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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                    ESB-2001.515 -- CIAC Bulletin M-024
          Microsoft Internet Explorer calls telnet.exe with unsafe
                          command-line arguments
                              3 December 2001

===========================================================================

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

Product:                Internet Explorer 6.0 and earlier
Vendor:                 Microsoft
Operating System:       Windows
Impact:                 Execute Arbitrary Code/Commands
Access Required:        Remote

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             __________________________________________________________

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

                             INFORMATION BULLETIN

Microsoft Internet Explorer calls telnet.exe with unsafe command-line arguments
                      [CERT Vulnerability Note VU#952611]

November 30, 2001 01:00 GMT                                       Number M-024
______________________________________________________________________________
PROBLEM:       The telnet client can be invoked with unsafe options by 
               arbitrary HTML pages. 
PLATFORM:      IE 6.0 and earlier, when used with the telnet client in 
               services for Unix 2.0. 
DAMAGE:        Remote attackers can execute commands by spawning telnet with a 
               log file option on the command line and writing arbitrary code 
               into an executable file. 
SOLUTION:      Apply patch as described below. 
______________________________________________________________________________
VULNERABILITY  The risk is HIGH. A remote attacker could write files to the 
ASSESSMENT:    system of an unsuspecting user; including an executable file 
               with malicious intent. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/m-024.shtml 
 ORIGINAL BULLETIN:  http://www.kb.cert.org/vuls/id/952611 
______________________________________________________________________________


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