CVE-2017-16186: Directory Traversal in 360class.jansenhm

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Background

360class.jansenhm is an npm package used for local development. It provides functionality for resolving relative file paths. However, it is vulnerable to a directory traversal attack, which allows a malicious actor to access files outside of the intended directory root. This can lead to the disclosure of private files on the vulnerable system.

Vulnerability Detail

The vulnerability in 360class.jansenhm arises from its improper handling of file paths. By exploiting this vulnerability, an attacker can construct a specially crafted request that includes relative file path traversal sequences. This allows them to access files outside of the intended directory root. For example, an attacker can send a GET request to access the '/etc/passwd' file on the system. This can result in the exposure of sensitive information, such as user credentials or other confidential data.

Workaround

As there is no patch available, a possible workaround is to manually sanitize and validate file paths before using them with 360class.jansenhm. This can help prevent directory traversal attacks. Here is an example of how to sanitize a file path in Node.js:

const path = require('path');

function sanitizeFilePath(filePath) {
  const rootDir = '/path/to/root/directory'; // Specify the root directory
  const resolvedPath = path.resolve(rootDir, filePath);

  if (!resolvedPath.startsWith(rootDir)) {
    throw new Error('Invalid file path');
  }

  return resolvedPath;
}

In this example, the sanitizeFilePath function takes a file path as input and resolves it against a specified root directory. It then checks if the resolved path starts with the root directory to ensure it is within the intended boundaries. If not, an error is thrown.

Conclusion

In conclusion, 360class.jansenhm is vulnerable to a directory traversal attack, which allows an attacker to access files outside of the intended directory root. There is no patch available for this vulnerability, so it is recommended to only use this package for local development purposes. If the functionality provided by this package is required for production, it is advised to switch to a different package that does not have this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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