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CVE-2025-57201 is an authenticated command injection vulnerability discovered in the SMB server function of AVTECH SECURITY Corporation’s DGM1104 network video recorder, specifically in firmware versions FullImg-1015, FullImg-1004, FullImg-1006, and FullImg-1003. The flaw resides in the `cgibox` binary, which handles the mounting of remote SMB shares. When an administrator configures an SMB share, the device reads previously stored SMB configuration settings from flash memory. These settings – including the share address, username, password, and mount options – are concatenated into a command string without any sanitization or validation. That string is then passed directly to the `system()` function.
Because the web API endpoint that receives SMB configuration parameters does not neutralize special shell characters (such as backticks, semicolons, or pipes), an authenticated attacker with low privileges can inject arbitrary operating system commands. The injection occurs by supplying a maliciously crafted value to the `Network.NetworkShare.Address` parameter. When the device later attempts to mount the SMB share (either immediately or after a reboot), the unsanitized string is executed as root, leading to full remote code execution on the embedded Linux device.
This attack vector is network‑based, requires low attack complexity, does not need user interaction, and results in high impacts on confidentiality, integrity, and availability. A public proof‑of‑concept (PoC) exploit script is available on GitHub, demonstrating how an attacker can inject commands to obtain a reverse shell. AVTECH has not yet released an official patch, making all affected devices (including DGM1104, DGM1105, AVM2200, and many other IP camera models) highly exposed.
The vulnerability was assigned CWE‑77 (Improper Neutralization of Special Elements used in a Command) and carries a CVSS base score of 8.8 (High). The only recommended mitigations at this time are to disable the SMB server functionality if not strictly required, isolate affected devices from untrusted networks, and monitor for suspicious command executions.
DailyCVE Form:
Platform: AVTECH DGM1104
Version: FullImg-1015/1004/1006/1003
Vulnerability: Authenticated command injection
Severity: Critical (CVSS 8.8)
Date: 2025-12-03
Prediction: 2026-08-01 (estimated)
What Undercode Say:
> Analytics: 34% EPSS, 8.8 CVSS, 55.9% percentile
Bash commands / PoC snippet:
Inject command via SMB address field (using PoC logic) python3 test_smb_poc.py --target-ip 192.168.1.100 --username admin --password admin --command "id > /tmp/pwned"
Code (Python – exploit core):
new_smb_fields["Network.NetworkShare.Address"] = f"<code>{command}</code>"
device.set_config_fields(config_values=new_smb_fields)
How Exploit:
An attacker logs into the web management interface (default credentials admin:admin often unchanged). Using the PoC script, the `Network.NetworkShare.Address` field is poisoned with backticks containing the desired OS command (e.g., id, wget, or a reverse‑shell one‑liner). The device later invokes `system()` with the unsanitized string, executing the command as root.
Protection:
- Disable the SMB server function in the device settings.
- Isolate the device behind a firewall; block inbound SMB (port 445) and web management ports from untrusted networks.
- Apply network segmentation to limit lateral movement.
- Use an IPS/IDS signature (e.g., Check Point CPAI‑2025‑7686) that detects attempts to set the `Network.NetworkShare.Address` parameter to a value containing shell metacharacters.
- Monitor system logs for unexpected `system()` calls or outbound connections from the device.
Impact:
Successful exploitation grants an attacker unauthenticated (after obtaining low‑privilege credentials) root access to the device. This allows:
– Full control over the video recorder (view/manipulate footage, disable recording).
– Use the device as a pivot point to attack other systems on the same network.
– Install persistent backdoors, cryptocurrency miners, or botnet agents.
– Compromise the confidentiality, integrity, and availability of the entire surveillance infrastructure.
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Sources:
Reported By: nvd.nist.gov
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