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3. How to make a bad file and other goodies:
The most deadly hole in security in the HP2000 is the "two terminal" method.
You've got to understand buffers to see how it works. When you OPEN a file,
or ASSIGN it (same thing), you get 256 bytes of the file -- the first 256.
When you need anymore, you get 256 more. They are brought in off the disk in
discrete chunks. They are stored in "buffers."
So. Save a bunch of junk to disk -- programs, data, whatever. Then once your
user number is full, delete all of it. The effect is to leave the raw jumbled
data on disk.
Pick a time when the system is REAL busy, then:
1. Have terminal #1 running a program that looks for a file to exist (with the
ASSIGN) statement as quickly as it can loop. If it finds the file there, it
goes to the very end of the file, and starts reading backwards, record by
record, looking for data. If it finds data, it lets you know, and stops at an
input prompt. It is now running.
2. Have terminal #2 create a really huge data file (OPEN-FILE, 3000) or
however it goes.
What happens is terminal #2's command starts zeroing all the sectors of the
file, starting at file start. But it only gets so far before someone else
needs the processor, and kicks #2 out. The zeroing stops for a sec. Terminal
#1 gets in, finds the file there, and reads to the end. What's there? Old
trash on disk. (Which can be mighty damned interesting by the way -- did you
know HP uses a discrete mark to indicate end-of-buffer? You've just maybe got
yourself a buffer that is as deep as system memory, and if you're clever, you
can peek or poke anywhere in memory. If so, keep it, it is pure gold).
But. Back to the action.
3. Terminal #2 completes the OPEN. He now deletes the file. This leaves
Terminal #1 with a buffer full of data waiting to be dumped back to disk at
that file's old disk location.
4. Terminal #2 now saves a load of program files, as many as are required to
fill up the area that was taken up by the deleted big file.
5. You let Terminal #1 past the input prompt, and it writes its buffer to
disk. This promptly overlays some program just stored there. Result: "bad
program." HPs are designed with a syntax checker and store programs in token;
a "bad program" is one that the tokens are screwed up in. Since HP assumes
that if a program is THERE, it passed the syntax check, it must be okay...
it's in for big problems. For a quick thrill, just CSAVE it.. system tries
to semi-compile bad code, and drops.
Really, the classier thing to do with this is to use the "bottomless buffer"
to look through your system and change what you don't like.. maybe the
password to A000? Write some HP code, look around memory, have a good time.
It can be done.
** Grey Sorcerer
% = % = % = % = % = % = % = %
= =
% P h r a c k X V I I %
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Phrack Seventeen
07 April 1988
File 7 of 12 : Accessing Government Computers
+++++++++++++++++++++++++++++++++++++++
+ ACCESSING GOVERNMENT COMPUTERS +
+ (LEGALLY!) +
+-------------------------------------+
+ Written by The Sorceress +
+ (The Far Side 415/471-1138) +
+++++++++++++++++++++++++++++++++++++++
Comment: I came across this article in Computer Shopper (Sept. 1987) and it
talked about citizens access government computers since we do pay for them
with our taxpayers monies. Since then, I have had friends and gone on a
few myself and the databases are full of information for accessing. One
thing, you usually have to call the sysop for access and give him your real
name, address and the like. They call you back and verify your existence.
Just a word of warning; crashing a BBS is a crime, so I wouldn't fool with
these since they are government based.
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