Published: 2025-12-04
Overview
CVE-2025-29269 details a command injection vulnerability discovered in ALLNET ALL-RUT22GW v3.3.8 industrial LTE cellular routers. The vulnerability resides in the `popen.cgi` endpoint and can be exploited via the `command` parameter. This allows attackers to inject and execute arbitrary OS commands on the affected device.
Technical Details
The `popen.cgi` endpoint is intended to execute specific commands on the router. However, insufficient input validation on the `command` parameter allows an attacker to inject malicious code alongside the intended command. This injected code is then executed with the privileges of the web server process, potentially granting the attacker complete control over the router.
Specifically, the lack of proper sanitization of the `command` parameter means that characters typically used to chain or execute commands (e.g., ;, &&, ||, backticks) are not filtered. This allows an attacker to append their own commands to the intended command, effectively hijacking the execution flow.
CVSS Analysis
Due to the Common Vulnerability Scoring System (CVSS) score not being available at the time of this article, we cannot determine the severity rating based on a number. However, given the nature of a command injection vulnerability and its potential impact on the device, it can be safely assumed that exploitation could lead to severe consequences.
Possible Impact
The exploitation of CVE-2025-29269 can have significant consequences:
- Complete System Compromise: Attackers can gain root-level access to the router.
- Data Exfiltration: Sensitive data stored on the router, such as configuration files, credentials, and network information, can be stolen.
- Malware Installation: The router can be infected with malware, turning it into a botnet node or a persistent backdoor.
- Denial of Service (DoS): The router’s functionality can be disrupted, leading to a denial of service for connected devices.
- Lateral Movement: Compromised routers can be used as a pivot point to attack other devices on the network.
Mitigation or Patch Steps
The primary mitigation strategy is to update the ALLNET ALL-RUT22GW router to a patched firmware version that addresses this vulnerability. If a patch is not yet available, the following workarounds may help reduce the risk:
- Disable Remote Access: If possible, disable remote access to the router’s web interface.
- Network Segmentation: Isolate the router on a separate network segment to limit the potential impact of a compromise.
- Input Validation: Implement robust input validation and sanitization on the `command` parameter in the `popen.cgi` endpoint (for developers).
- Monitor Network Traffic: Monitor network traffic for suspicious activity originating from the router.
It is highly recommended to check the ALLNET website for the latest firmware updates and security advisories.
