Overview
In this blog post, we will examine the critical vulnerabilities discovered in several models of Blink routers, identified as CVE-2025-45987. These vulnerabilities can lead to command injection attacks, which have the potential to compromise the system or lead to data leakage. The affected routers are widely used in both residential and commercial environments, making this a significant issue of concern for many. With a CVSS severity score of 9.8, these vulnerabilities must be addressed immediately to prevent potential security breaches.
Vulnerability Summary
CVE ID: CVE-2025-45987
Severity: Critical with a CVSS score of 9.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
Blink BL-WR9000 | V2.4.9
Blink BL-AC2100_AZ3 | V1.0.4
Blink BL-X10_AC8 | v1.0.5
Blink BL-LTE300 | v1.2.3
Blink BL-F1200_AT1 | v1.0.0
Blink BL-X26_AC8 | v1.2.8
Blink BLAC450M_AE4 | v4.0.0
Blink BL-X26_DA3 | v1.2.7
How the Exploit Works
The vulnerabilities stem from improper validation of the ‘dns1’ and ‘dns2’ parameters in the ‘bs_SetDNSInfo’ function. This lack of validation allows an attacker to inject and execute arbitrary commands on the system. The attacker can exploit this vulnerability remotely over the network without requiring any authentication or user interaction.
Conceptual Example Code
To illustrate the vulnerability, consider the following hypothetical HTTP request. In this example, the attacker sends a malicious POST request to the router’s web interface, injecting arbitrary commands into the ‘dns1’ and ‘dns2’ parameters.
POST /bs_SetDNSInfo HTTP/1.1
Host: target_blink_router
Content-Type: application/x-www-form-urlencoded
dns1=8.8.8.8;%20malicious_command&dns2=8.8.4.4;%20malicious_commandMitigation
Users of the affected Blink routers should immediately apply the patches provided by the vendor. If a patch is not yet available or cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can be configured to block or alert on suspicious DNS settings manipulation, thereby preventing exploitation of this vulnerability.
Remember, regular patching and system updates are essential to maintain a strong security posture. Ignoring such vulnerabilities can expose your network to potential compromises and data breaches. Stay updated, stay secure.