client_golang is the instrumentation library for Go applications in Prometheus, and the promhttp package in client_golang provides tooling around HTTP servers and clients. In client_golang prior to version 1.11.1, HTTP server is susceptible to a Denial of Service through unbounded cardinality, and potential memory exhaustion, when handling requests with non-standard HTTP methods. In order to be affected, an instrumented software must use any of `promhttp.InstrumentHandler*` middleware except `RequestsInFlight`; not filter any specific methods (e.g GET) before middleware; pass metric with `method` label name to our middleware; and not have any firewall/LB/proxy that filters away requests with unknown `method`. client_golang version 1.11.1 contains a patch for this issue. Several workarounds are available, including removing the `method` label name from counter/gauge used in the InstrumentHandler; turning off affected promhttp handlers; adding custom middleware before promhttp handler that will sanitize the request method given by Go http.Request; and using a reverse proxy or web application firewall, configured to only allow a limited set of methods.
Metrics
Affected Vendors & Products
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History
Wed, 23 Apr 2025 20:15:00 +0000
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2022-02-15T00:00:00.000Z
Updated: 2025-04-23T19:05:16.614Z
Reserved: 2021-11-16T00:00:00.000Z
Link: CVE-2022-21698

Updated: 2024-08-03T02:53:34.814Z

Status : Modified
Published: 2022-02-15T16:15:08.527
Modified: 2024-11-21T06:45:15.423
Link: CVE-2022-21698
