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

The vulnerability exists in the /bin/httpd_clientside binary, where unsanitized user input provided via the destAddr parameter is passed directly to a system call. This allows an authenticated attacker to inject arbitrary shell commands.

The CVSS score of 8.8 reflects the extreme severity of this issue, as it grants an attacker root access to the underlying operating system of the router. This compromise could allow an attacker to intercept network traffic, pivot into internal networks, or permanently disable the device, leading to significant security and operational risks.

Immediate Action: Update the router firmware to a version that addresses this command injection vulnerability as provided by the ISP or vendor.

Proactive Monitoring: Monitor router management logs for unexpected shell command patterns or configuration changes initiated via the web interface.

Compensating Controls: Disable remote access to the router's web management interface and restrict access to trusted internal IP addresses only.

Public Exploit Available: false

Root-level command injection is a critical vulnerability that effectively nullifies all security controls on the device. Users must coordinate with their service provider to ensure the affected routers are patched or replaced immediately.