GHSA-c66c-vq6w-fvh5

## Summary `managementServer.CreateSchematic` (`internal/backend/grpc/schematics.go`) passes the caller-controlled `TalosVersion` field directly to `imageFactoryClient.OverlaysVersions`, which embeds it verbatim into a `fmt.Sprintf("/version/%s/overlays/official", talosVersion)` path template. `url.URL.JoinPath` resolves any `../` sequences in that path, allowing an authenticated Operator to rewrite the URL path and force Omni to issue HTTP GET requests to unintended paths on the configured image-factory server. Error body content from those unintended endpoints is returned to the caller. ## Severity - **Attack Vector:** Network: exploited via the gRPC `CreateSchematic` API endpoint. - **Attack Complexity:** Low: once the attacker holds an Operator credential and has identified a media ID with an overlay, exploitation is a single API call. - **Privileges Required:** High: `role.Operator` is required, which has administrative capabilities on Omni. - **User Interaction:** None. - **Scope:** Unchanged: the traversal is constrained to the configured image-factory host; the attacker cannot redirect Omni to an arbitrary external server. - **Confidentiality Impact:** Low: error body content from unintended image-factory endpoints is reflected back to the operator, potentially leaking server-internal information. - **Integrity Impact:** None: only HTTP GET requests are issued; no write operations are performed. - **Availability Impact:** None. ## Impact - **Same-host path traversal**: An authenticated Operator can force Omni to issue GET requests to arbitrary URL paths on the configured image-factory server, bypassing the intended versioned overlay API structure. - **Error-body disclosure**: HTTP error responses from unintended image-factory endpoints are reflected back to the operator, potentially leaking server-internal diagnostics or sensitive path content. - **Internal network probing**: In deployments using a private image-factory instance on an internal network, the attacker can probe endpoint existence and partial responses through error-text differences. - **Depth control**: By varying the number of `../` prefixes in `talosVersion`, the attacker can reach any path hierarchy on the image-factory host. ## Credit This vulnerability was discovered and reported by [bugbunny.ai](https://bugbunny.ai).