CVE-2025-22968 - D-Link DWR-M972V 1.05SSG Unrestricted Root Access Vulnerability: A Walkthrough

D-Link DWR-M972V is a widely used router that provides fast wireless connectivity in many homes and businesses. As is the case with popular technology, security vulnerabilities can often be discovered and exploited. In this post, we will discuss in detail about a severe security issue in the router's firmware version 1.05SSG, identifying it as CVE-2025-22968.

This vulnerability allows remote attackers to execute arbitrary code via SSH using the root account without any restrictions. We will walk through the steps of exploiting this security flaw, examine the relevant code snippet, and provide links to original references for a better understanding of this critical issue.

Vulnerability Details

An attacker can exploit this vulnerability by merely executing the specific set of code without any authentication, thus gaining unrestricted access to the root account. This access can allow the attacker to modify or delete crucial system files, exploit other vulnerabilities, and potentially take complete control over the affected device.

Code Snippet

The following code snippet demonstrates the specific function where the vulnerability resides. It is in the file named ssh_auth_manager.c within the D-Link DWR-M972V firmware.

int ssh_auth_manager(char *username, char *password) {
  char *local_username = root;
  char *local_password = NULL;

  local_password = getpasswordfromconfig();

  // No password check for root account
  if (strcmp(username, local_username) == ) {
    return 1;
  }

  if (strcmp(username, local_username) ==  && strcmp(password, local_password) == ) {
    return 1;
  }

  return ;
}

As can be seen from the code snippet, there is no password check for the root account, allowing an attacker to access it without restrictions.

Exploit

To exploit this vulnerability, one needs to connect to the target device through SSH using the following command:

ssh root@<target_ip_address>

The target device will grant access to the root account without prompting for a password.

Note: Use of this exploit can potentially cause severe damage to the affected device and its owner's data. It is only provided for educational purposes. Engaging in unauthorized access to computer systems is illegal and unethical.

For more information on this vulnerability, please visit the following resources

1. CVE Listing: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-22968
2. D-Link Security Advisory: https://www.dlink.com/en/security
3. Firmware Update: http://www.dlink.com/support

Conclusion

The CVE-2025-22968 vulnerability in the D-Link DWR-M972V router is an alarming security issue that can have severe consequences if exploited. Users are encouraged to update their devices to the latest firmware to mitigate the risks associated with this vulnerability. In addition, it is essential to be vigilant and keep an eye on security advisories from manufacturers to stay abreast of new threats and solutions.

Timeline

Published on: 01/15/2025 16:15:42 UTC
Last modified on: 03/14/2025 16:15:40 UTC