Authenticated remote attackers can achieve full root-level code execution on Altice Labs GR140DG routers by exploiting an OS command injection flaw in the traceroute diagnostic handler.

Similar to the ping handler vulnerability, the traceroute handler in /bin/httpd_clientside fails to sanitize user input in the destAddr parameter. This allows authenticated attackers to perform shell command substitution and execute commands with root privileges.

The CVSS score of 8.8 highlights the critical nature of this vulnerability, as it provides a pathway for total control over the networking hardware. An attacker with access to the management interface could leverage this to gain persistence, conduct man-in-the-middle attacks, or utilize the device as a node in a botnet.

Immediate Action: Apply the latest firmware updates provided by the vendor to remediate the command injection flaw in the diagnostic tools.

Proactive Monitoring: Review router audit logs for signs of unauthorized diagnostic tool usage or unexpected outbound connections.

Compensating Controls: Strictly limit administrative access to the router's management interface to secure, dedicated management workstations.

Public Exploit Available: false

This vulnerability represents a significant risk to network integrity. Immediate patching is required to ensure that the router cannot be leveraged by malicious actors to compromise the local network or internet connectivity.