Horizon Alert
Summary of the vulnerability and why it matters
The React Native Community CLI's Metro Development Server can be exploited by external attackers. This flaw enables attackers to execute arbitrary code on affected systems through network requests. The impact can include unauthorized system control and data compromise.
- Vulnerable server component
- OS command injection
- Arbitrary code execution
Attack Path
How an attacker could exploit the issue
The React Native Community CLI's Metro Development Server, when exposed externally, presents an opportunity for attackers. By sending a crafted POST request to a specific endpoint, an unauthenticated network attacker can achieve command injection. This allows for the execution of arbitrary code or shell commands on the affected system, potentially leading to significant business risk.
- External network exposure required.
- Attacker sends POST request.
- Executes arbitrary code or commands.
Live Threat
Current exploitation, exposure, and threat context
The React Native Community CLI contains a critical vulnerability allowing unauthenticated network attackers to execute arbitrary code. This occurs through an endpoint on the Metro Development Server, which binds to external interfaces by default. Attackers can send a POST request to run executables or, on Windows, shell commands with controlled arguments.
- Likely attacker skill level: Basic.
- Required access or conditions: Network access.
- Business risk or urgency: High.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
The React Native Community CLI's Metro Development Server has a vulnerability allowing unauthenticated attackers to execute arbitrary commands by sending a POST request to a specific endpoint. This could impact an organization's systems and data by allowing unauthorized code execution. The CISA has listed this vulnerability as actively exploited.
- Find exposed assets.
- Reduce exposure or isolate risk.
- Apply vendor fix, verify, and monitor.
