Re: (pointless?) overflow in tftp.exe (Was: Re: twlc advisory: possible overflow in ms ftp client)

From: Lincoln Yeoh (lyeohat_private)
Date: Fri Nov 02 2001 - 18:35:36 PST

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    At 10:36 AM 11/2/01 +0000, foobat_private wrote:
    >
    >On the topic of rather pointless, yet interesting, exploits,
    >the microsoft tftp client has a buffer overflow:
    
    >Maybe a heap overflow.  Probably usable to run code.  Pointless-factor-10.
    >As far as i can tell, the remote server doesnt need to exist - it crashes
    >before the network is used.
    >
    >One possible non-pointless use of such client overflows could be if you
    >can remotely run commands on a machine, say through IIS, but not
    >upload code.  You could use this with some payload to execute
    >arbitrary code.  Probably.
    
    Is it possible to use it shutdown those Code Red/Nimda NT servers remotely?
    Does IIS by default have enough permissions to shutdown the whole computer
    or must it do some set privilege thing?
    
    Cheerio,
    Link.
    



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