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HOWTOCRA.ZIP
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HOWTOCRA.TXT
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1991-10-01
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6KB
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162 lines
%%%%%%%%%% HOW TO DESTROY AN RBBS-PC SYSTEM %%%%%%%%%%
BY: MAD HACKER
IN THE COURSE OF YOUR HACKING AND PHREAKING ACTIVITIES,
YOU WILL RUN ACROSS A GEEK SYSOP OR TWO. IN THIS SERIES OF
ARTICLES, I AM GOING TO DESCRIBE WAYS TO DESTROY THESE GEEK
BOARDS. I WILL COVER MOST OF THE MAJOR BBS PROGRAMS IN THE
COURSE OF THIS TUTORIAL SET. THIS ISSUE WILL DEAL WITH THE
RBBS SYSTEM.
BASIC SYSTEM FACTS :
--------------------
HARDWARE : IBM-PC (OR XT)
2 DRIVES
128K OR MORE
HAYES SMARTMODEM
FILES : COMMENTS TO SYSOP STORED IN "COMMENTS"
MESSAGES STORED IN "MESSAGES"
HELP FILES : "HELP01" - "HELP07"
DOWNLOAD DIRCTORIES : "DIR" - "DIR 99"
(DIR CONTIANS LIST OF DIRECTORIES ON CPC 12.1C AND OVER.
IN EARLIER VERSIONS, ALL FILES ARE CONTAINED HERE.)
USER FILES (PASSWORDS, ETC) : "USERS"
SYSTEM CONFIG FILE (SYSOP'S PASSWORD, ETC) : "RBBS-PC.DEF"
BUG #1 : DOWNLOADING THE USER FILE
----------------------------------
VERSIONS THAT MAY BE ATTACKED THIS WAY : CPC 12.1C AND BEFORE.
PROCEDURE : DOWNLOAD "USERS."
READ PASSWORDS.
HAVE PHUN.
NOTE : LOOK FOR PASSWORDS MARKED "SYSOP". THESE PASSWORDS ON CPC 12.1F HAVE
THE ABILITY TO DROP TO DOS.
EXPLAINATION :
--------------
IBM'S BASIC (BY MICROSOFT) IS A RATHER HIGH LEVEL BASIC, WITH MANY
POWERFUL COMMANDS. PC DOS, HOWEVER, IS A RATHER IDIOT-PROOF DISK SYSTEM.
THE PROBLEM LIES IN THE DIFFERENT WAYS DOS AND BASIC INTERPRET A STRING
OF CHARACTERS. IN THE RBBS PROGRAM IS A LINE THAT SAYS :
IF FN$ = USERS$ THEN 13520
FN$ IS THE NAME OF THE FILE YOU REQUESTED FOR DOWNLOAD.
USER$ IS THE NAME OF THE USER FILE (USERS).
13520 IS THE LINE THAT PRINTS "FILE XXXX NOT FOUND. TYPE L FOR DIR"
NOW THAT YOU KNOW HOW RBBS WAS MEANT TO TRAP HACKERS, IT IS EASY TO
EXPLAIN THE FALACY OF IT'S WAYS. BASIC SAYS THAT "USERS" IS NOT EQUAL
TO "USERS." (AND FOR GOOD REASON!!!). BUT PC DOS SAYS THAT "USERS" IS
EQUAL TO "USERS.". SO YOU ARE ACCESSING THE SAME FILE, BUT UNDER 2
DIFFERENT NAMES. SINCE THE SYSTEM ONLY TRAPS ONE OF THEM, YOU CAN USE THE
OTHER ONE AND GET THE SAME DATA. THIS PROBLEM IS WELL KNOWN AND MOST
RBBS SYSTEMS HAVE BEEN FIXED TO AVOID THIS BUG.
BUG #2 : DOWNLOADING THE SYSOP'S PASSWORD
-----------------------------------------
VERSIONS ATTACKABLE : ANY RBBS UP TO VERSION 12.2, WHICH IS STILL
IN TESTING BY TOM MACK.
PROCEDURE : DOWNLOAD "RBBS-PC.DEFF"
READ PASSWORD
HAVE PHUN
THE SYSOP'S PASSWORD IS CONTAINED IN A FILE CALLED "RBBS-PC.DEF".
THERE IS A TRAP IN THE RBBS CODE TO PREVENT YOU FROM DOWNLOADING IT.
BUT, HERE AGAIN, BASIC AND DOS ARE NOT IN AGREEMENT ABOUT THE
EQUIVILANCE OF STRINGS. BASIC SAYS THAT "RBBS-PC.DEFF" <> "RBBS-PC.
DEF" (AGAIN, RIGHTFULLY SO!!). BUT DOS TRUNCATES THE EXTRA CHARACTER,
AND ALLOWS YOU TO GET THE SAME FILE UNDER THIS NAME. (NOTE THAT ANY
CHARACTER WILL WORK AFTER THE "F" IN .DEF. SO IF THE SYSOP HAS FIXED
THIS BUG, TRY ANOTHER CHARACTER. HE MIGHT HAVE BEEN TOO DUMB TO SET
UP A LENGTH TEST AND JUST TRAPPED "RBBS-PC.DEFF"). THIS BUG, TOO, IS
WELL KNOWN, AND MAY BE FIXED ON SOME BOARDS.
BUG #3 : OVERLOADING THE USER FILE
----------------------------------
VERSIONS ATTACKABLE : ALL
PROCEDURE : WRITE A PROGRAM THAT CALLS THE BOARD HPEATEDLY UNDER
NEW NAMES EACH TIME.
EXPLAINATION :
--------------
THIS IS RATHER OBVIOUS. IF YOU KEEP FILLING UP THE USERLOG
WITH BULLSHIT I.D.'S, YOU WILL CAUSE IT TO BECOME TOO LARGE, AND
DOS WILL NOT ALLOW IT TO BE WRITTEN TO. THIS WILL CAUSE IT TO
"FATAL ERROR" WHENEVER A CALLER LOGS ON.
WELL, THAT ABOUT WRAPS IT UP FOR THIS TIME. NEXT TIME : HOW
TO KILL A NET-WORKS SYSTEM.
/\ /\
/ \ / \
/ \/ \ ------
/ \
/ \AD ACKER
++++++++++++++++++++++++++++++++++++++++++
++ How to crash Fido BBS's. ++
+ +
+ By: Bishop +
++ ++
++++++++++++++++++++++++++++++++++++++++++
How to crash Fido bbs's.. hmm this is a very easy thing to do..
so this file will be very short.. ok.. try this..
When you get to a message area do an area command and it will list
all of the message areas..
---- Fido ----
1... General
2... Tech
3..* Fido Mail
Message? <-- when you get a promt here type.. 3333333, 6 to 7 threes
and this will lock the system up.. as of Fido 11w I'm not
sure if this still works..
But remember that the sysop has his logs and such so he can see who
called and such.. he will also know how you did it.. it will stay on his
screen.
well.. thats one way.. the next way is to goto a message area and use the
Edit command on a message.. <Fido has major bugs in Message areas> Well,
this is what you do from there..
goto the message area and enter a message, then edit something in the
message. When it gives you the promt "New String:" enter like over 80+
characters. And it will give you a bunch of forward slashs, then hit
return. ok.. thats half of the bitch! Now! Go over there and type 'I'
to use the Insert command and then the line number that you just edited
it will them fuck up big time!!! Yes thats it you have now locked up
one of the worlds most popular systems! well done dude!
L A T O R !
FROM THE DOCTOR'S OFFICE (301)-926-3470
Downloaded from the Matrix 415-922-1370
Downloaded from Just Say Yes 415-922-2008 CASFA
Downloaded from The Screaming Electron (415)-935-5845