带回显版本的漏洞利用脚本

Overview

CVE-2021-21978

带回显版本的漏洞利用脚本,更简单的方式

0. 漏洞信息

VMware View Planner Web管理界面存在一个上传日志功能文件的入口,没有进行认证且写入的日志文件路径用户可控,通过覆盖上传日志功能文件log_upload_wsgi.py,即可实现RCE

漏洞代码:

def application(environ, start_response):
    logger.debug("application called")

    if environ['REQUEST_METHOD'] == 'POST':
        post = cgi.FieldStorage(
            fp=environ['wsgi.input'],
            environ=environ,
            keep_blank_values=True
        )

        # TO DO: Puth path in some config or read from config is already available
        resultBasePath = "/etc/httpd/html/vpresults"
        try:
            filedata = post["logfile"]
            metaData = post["logMetaData"]

            if metaData.value:
                logFileJson = LogFileJson.from_json(metaData.value)

            if not os.path.exists(os.path.join(resultBasePath, logFileJson.itrLogPath)):
                os.makedirs(os.path.join(resultBasePath, logFileJson.itrLogPath))

            if filedata.file:
                if (logFileJson.logFileType == agentlogFileType.WORKLOAD_ZIP_LOG):
                    filePath = os.path.join(resultBasePath, logFileJson.itrLogPath, WORKLOAD_LOG_ZIP_ARCHIVE_FILE_NAME.format(str(logFileJson.workloadID)))
                else:
                    filePath = os.path.join(resultBasePath, logFileJson.itrLogPath, logFileJson.logFileType)
                with open(filePath, 'wb') as output_file:
                    while True:
                        data = filedata.file.read(1024)
                        # End of file
                        if not data:
                            break
                        output_file.write(data)

1. 依赖

pip install requests

2. 检测

git clone https://github.com/skytina/CVE-2021-21978
cd CVE-2021-21978
python3 CVE-2021-21978.py https://192.168.80.3/

image-20210305162131318

3. 漏洞利用

漏洞利用脚本会重写log_upload_wsgi.py,让它成为一个后门

image-20210305162339613

4. 参考链接

漏洞利用来源:https://twitter.com/osama_hroot/status/1367258907601698816

VMware官方公告: https://www.vmware.com/security/advisories/VMSA-2021-0003.html

声明

  • 工具仅用于安全人员安全测试与研究使用,任何未授权检测造成的直接或者间接的后果及损失,均由使用者本人负责。
  • The tool is only used for security testing and research by security personnel. Any direct or indirect consequences and losses caused by unauthorized testing are the responsibility of the user.

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