bulletin Redistribution

    Vulnerability in LRPC Could Allow Security Feature Bypass (2978668)
                              13 August 2014


        AusCERT Security Bulletin Summary

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Reduced Security -- Unknown/Unspecified
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-0316  

Original Bulletin: 

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Microsoft Security Bulletin MS14-047 - Important
Vulnerability in LRPC Could Allow Security Feature Bypass (2978668)

Published: August 12, 2014

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft
Windows. The vulnerability could allow security feature bypass if an attacker
uses the vulnerability in conjunction with another vulnerability, such as a 
remote code execution vulnerability, that takes advantage of the ASLR bypass 
to run arbitrary code.

This security update is rated Important for all supported editions of Windows
7, Windows Server 2008 R2, Windows 8, Windows 8.1, Windows Server 2012, 
Windows Server 2012 R2, Windows RT, and Windows RT 8.1.

Affected Software

Windows 7 
Windows Server 2008 R2 
Windows 8
Windows 8.1 
Windows Server 2012 
Windows Server 2012 R2 
Windows RT and Windows RT 8.1.

Vulnerability Information

A security feature bypass vulnerability exists in Microsoft Remote Procedure 
Call (LRPC). The problem is that an LRPC server may leak the message it 
receives from the client if the message is of a specific type and has a data 
view attached (which is not expected for messages of the type). RPC considers
this an error and returns, but does not free the message. This allows the 
client to fill up the address space of the server with such messages.

To view this vulnerability as a standard entry in the Common Vulnerabilities 
and Exposures list, see CVE-2014-0316.

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