GHSA-g8rh-fjm6-h2h9

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GHSA-g8rh-fjm6-h2h9

Summary: LF Edge eKuiper: Self-XSS in External Service Creation

Details: ### Summary A Cross-Site Scripting (XSS) vulnerability in external service creation allows an authenticated attacker to inject HTML/script payloads into external service names, which may execute in a user's browser when rendered by administrative web interfaces. ### Details Prior to v2.4.0, external service registration endpoints did not strictly enforce alphanumeric character restrictions on service names. An operator or attacker with API access could register a service using a crafted name containing HTML elements (such as `<iframe src="...">`). If an administrative web UI rendered the unescaped service name, arbitrary script execution could occur in the context of the user's browser session. ### PoC 1. Create an external service JSON definition with a filename containing an XSS payload, e.g. `<iframe src="javascript:alert`1337`">.json` inside a ZIP archive. 2. In external service creation, upload the ZIP and provide the matching service name: `<iframe src="javascript:alert`1337`">`. 3. Upon service registration, the unescaped name executes when rendered in the UI context. ### Impact Self-XSS / Stored XSS leading to potential session token leakage or unauthorized actions in the context of the affected user's browser session. ### Remediation & Patches - **Upgrade to eKuiper >= 2.4.0**: Strict alphanumeric identifier validation (`validate.ValidateID`) is now enforced on all external service creation and update endpoints, rejecting invalid characters. ### Workarounds - Protect eKuiper management endpoints (`POST /services`) with authentication and network-level firewalls. ### Credits - Reported by Alexey Kosmachev, Bi.Zone (@TheMostKnown)

References: https://github.com/lf-edge/ekuiper/security/advisories/GHSA-g8rh-fjm6-h2h9, https://github.com/lf-edge/ekuiper, https://github.com/lf-edge/ekuiper/releases/tag/v2.4.0