Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability allows unauthenticated attackers to run commands on a WiFi extender remotely. This could let them take control of the device and potentially disrupt network services.
- Attackers can execute commands remotely.
- It impacts the device's core functionality.
- Access can be achieved without authentication.
Attack Path
How an attacker could exploit the issue
An unauthenticated remote attacker can exploit this vulnerability by sending a crafted POST request to the WDR201A WiFi Extender's `makeRequest.cgi` binary. By injecting malicious characters into the `set_time` or `StartSniffer` functions, the attacker can bypass input sanitization and execute arbitrary shell commands with limited length. This allows for remote code execution on the vulnerable device.
- Attackers need network access.
- Vulnerable surface is `makeRequest.cgi`.
- Input sanitization bypass is key.
Live Threat
Current exploitation, exposure, and threat context
This OS command injection vulnerability in a WiFi extender allows unauthenticated remote attackers to execute arbitrary shell commands. While the technical exploitability is high due to unauthenticated network access and critical impact, attackers may find it less appealing for widespread exploitation due to the niche nature of the target device and its typical deployment within private networks.
- Exploit code is publicly available.
- Device is unlikely to be internet-facing.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize investigating and containing the WDR201A WiFi Extender (FW LFMZX28040922V1.02) due to its critical OS command injection vulnerability, which allows unauthenticated remote command execution. Since this vulnerability is actively exploited and has a public exploit, consider taking affected services offline or isolating them immediately.
- Identify and isolate affected extenders.
- Monitor network traffic for suspicious POST requests.
- If isolation is not possible, restrict access to the extender's management interface.
