Horizon Alert
Summary of the vulnerability and why it matters
DrayTek Vigor devices are vulnerable due to a flaw in how they process filenames for script uploads. This weakness allows attackers to execute commands on the affected devices. The potential impact includes unauthorized access and control over the network infrastructure.
- Vulnerable component: DrayTek Vigor devices
- Core weakness: Command injection via script upload
- Main business impact: Unauthorized command execution
Attack Path
How an attacker could exploit the issue
This vulnerability allows an attacker to execute arbitrary commands on affected DrayTek devices. The attack targets a specific upload function within the device's web interface. By manipulating a filename with special characters, an attacker can inject and run commands, potentially leading to unauthorized access or control of the device.
- Exposure on public-facing network interfaces.
- Attacker crafts a malicious filename.
- Command execution and device compromise.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows for remote command execution on affected DrayTek devices. Attackers can leverage this by sending specially crafted filenames to compromise the system. The impact could include unauthorized access to sensitive data, disruption of network services, and the potential for further network compromise. Organizations utilizing these devices should consider this a high-priority issue requiring immediate attention.
- Likely attacker skill level: Low.
- Required access or conditions: Network access.
- Business risk or urgency: High.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Remote command execution is possible on specific DrayTek devices due to a vulnerability in the cgi-bin/mainfunction.cgi/cvmcfgupload component. This flaw allows attackers to inject commands via specially crafted filenames, potentially leading to unauthorized system access and data compromise. The vulnerability affects external-facing network devices and presents a significant risk to organizational security.
- Identify all affected DrayTek devices.
- Isolate exposed devices or restrict access.
- Apply vendor firmware updates and verify.
- Monitor network activity for suspicious behavior.
