Overview
CVE-2025-63216 describes a critical authentication bypass vulnerability affecting Itel DAB Gateways (IDGat build c041640a). This flaw stems from improper JWT (JSON Web Token) validation across different devices. An attacker can exploit this vulnerability by reusing a valid JWT token obtained from one Itel DAB Gateway to authenticate and gain administrative access to *any* other device running the same firmware. This effectively allows for a complete compromise of affected devices, regardless of individual passwords or network configurations.
Technical Details
The core issue lies in the flawed implementation of JWT validation within the Itel DAB Gateway’s firmware. Specifically, the device fails to properly verify the origin or intended recipient of a JWT. This means that once a valid JWT is generated for one device, it can be used to authenticate against any other device running the same, vulnerable firmware version. The JWT is likely not tied to any device-specific identifier or any other security context that would prevent this reuse. This improper validation opens the door for attackers to gain unauthorized administrative access.
The vulnerable build is IDGat c041640a.
CVSS Analysis
Due to the missing CVSS score, a proper CVSS analysis is impossible. However, considering the severity and impact, this vulnerability likely warrants a Critical severity rating and a CVSS score of 9.0 or higher, pending official analysis. A successful exploit allows for complete remote takeover of the affected devices, with no user interaction required after initial token capture.
Possible Impact
The potential impact of CVE-2025-63216 is significant. A successful exploit can lead to:
- Full device compromise: Attackers gain complete administrative control over the Itel DAB Gateway.
- Configuration manipulation: Attackers can modify device settings, potentially disrupting services or gaining access to sensitive data.
- Malware deployment: Compromised devices can be used as a foothold for spreading malware to other devices on the network.
- Data theft: Depending on the Gateway’s function, attackers might be able to access and steal sensitive information.
- Denial of Service (DoS): Attackers could intentionally disrupt the Gateway’s functionality, rendering it unusable.
Mitigation and Patch Steps
The primary mitigation strategy is to update to a patched firmware version as soon as it becomes available from Itel. Given the severity of this vulnerability, Itel should prioritize releasing a patch. In the meantime, consider the following temporary mitigation steps:
- Isolate affected devices: If possible, isolate the Itel DAB Gateway from critical network segments to limit the potential impact of a compromise.
- Monitor network traffic: Closely monitor network traffic to and from the Itel DAB Gateway for any suspicious activity.
- Change default passwords (if applicable): While this vulnerability bypasses authentication, changing any default passwords might offer a slight layer of defense in depth.
- Contact Itel Support: Reach out to Itel support for specific guidance and timelines for a firmware patch.
Important: Keep checking the Itel website for firmware updates and security advisories.
