Overview
The cybersecurity landscape is always fraught with threats, some more severe than others. In this post, we’ll delve into a critical vulnerability that affects multiple versions of Blink routers. The vulnerability, identified as CVE-2025-45988, presents a significant risk due to the potential for system compromise or data leakage. It is a command injection vulnerability, which is a type of security vulnerability that allows an attacker to execute arbitrary commands on a host system. With a CVSS Severity Score of 9.8, this issue is of serious concern and demands immediate attention.
Vulnerability Summary
CVE ID: CVE-2025-45988
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
BL-WR9000 | V2.4.9
BL-AC2100_AZ3 | V1.0.4
BL-X10_AC8 | v1.0.5
BL-LTE300 | v1.2.3
BL-F1200_AT1 | v1.0.0
BL-X26_AC8 | v1.2.8
BLAC450M_AE4 | v4.0.0
BL-X26_DA3 | v1.2.7
How the Exploit Works
The vulnerability is a result of poor input validation within the bs_SetCmd function. This function, which is designed to handle command parameters, fails to properly sanitize the ‘cmd’ input. An attacker can exploit this vulnerability by sending a specially crafted request containing malicious commands. Once the command is processed by the bs_SetCmd function, the injected commands are executed with the privileges of the application.
Conceptual Example Code
Below is a conceptual example of how an attacker might exploit the vulnerability. The attacker sends a POST request to the vulnerable endpoint on the router with a malicious payload that contains the injected commands:
POST /bs_SetCmd HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "cmd": "; injected_command_here ;" }The router’s bs_SetCmd function fails to validate and sanitize the POST request, leading to the execution of the injected command. The severity of this vulnerability can’t be overstated, as it grants an attacker the ability to run any command on the system with the privileges of the application, leading to a potential system compromise or data leakage.
Mitigation
The most effective mitigation for this vulnerability is to apply the vendor-provided patch. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These tools can help to detect and block malicious requests that attempt to exploit this vulnerability. However, these are only temporary measures and cannot substitute for applying the vendor patch.
As a best practice, always apply the latest security patches and updates to all your systems and devices. Regular patching is one of the most effective ways to protect your systems from known vulnerabilities.