{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/products/typespec-spector--0.1.0-alpha.27/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["TypeSpec Spector (\u003c 0.1.0-alpha.27)"],"_cs_severities":["medium"],"_cs_tags":["denial-of-service","web-application-security","typespec"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eThe \u003ccode\u003e@typespec/spector\u003c/code\u003e mock server, a component of the TypeSpec ecosystem, contains a critical security flaw (CWE-306) allowing for unauthenticated remote denial-of-service. An Express-based admin route registered at \u003ccode\u003ePOST /.admin/stop\u003c/code\u003e is exposed without any authentication, authorization tokens, Origin header verification, or IP-based source restrictions. By default, the server binds to \u003ccode\u003e0.0.0.0\u003c/code\u003e, rendering the endpoint accessible to any client with network connectivity to the service port, rather than restricting it to localhost.\u003c/p\u003e\n\u003cp\u003eWhen triggered, the handler logs an exit signal and executes \u003ccode\u003eprocess.exit(0)\u003c/code\u003e, effectively shutting down the mock server process. This vulnerability is particularly impactful for CI/CD pipelines, shared cloud developer environments, and containerized deployments where the service port is reachable from external or less-trusted network segments. No credentials are required to successfully invoke the shutdown signal.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe target server is initiated using \u003ccode\u003etsp-spector serve\u003c/code\u003e, causing it to bind to \u003ccode\u003e0.0.0.0:3000\u003c/code\u003e by default.\u003c/li\u003e\n\u003cli\u003eThe application registers the \u003ccode\u003einternalRouter\u003c/code\u003e which includes the unauthenticated administrative route at \u003ccode\u003e/.admin/stop\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eAn attacker identifies the mock server port (default 3000) through network scanning or organizational knowledge.\u003c/li\u003e\n\u003cli\u003eThe attacker sends a crafted \u003ccode\u003ePOST\u003c/code\u003e request to \u003ccode\u003ehttp://\u0026lt;target-host\u0026gt;:3000/.admin/stop\u003c/code\u003e with no headers or credentials.\u003c/li\u003e\n\u003cli\u003eThe application’s Express router accepts the unauthenticated request as a legitimate admin command.\u003c/li\u003e\n\u003cli\u003eThe backend handler executes \u003ccode\u003eprocess.exit(0)\u003c/code\u003e, terminating the Node.js process.\u003c/li\u003e\n\u003cli\u003eThe mock server ceases all operations, resulting in a successful denial-of-service against the testing environment.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation results in an immediate, unauthenticated denial-of-service. Because the service is used in CI/CD and developer testing pipelines, a successful attack can halt integration testing, break automated deployment flows, and cause downstream disruption in development workflows. Given the lack of default access controls and the broad network binding, this vulnerability poses a high risk to any organization running Spector in shared network environments.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritize the immediate upgrade of all \u003ccode\u003e@typespec/spector\u003c/code\u003e instances to version 0.1.0-alpha.27 or later, which incorporates mandatory authentication or restricted access patterns. In environments where an immediate upgrade is not possible, implement firewall rules to restrict access to port 3000 solely to local loopback addresses or trusted management IP ranges. Monitor web server logs for HTTP POST requests to the \u003ccode\u003e/.admin/stop\u003c/code\u003e endpoint and alert on unauthorized access attempts.\u003c/p\u003e\n\u003ch2 id=\"impact-1\"\u003eImpact\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCWE-306: Missing Authentication for Critical Function\u003c/li\u003e\n\u003cli\u003eCVSS 7.5 (High)\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-09-05T00:07:40Z","date_published":"2026-09-05T00:07:40Z","id":"https://feed.craftedsignal.io/briefs/2026-09-spector-unauth-shutdown/","summary":"The TypeSpec Spector mock server lacks authentication on its administrative shutdown endpoint, allowing any network-reachable attacker to terminate the server process via a single POST request.","title":"Unauthenticated Remote Shutdown in TypeSpec Spector","url":"https://feed.craftedsignal.io/briefs/2026-09-spector-unauth-shutdown/"}],"language":"en","title":"CraftedSignal Threat Feed - TypeSpec Spector (\u003c 0.1.0-Alpha.27)","version":"https://jsonfeed.org/version/1.1"}