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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2007.0044 -- AUSCERT ALERT
                                   [Win]
   MS07-021 - Vulnerabilities in CSRSS Could Allow Remote Code Execution
                               11 April 2007

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        AusCERT Alert Summary
        ---------------------

Product:              Windows Vista
                      Microsoft Windows XP SP2 and prior
                      Microsoft Windows Server 2003 SP2 and prior
                      Microsoft Windows 2000 SP4 and prior
Publisher:            Microsoft
Operating System:     Windows
Impact:               Administrator Compromise
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-1209 CVE-2006-6797 CVE-2006-6696

Ref:                  AL-2006.0128

Original Bulletin:    
  http://www.microsoft.com/technet/security/bulletin/ms07-021.mspx

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MS07-021 - Vulnerabilities in CSRSS Could Allow Remote Code Execution (930178)

Affected Software:
   -Microsoft Windows 2000 Service Pack 4
   -Microsoft Windows XP Service Pack 2
   -Microsoft Windows XP Professional x64 Edition and 
    Microsoft Windows XP Professional x64 Edition Service Pack 2
   -Microsoft Windows Server 2003,
    Microsoft Windows Server 2003 Service Pack 1 and 
    Microsoft Server 2003 Service Pack 2
   -Microsoft Windows Server 2003 for Itanium-based Systems, 
    Microsoft Windows Server 2003 with SP1 for Itanium-based Systems, and 
    Microsoft Windows Server 2003 with SP2 for Itanium-based Systems
   -Microsoft Windows Server 2003 x64 Edition and 
    Microsoft Windows Server 2003 x64 Edition with Service Pack 2
   -Windows Vista
   -Windows Vista x64 Edition

Full MS07-021 advisory:
   http://www.microsoft.com/technet/security/bulletin/ms07-021.mspx


Vulnerability Details

MsgBox (CSRSS) Remote Code Execution Vulnerability - CVE-2006-6696

    A remote code execution vulnerability exists in the Windows
    Client/Server Run-time Subsystem (CSRSS) process because of the way
    that it handles error messages. An attacker could exploit the
    vulnerability by constructing a specially crafted application that
    could potentially allow remote code execution.

    Additionally, if a user viewed a specially crafted Web site, an
    attacker who successfully exploited this vulnerability could take
    complete control of an affected system.

CSRSS Local Elevation of Privilege Vulnerability - CVE-2007-1209

    A privilege elevation vulnerability exists in the way that the Windows
    32 Client/Server Run-time Subsystem (CSRSS) handles its connections
    during the startup and stopping of processes.

    An attacker who successfully exploited this vulnerability could take
    complete control of an affected system.

CSRSS DoS Vulnerability - CVE-2006-6797

    A denial of service vulnerability exists in the Client/Server Run-time
    Subsystem (CSRSS) service because of the way it handles error messages.
    An attacker could exploit the vulnerability by running a specially
    crafted application causing the system to restart.

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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