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Message-ID: <BAY1-F48yZR4XAQU7mA00006eeb@hotmail.com>
From: hughmann at hotmail.com (Hugh Mann)
Subject: ALLO ALLO WS_FTP Server
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Advisory Name: ALLO ALLO WS_FTP Server
Impact : Arbitrary code execution as SYSTEM
Discovered by: Hugh Mann hughmann@...mail.com
Tested progs : Ipswitch WS_FTP Server 4.0.2.EVAL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Description
~~~~~~~~~~~
A user who can upload files, and also has a max number of files limit or max
total file size limit, can read any memory address the WS_FTP Server can
read. With the right address, the user can cause a buffer overflow and
execute arbitrary code as SYSTEM.
Details
~~~~~~~
There's a vulnerability in the ALLO handler when it sends an error string to
the client. Instead of pushing an ASCIIZ string, it pushes a 64-bit value
equal to total size of all files in user's dir and any sub-dirs. This is a
value we can easily control if we exploit the WS_FTP Server REST
vulnerability. If we change this value to a string of size equal to ~256
bytes, we can overwrite the return address and execute arbitrary code as
SYSTEM.
Exploit
~~~~~~~
See the attached source code.
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