T09 · Insecure Skill Coding Practices
- Location
snippets/common-configs.md:37- Finding
Gateway Configuration Binds to All Network Interfaces
- Content
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Vulnerability Details
File Location:
snippets/common-configs.md, lines 37–44
Vulnerability Type: Insecure network exposure
Risk Level: MediumVulnerable Code
markdown ## Gateway Configuration ```json { "gateway": { "host": "0.0.0.0", "port": 8080 } }text ### Technical Analysis The ready-to-use configuration binds the gateway to `0.0.0.0`, causing it to listen on every available network interface rather than only the local loopback interface. The example does not include authentication, TLS, firewall restrictions, network allowlisting, or a warning about the resulting exposure. A user who copies this configuration may unintentionally make the gateway reachable from a local network, a container or cloud network, or the public Internet, depending on routing and firewall rules. Whether the service can ultimately be compromised depends on the gateway's separately configured access controls and exposed functionality. ### Attack Path 1. A user copies the documented gateway configuration. 2. The gateway starts listening on TCP port 8080 across all network interfaces. 3. Existing host, container, or cloud firewall rules permit an untrusted client to reach that port. 4. The client discovers and connects to the gateway. 5. The client probes or abuses any gateway functions that are not protected by separate authentication and authorization controls. ### Impact Assessment This configuration may expand gateway access from local processes to remote network clients. An attacker could obtain access to whatever gateway endpoints and operations are reachable without separate controls. The exact privileges depend on the gateway's implementation and runtime authorization configuration; the audited files do not establish that unrestricted administrative access is available.- Remediation
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Remediation Suggestions
- Change the default bind address to
127.0.0.1so the gateway is local-only:
json { "gateway": { "host": "127.0.0.1", "port": 8080 } }- Require an explicit, documented opt-in before binding to
0.0.0.0. - Add a prominent warning explaining that
0.0.0.0exposes the service through all reachable interfaces. - Require strong authentication and authorization for every gateway operation.
- Protect remote traffic with TLS, preferably through a hardened reverse proxy.
- Restrict inbound traffic with host and cloud firewalls or network allowlists.
- Document container port-publishing and cloud security-group risks.
- Add automated checks that warn when a non-loopback binding is used without appropriate access controls.
- Change the default bind address to
