by Target: U.S. Department of Defense
Summary
An External Service Interaction vulnerability (DNS and HTTP) was identified on the domain www.█████████.
Burp Collaborator Results:
- DNS request received from: ████████
- HTTP request received from: ███
Impact
The External Service Interaction vulnerability occurs when an attacker can induce an application to interact with arbitrary external services such as DNS or HTTP. This can also extend to other services like FTP, SMTP, etc. Potential impacts include:
- DDoS Attacks: Exploiting the interaction to flood external services.
- OS Command Injection: If the application interacts with system commands.
- Denial of Service (DoS): Disrupting the availability of the service.
- Code Manipulation: Inducing unexpected behavior in the application.
System Host(s)
Affected Product(s) and Version(s)
- Specific version information not provided.
Steps to Reproduce
- Implement whitelist checks, boundary-based validation, and proper sanitization.
- Maintain a whitelist at both the network and web front.
- Review source code for functions such as
dns.resolve(),dns.query(),sys_exec(), and similar.
Mitigation Recommendations
- Employ robust validation and sanitization techniques.
- Regularly review and audit source code for vulnerable functions.
- Use network and application-layer whitelists to restrict external service interactions.