Re: Windows 95 Serv-U FTP bug

From: tl (tlat_private)
Date: Thu Feb 05 1998 - 09:31:10 PST

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    This program doesn't do anything to my Serv-U program.  I can see the
    garbage flooding, however when I break out of serv-who.c, serv-u continues
    to run normally without any crash or system slowdown.  I'm running win95
    osr2 on a PPro 150, and ServU version 2.0c 32bit.  This is an older version
    so perhaps that's the reason ..
    
    -----Original Message-----
    
    
    >Hello,
    >After reading an earlier message, Windows 95/NT War FTPD 1.65 Buffer
    >Overflow, I thought I might play around with some other Windows ftp
    >servers.  One problem I found was in Serv-U FTP by Cat-Soft
    ><http://www.cat-soft.com>.  After you connect instead of sending the normal
    >USER then PASS, you can send garbage.  And if you send alot of garbage at a
    >high speed Serv-U will stop responding to mouse clicks and after a short
    >amount of time will crash and give you this:
    >
    >SERV-U32 caused a stack fault in module KERNEL32.DLL at 014f:bff9a08c.
    >Registers:
    >EAX=005e2084 CS=014f EIP=bff9a08c EFLGS=00000246
    >EBX=17bf0514 SS=0157 ESP=005e2080 EBP=005e20d4
    >ECX=005e2098 DS=0157 ESI=81628c70 FS=2347
    >EDX=ffffffff ES=0157 EDI=0000ffff GS=0000
    >Bytes at CS:EIP:
    >5e 8b e5 5d c2 10 00 64 a1 00 00 00 00 55 8b ec
    >Stack dump:
    >00000001 c00000fd 00000000 00000000 bff9a08c 00000000 01570157 01870028
    >17bf0b6a c10fabe8 16c70001 80dc0014 16e73a45 00040000 02000000 bff97fdc
    >
    >Why it does this I have no idea.  It only acts this way in the windows 95
    >version.  Under NT the cpu usage goes up to 100%, but no crash.  Alot of
    >times even after the crashed Serv-U has closed, Windows is still slow to
    >non responsive.
    >
    >And here is the program I used, not pretty but it works:
    >
    



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