prb-advisory-02-2007.txt
Posted on 13 February 2007
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I - TITLE Security advisory: Arbitrary file disclosure vulnerability in php rrd browser (prb) II - SUMMARY Description: Arbitrary file disclosure vulnerability in php rrd browser < 0.2.1 Author: Sebastian Wolfgarten (sebastian at wolfgarten dot com), http://www.devtarget.org Date: February 11th, 2007 Severity: Medium References: http://www.devtarget.org/prb-advisory-02-2007.txt III - OVERVIEW Quote from sourceforge.net: "Prb stands for php rrd browser, inspired by rrdbrowse and cacti. A modular framework for creating rrd databases, updating and graphing data, based on apache, php, mysql and rrdtool. It will allow you to graph just about anything you like". More information about the product can be found online at http://prb.sourceforge.net. IV - DETAILS Due to inproper input validation, the web application "php rrd browser" (versions <0.2.1) 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/prb/www/?p=../../../../../../../etc/passwd As the input to the "p" parameter is not validated in any way accessing this URL will expose the contents of /etc/passwd to a remote attacker. VI - WORKAROUND/FIX To address this problem, the author of prb (Guillaume Fontaine) has released an updated version (0.2.1) of the software which is available at http://prb.sourceforge.net. Hence all users of prb are asked to test and install this version as soon as possible. VII - DISCLOSURE TIMELINE 07. February 2007 - Notified vendor 10. Feburary 2007 - Patch released 11. February 2007 - Public disclosure -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFFz0H9d8QFWG1Rza8RAncSAJwMe7l768sWSruW8xsHHexUD1vTYwCgoSnA xP1J4Bg/qIlNr//YkVbPMhY= =i7Q0 -----END PGP SIGNATURE-----
