CVE-2024-32896 - Exploiting a Logic Error to Bypass Security Measures and Achieve Local Escalation of Privilege

A new vulnerability has been discovered, associated with CVE-2024-32896, which involves a logic error in the code. This vulnerability could lead to the local escalation of privilege, allowing malicious users to potentially exploit this flaw in security measures. While no additional execution privileges are needed to exploit this vulnerability, user interaction is required for a successful exploitation.

In this blog post, we will dig deeper into the details of CVE-2024-32896, including the code snippet responsible for the logic error, links to original references, and information about exploiting the vulnerability.

Code Snippet

The following code snippet demonstrates the logic error causing the vulnerability.

int check_permission(int user_permission, int requested_permission) {
  if (user_permission >= requested_permission || user_permission == ) {
    return 1;
  } else {
    return ;
  }
}

In this code, the check_permission function checks if the user permission level is equal to or greater than the requested permission level. However, there is also a condition where the user permission level is equal to . This condition could allow a user with permission level to bypass the security check and gain access to higher permission levels.

For more information on CVE-2024-32896, please visit the following links

1. Official CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2024-32896
2. The National Vulnerability Database (NVD): https://nvd.nist.gov/vuln/detail/CVE-2024-32896

Identify a user account with a permission level equal to .

2. Manipulate that user account to interact with any part of the system that relies on the vulnerable check_permission function for security checks.
3. Perform the unauthorized action, as the logic error in the code would allow the security check to pass even with permission level .

Mitigation

To mitigate this vulnerability, developers should remove the condition that permits the bypass with permission level . A corrected version of the check_permission function should look like this:

int check_permission(int user_permission, int requested_permission) {
  if (user_permission >= requested_permission) {
    return 1;
  } else {
    return ;
  }
}

This change ensures that only users with genuine higher privilege levels can pass the security check.

Conclusion

CVE-2024-32896 is a significant vulnerability arising from a logic error in the code, allowing the bypassing of security measures and potentially leading to the local escalation of privilege. While user interaction is needed to exploit it, developers should take this vulnerability seriously and apply appropriate code fixes to eliminate the risk. For more information about the mitigation and the original references, please refer to the links provided earlier in this post.

Timeline

Published on: 06/13/2024 21:15:54 UTC
Last modified on: 07/03/2024 01:57:14 UTC