[ISN] Microsoft Security Bulletin (MS98-012)

From: mea culpa (jerichoat_private)
Date: Tue Aug 18 1998 - 14:00:59 PDT

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    From: Microsoft Product Security Response Team <secureat_private>
    
    
    Microsoft Security Bulletin (MS98-012)
    ------------------------------------------------------------------------
    Updates available for Security Vulnerabilities in Microsoft PPTP
    
    
    Originally Posted: August 18, 1998
    Last Revised: August 18, 1998
    
    Summary
    =======
    Microsoft has released a set of patches that fix several security issues
    with implementations of the Point-to-Point Tunneling Protocol (PPTP) used in
    Microsoft Virtual Private Networking (VPN) products. Customers using
    affected software listed below to secure communcations over a public network
    (i.e. the Internet) should download and apply these patches as soon as
    possible.
    
    Customers who are not using PPTP for network security are not affected by
    this issue.
    
    Issue
    =====
    The Microsoft implementation of PPTP uses MS-CHAP for user authentication
    and Microsoft Point-to-Point Encryption (MPPE) to protect the
    confidentiality of user data. Potential vulnerabilities addressed by these
    updates include:
     - Dictionary attack against the LAN Manager authentication information
     - Password theft
     - PPTP server spoofing
     - Reuse of MPPE session keys
    
    While there have not been any reports of customers being adversely affected
    by these problems, Microsoft is releasing these patches to address the
    implied risks posed by these issues.
    
    Affected Software Versions
    ==========================
    The following software is affected by this vulnerability:
     - Microsoft Dialup Networking 1.2x and earlier on Windows 95
     - Microsoft Remote Access Services on Windows NT 4.0 (both client and
    server)
     - Microsoft Routing and Remote Access Services on Windows NT Server 4.0
     - Microsoft Windows 98 Dialup Networking
    
    What Microsoft is Doing
    =======================
    On August 18th Microsoft released a set of patches that fix the problems
    identified. These patches are available for download by Windows NT, Windows
    95 and Windows 98 customers from the Microsoft FTP site.
    
    Microsoft has sent this security bulletin to customers subscribing to the
    Microsoft Product Security Notification Service (see
    http://www.microsoft.com/security/bulletin.htm for more information about
    this free customer service).
    
    Microsoft has published the following Knowledge Base (KB) articles on this
    issue:
     - Microsoft Knowledge Base (KB) article Q154091, Windows 95
       Dial-Up Networking 1.3 Upgrade Release Notes,
       http://support.microsoft.com/support/kb/articles/q154/0/91.asp
     - Microsoft Knowledge Base (KB) article Q189594, RRAS Hotfix 3.0
       http://support.microsoft.com/support/kb/articles/q189/5/94.asp
     - Microsoft Knowledge Base (KB) article Q189595, Windows NT 4.0
       PPTP Security Update,
       http://support.microsoft.com/support/kb/articles/q189/5/95.asp
     - Microsoft Knowledge Base (KB) article Q189771, Windows 98 PPTP
       Security Update,
       http://support.microsoft.com/support/kb/articles/q189/7/71.asp
    
    What customers should do
    ========================
    Microsoft highly recommends that users of affected software versions, listed
    in the "Affected Software Versions" section above, should download the
    appropriate patch. Complete URLs for each affected software version is given
    below.
    
    Windows NT 4.0 RAS Users
    ------------------------
    Download the patch from:
     - ftp://ftp.microsoft.com/bussys/winnt/winnt-public/
             fixes/usa/NT40/hotfixes-postSP3/pptp3-fix/
    
    NOTE: The above link has been wrapped for readability.
    
    Windows NT 4.0 RRAS Users
    -------------------------
    Download the patch from:
     - ftp://ftp.microsoft.com/bussys/winnt/winnt-public/
            fixes/usa/NT40/hotfixes-postSP3/rras30-fix/
    
    NOTE: The above link has been wrapped for readability.
    
    Windows 95 Users
    ----------------
    Download the patch from:
     - ftp://ftp.microsoft.com/softlib/mslfiles/msdun13.exe
    
    Windows 98 Users
    ----------------
    Download the patch from:
     - ftp://ftp.microsoft.com/softlib/mslfiles/dun40.exe
    
    Strong Encryption Versions (128-bit)
    ------------------------------------
    Customers in the United States and Canada can download the strong encryption
    versions of these updates from:
     - http://mssecure.www.conxion.com/cgi-bin/ntitar.pl
    
    More Information
    ================
    Please see the following references for more information related to this
    issue.
    
     - Microsoft Security Bulletin MS98-012, Updates available for Security
       Vulnerabilities in Microsoft PPTP, (the Web posted version of this
    bulletin),
       http://www.microsoft.com/security/bulletins/ms98-012.htm
     - Microsoft Knowledge Base (KB) article Q154091, Windows 95
       Dial-Up Networking 1.3 Upgrade Release Notes,
       http://support.microsoft.com/support/kb/articles/q154/0/91.asp
     - Microsoft Knowledge Base (KB) article Q189594, RRAS Hotfix 3.0
       http://support.microsoft.com/support/kb/articles/q189/5/94.asp
     - Microsoft Knowledge Base (KB) article Q189595, Windows NT 4.0
       PPTP Security Update,
       http://support.microsoft.com/support/kb/articles/q189/5/95.asp
     - Microsoft Knowledge Base (KB) article Q189771, Windows 98 PPTP
       Security Update,
       http://support.microsoft.com/support/kb/articles/q189/7/71.asp
    
    Revisions
    =========
     - August 18, 1998: Bulletin Created
    
    For additional security-related information about Microsoft products, please
    visit http://www.microsoft.com/security
    
    ----------------------------------------------------------------------------
    ----
    
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