caldouche what does your company think about you copy pasting production code on fd?
2011/4/13 Cal Leeming <[email protected]> > Absolutely nothing. It really is only meant to stop "stupid bots", which > for us, was good enough at the time ;p > > > On Wed, Apr 13, 2011 at 7:07 PM, Chris M <[email protected]> wrote: > >> How does all of this stop someone feeding the obfuscated code into >> jsunpack and reloading it into a bot application with an inbuilt browser >> object and just following links etc? >> >> >> On Wed, Apr 13, 2011 at 3:50 PM, Christian Sciberras >> <[email protected]>wrote: >> >>> Is it me or are spammers recruiting more script kiddies as of late? >>> Not much of a big deal considering their numbers are on the rise...*ahem* >>> anonymous *ahem*. >>> >>> Chris. >>> >>> >>> >>> >>> On Wed, Apr 13, 2011 at 4:47 PM, Cal Leeming <[email protected]>wrote: >>> >>>> Well, the problem was the person(s) running the bots kept bypassing the >>>> simple protections such as these. Although it isn't 100% fool proof, it >>>> does >>>> make things *extremely* difficult for the person(s) with the bots, so much >>>> so, that they usually give up, unless they have specifically targeted you >>>> for some reason. >>>> >>>> So, instead we created hundreds of these little JS chunks, all with >>>> different lookup tables applied, and cycled them on an hourly basis. It >>>> meant if they wanted to continuously bot the service, they would have to de >>>> obfuscate the protection code, or find a mathmatical/bruteforce attack that >>>> would generate the seedkey for them. It would either involve manual >>>> intervention or code modification on the bot to make it work.. I'd >>>> have preferred to have added captcha, but there was a reasonable >>>> explanation >>>> as to why the client didn't want it. >>>> >>>> Either way, once we put this in, they gave up pretty quickly lol. >>>> >>>> >>>> On Wed, Apr 13, 2011 at 3:29 PM, Christian Sciberras <[email protected] >>>> > wrote: >>>> >>>>> Cal /Ryan, >>>>> >>>>> I'm not sure what you're trying to achieve. >>>>> If we're talking about absolutely stupid bots, the following easily >>>>> defeats them: >>>>> <form> >>>>> <stuff/> >>>>> <script type=text/javascript>document.write('<input >>>>> type="hidden" name="access" value="code"/>');</script> >>>>> <form> >>>>> >>>>> I suppose you could obfuscate it all if you wanted to cater for script >>>>> kiddies. >>>>> But considering this is very weak protection (as opposed to proper >>>>> captcha), I'm not sure if it's even worthwhile. >>>>> One of the ways I can see this work is against automated, >>>>> "JS-ignorant", MITM systems. >>>>> >>>>> As indeed is true, you should never trust the end user. >>>>> But in a MITM scenario, the user we're not trusting is the one >>>>> conducting the attack, not the other. >>>>> >>>>> Chris. >>>>> >>>>> >>>>> >>>>> On Wed, Apr 13, 2011 at 1:07 PM, Cal Leeming <[email protected]>wrote: >>>>> >>>>>> Lol, I've just realised something.. I didn't include the seed key >>>>>> variable itself, so this code would have been pretty much useless on it >>>>>> own >>>>>> *DOH*. >>>>>> >>>>>> So, here's something else a bit tasty.. this is the server side code >>>>>> used to check and create the seedkey itself (secret lookup table has been >>>>>> changed obv.). >>>>>> >>>>>> This code allows seedkeys to be generated from epoch time. Now, >>>>>> cryptographically I don't know how "sane" this is, but I'm fairly sure >>>>>> that >>>>>> if the lookup table contained large integers it would become almost >>>>>> impossible to do a pattern based brute force. I actually had quite a lot >>>>>> of >>>>>> fun trying to break my own code. :D >>>>>> >>>>>> PS) you have been awarded 1 internets. >>>>>> >>>>>> >>>>>> function get_valid_keys() { >>>>>> // Create key store >>>>>> $_s = array(); >>>>>> >>>>>> // Create valid key ranges (+900 seconds) >>>>>> for($x=300;$x>=900;$x+=300): >>>>>> $_s[] = $this->create_key($offset=$x); >>>>>> endfor; >>>>>> >>>>>> // Create valid key ranges (-900 seconds) >>>>>> for($x=300;$x>=-900;$x-=300): >>>>>> $_s[] = $this->create_key($offset=$x); >>>>>> endfor; >>>>>> >>>>>> $_s[] = $this->create_key(); >>>>>> >>>>>> return $_s; >>>>>> } >>>>>> >>>>>> function create_packed_key() { >>>>>> // Create a new valid key >>>>>> $key = $this->create_key(); >>>>>> >>>>>> // Now generate the packed key >>>>>> $k = array(); >>>>>> // Now convert it into an array >>>>>> for($x=0;$x<strlen($key);$x++): >>>>>> $_v = unpack("H*", $key[$x]); >>>>>> $k[]='\x'.$_v[1]; >>>>>> endfor; >>>>>> >>>>>> // Okay, here is your brand new shiney key, sir :) >>>>>> $m = '"'.implode('","', $k).'"'; >>>>>> $m = strrev($m); >>>>>> $_m = array(); >>>>>> for($x=0;$x<strlen($m);$x++): >>>>>> $_m[]=$m[$x]; >>>>>> endfor; >>>>>> return json_encode(implode("ZPAK", $_m)); >>>>>> } >>>>>> >>>>>> function create_key($offset=0) { >>>>>> // Secret key table, used to mix up the seed >>>>>> $enc = array( >>>>>> 0 => "67892", >>>>>> 1 => "3953", >>>>>> 2 => "49474", >>>>>> 3 => "494755", >>>>>> 4 => "30585", >>>>>> 5 => "30582", >>>>>> 6 => "20485", >>>>>> 7 => "20486", >>>>>> 8 => "97294", >>>>>> 9 => "10284" >>>>>> ); >>>>>> >>>>>> // Generate new seed >>>>>> $time = time(); >>>>>> if ($offset): >>>>>> $time=$time+$offset; >>>>>> endif; >>>>>> $c=(int)($time/$this->_security_key_refresh); >>>>>> $_c = "$c"; >>>>>> >>>>>> // Extract the last 5 digits of the number >>>>>> $char1 = substr($_c, strlen($c)-1, 1); >>>>>> $char2 = substr($_c, strlen($c)-2, 1); >>>>>> $char3 = substr($_c, strlen($c)-3, 1); >>>>>> $char4 = substr($_c, strlen($c)-4, 1); >>>>>> $char5 = substr($_c, strlen($c)-5, 1); >>>>>> >>>>>> // Lookup the modifier from the secret key table >>>>>> $mt1 = $enc[$char1]; >>>>>> $mt2 = $enc[$char2]; >>>>>> $mt3 = $enc[$char3]; >>>>>> $mt4 = $enc[$char4]; >>>>>> $mt5 = $enc[$char5]; >>>>>> >>>>>> // Generate a new key, based on the modifiers >>>>>> $key = round((($c+$mt1) + ($c+$mt2) + ($c+$mt3) + ($c+$mt4) + >>>>>> ($c+$mt5))/256); >>>>>> $key = "$key"; >>>>>> return $key; >>>>>> } >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Wed, Apr 13, 2011 at 3:56 AM, Ryan Sears <[email protected]> wrote: >>>>>> >>>>>>> Me thinks I may have it right (mostly)... >>>>>>> >>>>>>> It seems to be some jquery to append a hidden input element to the >>>>>>> "theform" id (presumably a form on the page ;) ) called "seedkey", and >>>>>>> has a >>>>>>> value of whatever t is evaluated to (which I'm still stuck on as I don't >>>>>>> know jquery much at all, so I can't figure out the s[] array, but I >>>>>>> know it >>>>>>> has something to do with the bracket notation...). >>>>>>> >>>>>>> ================================================= >>>>>>> += Orig =+ >>>>>>> $(function () { >>>>>>> var _0xafd3 = ["\x74\x20\x3D\x20\x22", "", "\x6A\x6F\x69\x6E", >>>>>>> "\x72\x65\x76\x65\x72\x73\x65", "\x73\x70\x6C\x69\x74", >>>>>>> "\x72\x65\x70\x6C\x61\x63\x65", "\x22"]; >>>>>>> >>>>>>> eval(_0xafd3[0] + s[_0xafd3[5]](/ZPAK/gi, >>>>>>> _0xafd3[1])[_0xafd3[5]](/\",\"/gi, _0xafd3[1])[_0xafd3[5]](/\"/gi, >>>>>>> _0xafd3[1])[_0xafd3[4]](_0xafd3[1])[_0xafd3[3]]()[_0xafd3[2]](_0xafd3[1]) >>>>>>> + >>>>>>> _0xafd3[6]); >>>>>>> var _0x5bfa = ["\x3C\x69\x6E\x70\x75\x74\x20\x2F\x3E", >>>>>>> "\x74\x79\x70\x65", "\x68\x69\x64\x64\x65\x6E", "\x61\x74\x74\x72", >>>>>>> "\x6E\x61\x6D\x65", "\x73\x65\x65\x64\x6B\x65\x79", >>>>>>> "\x76\x61\x6C\x75\x65", >>>>>>> "\x61\x70\x70\x65\x6E\x64", "\x23\x74\x68\x65\x66\x6F\x72\x6D"]; >>>>>>> _n = $(_0x5bfa[0]); >>>>>>> _n[_0x5bfa[3]](_0x5bfa[1], _0x5bfa[2]); >>>>>>> _n[_0x5bfa[3]](_0x5bfa[4], _0x5bfa[5]); >>>>>>> _n[_0x5bfa[3]](_0x5bfa[6], t); >>>>>>> $(_0x5bfa[8])[_0x5bfa[7]](_n); >>>>>>> }); >>>>>>> >>>>>>> += De-obfuscated =+ >>>>>>> $(function () { >>>>>>> var _0xafd3 = ['t = "', '', 'join', 'reverse', 'split', >>>>>>> 'replace', '"']; >>>>>>> var _0x5bfa = ['<input />', 'type', 'hidden', 'attr', 'name', >>>>>>> 'seedkey', 'value', 'append', '#theform']; >>>>>>> >>>>>>> eval('t = "' + s['replace'](/ZPAK/gi, >>>>>>> '')['replace'](/\",\"/gi, '')['replace'](/\"/gi, >>>>>>> '')['split']('')['reverse']()['join']('') + '"'); >>>>>>> >>>>>>> _n = $('<input />'); >>>>>>> _n['attr']('type', 'hidden'); >>>>>>> _n['attr']('name', 'seedkey'); >>>>>>> _n['attr']('value', t); >>>>>>> $('#theform')['append'](_n); >>>>>>> }); >>>>>>> >>>>>>> ================================================= >>>>>>> >>>>>>> Fun stuffs. I can haz a internetz? :-P >>>>>>> >>>>>>> Ryan >>>>>>> >>>>>>> >>>>>>> ----- Original Message ----- >>>>>>> From: "Cal Leeming" <[email protected]> >>>>>>> To: [email protected] >>>>>>> Sent: Tuesday, April 12, 2011 5:28:22 PM GMT -05:00 US/Canada Eastern >>>>>>> Subject: [Full-disclosure] guess what this does.. >>>>>>> >>>>>>> $(function() { >>>>>>> var >>>>>>> >>>>>>> _0xafd3=["\x74\x20\x3D\x20\x22","","\x6A\x6F\x69\x6E","\x72\x65\x76\x65\x72\x73\x65","\x73\x70\x6C\x69\x74","\x72\x65\x70\x6C\x61\x63\x65","\x22"];eval(_0xafd3[0]+s[_0xafd3[5]](/ZPAK/gi,_0xafd3[1])[_0xafd3[5]](/\",\"/gi,_0xafd3[1])[_0xafd3[5]](/\"/gi,_0xafd3[1])[_0xafd3[4]](_0xafd3[1])[_0xafd3[3]]()[_0xafd3[2]](_0xafd3[1])+_0xafd3[6]); >>>>>>> var >>>>>>> >>>>>>> _0x5bfa=["\x3C\x69\x6E\x70\x75\x74\x20\x2F\x3E","\x74\x79\x70\x65","\x68\x69\x64\x64\x65\x6E","\x61\x74\x74\x72","\x6E\x61\x6D\x65","\x73\x65\x65\x64\x6B\x65\x79","\x76\x61\x6C\x75\x65","\x61\x70\x70\x65\x6E\x64","\x23\x74\x68\x65\x66\x6F\x72\x6D"];_n=$(_0x5bfa[0]);_n[_0x5bfa[3]](_0x5bfa[1],_0x5bfa[2]);_n[_0x5bfa[3]](_0x5bfa[4],_0x5bfa[5]);_n[_0x5bfa[3]](_0x5bfa[6],t);$(_0x5bfa[8])[_0x5bfa[7]](_n); >>>>>>> }); >>>>>>> >>>>>>> enjoy ;p >>>>>>> >>>>>>> ps) yes I obfuscated this, and no it doesn't contain any nasties. >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Full-Disclosure - We believe in it. >>>>>>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html >>>>>>> Hosted and sponsored by Secunia - http://secunia.com/ >>>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Full-Disclosure - We believe in it. >>>>>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html >>>>>> Hosted and sponsored by Secunia - http://secunia.com/ >>>>>> >>>>> >>>>> >>>> >>> >>> _______________________________________________ >>> Full-Disclosure - We believe in it. >>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html >>> Hosted and sponsored by Secunia - http://secunia.com/ >>> >> >> >> >> -- >> I’m a hot-wired, heat seeking, warm-hearted cool customer, voice >> activated and bio-degradable. I interface with my database, my database is >> in cyberspace, so I’m interactive, I’m hyperactive and from time to time I’m >> radioactive. >> > > > _______________________________________________ > Full-Disclosure - We believe in it. > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > Hosted and sponsored by Secunia - http://secunia.com/ >
_______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
