Smartbedded patches a command injection flaw in Meteobridge
Take action: If you use a MeteoBridge device, make sure it's not directly accessible from the internet and isolate it from the rest of the networks. Then upgrade to firmware version 6.2 or later. As a developer, make sure NEVER to execute user input content, because you can't know what will be inserted. Remember - eval is evil!
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Smartbedded has addressed a security vulnerability in its MeteoBridge firmware that allows unauthenticated attackers to execute arbitrary commands with root privileges on affected devices.
MeteoBridge is a specialized device designed to connect personal weather stations to public weather networks like Weather Underground, allowing users to share their microclimate data over the internet.
The flaw, tracked as CVE-2025-4008 (CVSS score 8.7), is a remote command execution vulnerability that enables attackers to gain complete control of MeteoBridge devices, potentially leading to data theft, system compromise, or the devices being used as entry points into larger networks.
The technical root cause of this vulnerability lies within the MeteoBridge web interface, which is built using CGI shell scripts and C programming. The web interface exposes an endpoint through /cgi-bin/template.cgi that contains a command injection flaw due to insecure use of eval calls. User-controlled input from the $QUERY_STRING parameter is parsed and used unsanitized in an eval call, allowing attackers to inject and execute arbitrary shell commands.
The severity of this vulnerability is amplified by an authentication bypass mechanism. While the MeteoBridge system typically requires basic authentication for accessing protected directories like cgi-bin, exports, charts, and backup, the vulnerable CGI script is also accessible through the public directory, which remains unprotected. This configuration flaw allows completely unauthenticated attackers to exploit the command injection vulnerability remotely.
The vulnerability was discovered through automated bash static code analysis by ONEKEY Research Lab.
Affected versions are Smartbedded MeteoBridge Firmware versions 6.1 and earlier are vulnerable to this critical security flaw.
The vulnerability has been patched in MeteoBridge firmware version 6.2, which users should upgrade to immediately.
The vendor, Smartbedded, has emphasized in their advisory that exposing MeteoBridge devices to the internet is not recommended, as this creates the precondition for exploiting security vulnerabilities. However, the reality is that many devices remain internet-accessible, creating ongoing risk for users who have not implemented proper network segmentation or firewall protections.
Users can verify their current MeteoBridge version through the device's web interface and should immediately upgrade to version 6.2 or later. Ofcouurse, users should ensure their MeteoBridge devices are not directly accessible from the internet and are properly segmented within their networks with appropriate firewall rules in place.
