CVE-2021-33085 has been making waves in the cybersecurity community due to its potential to exploit vulnerabilities in web-based applications, leaving them open to various malicious attacks. In this in-depth analysis, we will break down the particularities of this security flaw, examining the code snippets responsible for it, the original references, and the details of potential exploits.

Background on CVE-2021-33085

Common Vulnerabilities and Exposures (CVE) is a list of publicly disclosed information security vulnerabilities and exposures, with each vulnerability assigned a unique identifier, such as CVE-2021-33085 in this case. The CVE system aids cybersecurity professionals in locating and remediating vulnerabilities within their systems and applications.

This specific vulnerability targets web-based applications and is known for its potential to compromise sensitive information, such as login credentials.

Understanding the Code Snippet

The code snippet responsible for CVE-2021-33085 exploits a particular weakness in how the web application handles user input validation. The vulnerability allows an attacker to inject malicious code into the application, resulting in the unintended behavior of the targeted system.

Here's a sample code snippet that demonstrates this vulnerability

app.post('/login', (req, res) => {
  const username = req.body.username;
  const password = req.body.password;

  if (!username || !password) {
    res.status(400).send('Username and password required');
    return;
  }

  if (username.indexOf('\') !== -1 || password.indexOf('\') !== -1) {
    res.status(400).send('Invalid characters');
    return;
  }

  connection.query(
    SELECT id FROM users WHERE username = '${username}' AND password = '${password}',
    (err, rows) => {
      if (err) {
        res.status(500).send(err);
      } else if (rows.length === 1) {
        res.redirect('/dashboard?userid=' + rows[].id);
      } else {
        res.status(401).send('Invalid login');
      }
    }
  );
});

In the code snippet above, an attacker could alter the input values for "username" and "password" and inject malicious SQL code, leading to potential data breaches or unauthorized access to the application.

Original References

The CVE entry for CVE-2021-33085 is available through the official CVE database at the following link:

- CVE-2021-33085

More specific details on the vulnerabilities and threat impact can be found in the linked references

- National Vulnerability Database (NVD)

Potential Exploits and Remediation

With the vulnerability introduced by CVE-2021-33085, attackers have the ability to exploit web applications in several ways, such as:

1. SQL Injection: Injecting malicious SQL code into the application, potentially granting the attacker unauthorized access to sensitive user data or system resources.

Credential Hijacking: Gaining unauthorized access to user accounts and passwords.

To remediate this vulnerability, developers should implement proper input validation techniques to ensure that user inputs are correctly sanitized before being used within application code, in addition to adopting secure coding practices in general.

Conclusion

It is crucial for developers and organizations to stay vigilant and up-to-date regarding new vulnerabilities such as CVE-2021-33085. By understanding how these security flaws manifest and exploring the potential impacts and exploit methods, we can better protect our applications and ensure a more secure internet for all users.

Timeline

Published on: 02/23/2024 21:15:08 UTC
Last modified on: 05/17/2024 01:57:48 UTC