Operating System:

Published:

11 July 2003

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                ESB-2003.0483 -- CIAC Bulletin Number N-115
     Buffer Overrun in Microsoft Windows Could Lead to Data Corruption
                               11 July 2003

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                Microsoft Windows NT Server 4.0
                        Microsoft Windows NT Server 4.0, Terminal Server
                        Edition
                        Microsoft Windows 2000
                        Windows XP Professional
Publisher:              CIAC
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Existing Account

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             __________________________________________________________

                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

       Buffer Overrun in Microsoft Windows Could Lead to Data Corruption
                     [Microsoft Security Bulletin MS03-024]

July 10, 2003 17:00 GMT                                           Number N-115
______________________________________________________________________________
PROBLEM:       A flaw exists in the way that the server validates the 
               parameters of an SMB (Server Message Block) packet. The server 
               is not properly validating the buffer length established by the 
               packet. If the client specifies a buffer length that is less 
               than what is needed, it can cause the buffer to overrun. 
SOFTWARE:      * Microsoft Windows NT Server 4.0 
               * Microsoft Windows NT Server 4.0, Terminal Server Edition 
               * Microsoft Windows 2000 
               * Windows XP Professional 
DAMAGE:        By sending a specially crafted SMB packet request, an attacker 
               could cause a buffer overrun to occur. If exploited, this could 
               lead to data corruption, system failure, or in the worst case, 
               allow an attacker to run code of their choice. 
SOLUTION:      Apply patches as stated in Microsoft's security bulletin. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. In order to exploit this vulnerability, an 
ASSESSMENT:    attacker would need a valid user account, and be authenticated 
               by the server prior to sending an SMB packet to it. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-115.shtml 
 ORIGINAL BULLETIN:                                                           
                     http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS03-024.asp 
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