x/vulndb: potential Go vuln in github.com/prometheus/client_golang: CVE-2022-21698

[jba]

In CVE-2022-21698, the reference URL github.com/prometheus/client_golang (and possibly others) refers to something in Go.

• PR: promhttp: Check validity of method and code label values (#962) prometheus/client_golang#987

module: github.com/prometheus/client_golang
package: client_golang
description: |
    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.
cves:
  - CVE-2022-21698
links:
    pr: https://github.com/prometheus/client_golang/pull/987
    context:
      - https://github.com/prometheus/client_golang/releases/tag/v1.11.1
      - https://github.com/prometheus/client_golang/security/advisories/GHSA-cg3q-j54f-5p7p

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