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.
References
Link Resource
https://github.com/prometheus/client_golang/pull/962 Patch Third Party Advisory
https://github.com/prometheus/client_golang/pull/987 Patch Third Party Advisory
https://github.com/prometheus/client_golang/releases/tag/v1.11.1 Release Notes Third Party Advisory
https://github.com/prometheus/client_golang/security/advisories/GHSA-cg3q-j54f-5p7p Issue Tracking Third Party Advisory
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History

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cve-icon MITRE Information

Status: PUBLISHED

Assigner: GitHub_M

Published: 2022-02-15T00:00:00

Updated: 2022-11-14T00:00:00

Reserved: 2021-11-16T00:00:00


Link: CVE-2022-21698

JSON object: View

cve-icon NVD Information

Status : Modified

Published: 2022-02-15T16:15:08.527

Modified: 2023-11-07T03:43:41.337


Link: CVE-2022-21698

JSON object: View

cve-icon Redhat Information

No data.