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                             Luigi Auriemma

Application:  Perforce Server
              http://www.perforce.com
Versions:     <= 2007.3/143793
Platforms:    Windows, Unix, Linux and Mac
Bugs:         NULL pointers, invalid memory access and endless loop
Exploitation: remote
Date:         05 Mar 2008
Author:       Luigi Auriemma
              e-mail: aluigi@autistici.org
              web:    aluigi.org


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1) Introduction
2) Bugs
3) The Code
4) Fix


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===============
1) Introduction
===============


From vendor's website:
"Perforce SCM (Software Configuration Management) versions and manages
source code and digital assets for enterprises large and small."


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=======
2) Bugs
=======


The Perforce server is affected by multiple vulnerabilities which
allow any unauthenticated attacker to crash the server or consuming all
its resources.

The first type of vulnerabilities includes the NULL pointers generated
by the absence of some parameters in the client's request and the lack
of checks on the pointers returned by the functions which get these
values from the packets.

The commands affected by these NULL pointer vulnerabilities are the
following: dm-FaultFile, dm-LazyCheck, dm-ResolvedFile, dm-OpenFile,
crypto and possibly others.

A secondary type of vulnerabilities is exploitable through the
server-DiffFile and server-ReleaseFile commands, in this case the
problem is caused by the 32 bit number provided by the client which is
used as amount of elements in the initialization of an array.

Another problem is then exploitable again with a malformed
server-DiffFile command and allows to force the server in an endless
loop which will cause its termination after having consumed all the
memory and the resources of the system.


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===========
3) The Code
===========


http://aluigi.org/poc/perforces.zip


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======
4) Fix
======


No fix


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