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Introduction
A critical security vulnerability has been identified in the EFM ipTIME A3004T router, specifically in firmware version 14.19.0. The flaw, tracked as GHSA-mrhv-3wcw-74fh, resides in the `show_debug_screen` function of the `/sess-bin/timepro.cgi` component, which handles administrative password management. This vulnerability allows for command injection via a maliciously crafted input argument, potentially enabling remote attackers to execute arbitrary commands on affected devices.
The issue was disclosed publicly after the vendor, EFM, failed to respond to early notifications. An exploit has been made available, increasing the risk of exploitation in the wild. While the attack complexity is rated as high, the exploitability remains a concern due to the public availability of proof-of-concept code.
Technical Details
Vulnerability Overview
The flaw stems from improper input validation in the `show_debug_screen` function of the `timepro.cgi` file. By manipulating the argument `aaksjdkfj` with a specially crafted payload—such as `!@dnjsrureljrm*&`—an attacker can bypass security controls and inject arbitrary commands into the system.
Exploitation Mechanism
1. Remote Attack Vector: The vulnerability is exploitable remotely, meaning an attacker does not need physical access to the device.
2. Command Injection: The injected payload can execute system-level commands, potentially leading to full system compromise.
3. Exploit Availability: A public exploit has been released, lowering the barrier for potential attackers.
Affected Component
- Component: Administrator Password Handler (`/sess-bin/timepro.cgi`)
- Function: `show_debug_screen`
- Input Argument: `aaksjdkfj`
Impact Assessment
Potential Consequences
- Unauthorized Access: Attackers could gain administrative privileges on the router.
- Data Theft: Sensitive information, including user credentials and network traffic, may be exposed.
- Network Disruption: Malicious commands could disrupt router functionality or compromise connected devices.
- Lateral Movement: Compromised routers could serve as entry points for further attacks within the network.
Severity Rating
- Exploitability: Difficult (due to high attack complexity).
- Impact: High (potential for full system compromise).
- Public Exploit: Available, increasing risk.
Who Is Affected
Affected Devices
- EFM ipTIME A3004T routers running firmware version 14.19.0.
- Other models or firmware versions may also be vulnerable but have not been confirmed.
Affected Users
- Home and business users relying on the EFM ipTIME A3004T router.
- Network administrators managing multiple instances of the device.
How to Fix
Immediate Mitigations
1. Disconnect from the Network:
- Temporarily remove the affected router from the network to prevent exploitation.
2. Update Firmware (If Available):
- Check for official firmware updates from EFM that patch this vulnerability.
- Apply the update as soon as it becomes available.
3. Restrict Remote Access:
- Disable remote administration features if not required.
- Use a firewall to block external access to the router’s management interface.
4. Change Default Credentials:
- Ensure strong, unique passwords are set for administrative accounts.
Long-Term Recommendations
1. Monitor for Updates:
- Regularly check EFM’s official channels for security advisories and patches.
2. Deploy Network Segmentation:
- Isolate critical devices from the main network to limit lateral movement.
3. Implement Intrusion Detection:
- Use network monitoring tools to detect unusual activity targeting the router.
4. Consider Alternative Hardware:
- If EFM does not release a patch, evaluate migrating to a more secure router model.
Vendor Communication
- If possible, contact EFM directly to inquire about a patch or mitigation guidance.
Conclusion
The GHSA-mrhv-3wcw-74fh vulnerability in the EFM ipTIME A3004T router highlights the importance of proactive security measures for network infrastructure. While the attack complexity is high, the availability of a public exploit necessitates immediate action. Users should prioritize firmware updates, restrict remote access, and monitor for suspicious activity to mitigate risks.
For further details, refer to the official GitHub Security Advisory (GHSA) or contact EFM support.
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