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I - TITLE Security advisory: Arbitrary file disclosure vulnerability in rrdbrowse II - SUMMARY Description: Arbitrary file disclosure vulnerability in rrdbrowse <= 1.6 Author: Sebastian Wolfgarten (sebastian at wolfgarten dot com), http://www.devtarget.org Date: March 4th, 2007 Severity: Medium References: http://www.devtarget.org/rrdbrowse-advisory-03-2007.txt III - OVERVIEW Quote from rrdbrowse.org: "RRDBrowse is a poller daemon, templater and webinterface for RRDTool. It has a threaded daemon which periodically runs from cron. It works with small .nfo files which hold router information and optionally connection details, colors, min max, bandwidth settings, etc, etc. RRDBrowse uses a small caching mechanism to store interface names. It's much MRTG like in it's current state". More information about the product can be found online at http://www.rrdbrowse.org. IV - DETAILS Due to inproper input validation, the CGI application "rrdbrowse" (versions <=1.6) is vulnerable to an arbitrary file disclosure vulnerability. It allows an unauthenticated remote attacker to read any file on the remote system if the user the webserver is running as has permissions to do so. Thus an attacker is able to gain access potentially sensitive information. V - EXPLOIT CODE The vulnerability is trivial to exploit and only requires specifying an URL with a relative file path on the remote system such as http://$target/cgi-bin/rb.cgi?mode=page&file=../../../../../../../../etc/passwd As the input to the "file" parameter is not validated in any way accessing this URL will expose the contents of /etc/passwd to a remote attacker (interestingly except the first line). VI - WORKAROUND/FIX To address this problem, the author of rrdbrowse (Tommy van Leeuwen) has released an updated CVS version (1.7) of the software which is available at http://www.rrdbrowse.org. Hence all users of rrdbrowse are asked to test and install this version as soon as possible. VII - DISCLOSURE TIMELINE 06. February 2007 - Notified vendor 14. Feburary 2007 - Patch/new version released 04. March 2007 - Public disclosure # milw0rm.com [2007-03-04]