### Summary When Steeltoe management endpoints are configured to listen on an alternate port (`Management:Endpoints:Port` is configured), the middleware responsible for restricting access to the endpoints uses the `Host` HTTP header rather than the actual network socket port. ### Impact An unauthenticated remote attacker can reach every actuator endpoint using a specially crafted HTTP request. ### Affected configuration - The application's public port is accessible over from the network. - `Management:Endpoints:Port` is configured to a value different from the application's main listener port. - The request scheme matches `Management:Endpoints:SslEnabled`. For example, `http` when `SslEnabled` is `false` (the default), or `https` when `SslEnabled` is `true`. ### Mitigations If an immediate upgrade to a patched version is not possible: - Add explicit ASP.NET Core authorization (`RequireAuthorization`) to all sensitive actuator endpoints as a defense-in-depth measure independent of port isolation. - Configure the reverse proxy or load balancer to enforce the `Host` header value and prevent clients from setting an arbitrary port.
### Summary When Steeltoe management endpoints are configured to listen on an alternate port (`Management:Endpoints:Port` is configured), the middleware responsible for restricting access to the endpoints uses the `Host` HTTP header rather than the actual network socket port. ### Impact An unauthenticated remote attacker can reach every actuator endpoint using a specially crafted HTTP request. ### Affected configuration - The application's public port is accessible over from the network. - `Management:Endpoints:Port` is configured to a value different from the application's main listener port. - The request scheme matches `Management:Endpoints:SslEnabled`. For example, `http` when `SslEnabled` is `false` (the default), or `https` when `SslEnabled` is `true`. ### Mitigations If an immediate upgrade to a patched version is not possible: - Add explicit ASP.NET Core authorization (`RequireAuthorization`) to all sensitive actuator endpoints as a defense-in-depth measure independent of port isolation. - Configure the reverse proxy or load balancer to enforce the `Host` header value and prevent clients from setting an arbitrary port.
Update Steeltoe.Management.Endpoint to 4.2.0; Steeltoe.Management.EndpointCore to 3.4.0 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanSteeltoe vulnerable to management-port isolation bypass via spoofed Host header affects Steeltoe.Management.Endpoint (nuget), Steeltoe.Management.EndpointCore (nuget). Severity is high. ### Summary When Steeltoe management endpoints are configured to listen on an alternate port (`Management:Endpoints:Port` is configured), the middleware responsible for restricting access to the endpoints uses the `Host` HTTP header rather than the actual network socket port. ### Impact An unauthenticated remote attacker can reach every actuator endpoint using a specially crafted HTTP request. ### Affected configuration - The application's public port is accessible over from the network. - `Management:Endpoints:Port` is configured to a value different from the application's main listener port. - The request scheme matches `Management:Endpoints:SslEnabled`. For example, `http` when `SslEnabled` is `false` (the default), or `https` when `SslEnabled` is `true`. ### Mitigations If an immediate upgrade to a patched version is not possible: - Add explicit ASP.NET Core authorization (`RequireAuthorization`) to all sensitive actuator endpoints as a defense-in-depth measure independent of port isolation. - Configure the reverse proxy or load balancer to enforce the `Host` header value and prevent clients from setting an arbitrary port.
AI coding agents often install or upgrade packages automatically in nuget. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| Steeltoe.Management.Endpointnuget | <=4.1.0 | 4.2.0 |
| Steeltoe.Management.EndpointCorenuget | >=3.2.2,<=3.3.0 | 3.4.0 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardUpdate Steeltoe.Management.Endpoint to 4.2.0; Steeltoe.Management.EndpointCore to 3.4.0 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanSteeltoe vulnerable to management-port isolation bypass via spoofed Host header affects Steeltoe.Management.Endpoint (nuget), Steeltoe.Management.EndpointCore (nuget). Severity is high. ### Summary When Steeltoe management endpoints are configured to listen on an alternate port (`Management:Endpoints:Port` is configured), the middleware responsible for restricting access to the endpoints uses the `Host` HTTP header rather than the actual network socket port. ### Impact An unauthenticated remote attacker can reach every actuator endpoint using a specially crafted HTTP request. ### Affected configuration - The application's public port is accessible over from the network. - `Management:Endpoints:Port` is configured to a value different from the application's main listener port. - The request scheme matches `Management:Endpoints:SslEnabled`. For example, `http` when `SslEnabled` is `false` (the default), or `https` when `SslEnabled` is `true`. ### Mitigations If an immediate upgrade to a patched version is not possible: - Add explicit ASP.NET Core authorization (`RequireAuthorization`) to all sensitive actuator endpoints as a defense-in-depth measure independent of port isolation. - Configure the reverse proxy or load balancer to enforce the `Host` header value and prevent clients from setting an arbitrary port.
AI coding agents often install or upgrade packages automatically in nuget. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| Steeltoe.Management.Endpointnuget | <=4.1.0 | 4.2.0 |
| Steeltoe.Management.EndpointCorenuget | >=3.2.2,<=3.3.0 | 3.4.0 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard