Joomla! Component mod_VisitorData 1.1 – Remote code Execution
Joomla Module Camp26 Visitor Data 1.1 Remote code Execution ============================================================ - Discovered by : Chip D3 Bi0s - Email : chipdebios@gmail.com - Date : 2010-04-28 - Severity : 9/10 (CVSS scored) ------------------------------- Module Camp26 Visitor Data For Joomla 1.5.x Version : 1.1 Type : Non-Commercial Created by : Denny Setiarika Pirhadi - camp26.biz Team License : GPLv2.0 - http://www.gnu.org/licenses/gpl-2.0.html Created on : 02 May 2008 Latest Update : 26 December 2008 URL : www.camp26.biz I. BACKGROUND Visitor Data Module shows the visitor's data on your live site (Their IP, Proxy(if used), Country, ISP, Browser, Operating System). Based on GeoIP (www.maxmind.com). II. DESCRIPTION Some technical issues were originally published in the following post: http://elotrolad0.blogspot.com/2010/05/modvisitordata-joomla-remoce-code.html with whom originally exploit the error, as r0i like to thank, who Realizing the proof of concept. III. ANALYSIS The bug is in the following files, specifying the lines file: /modules/mod_VisitorData/tmpl/default.php line: [47] if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) { [48] $whois ="whois " . $_SERVER['HTTP_X_FORWARDED_FOR'] ." | grep netname"; [49] } [50] else{ [51] $whois ="whois " . $_SERVER['REMOTE_ADDR'] ." | grep netname"; [52] } [53] [54] $isp_user = exec($whois); explaining the code: what to do is get our ip, and if it passes through any proxy other than q are also other issues in the code as the country of connection, image, browser, operating system. As can be seen to see if it goes through a proxy using the exec (), line 54, reason that allows you to run remote commands. If the conditional check whether to park in the header HTTP_X_FORWARDED_FOR,if this happens take this value otherwise take REMOTE_ADDR, 2 may be present at one time. command to run only can we add X-Forwarded-For in the header to take this value and run exec () which is what we are interested. IV. EXPLOITATION You have to add X-Forwarded-For:;[command-here];1 +++++++++++++++++++++++++++++++++++++++ [!] Produced in South America +++++++++++++++++++++++++++++++++++++++ |