Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Prometheus | Client Golang | < 1.11.1 |
| Fedoraproject | Fedora | 34 |
| Fedoraproject | Extra Packages For Enterprise Linux | 7.0 |
| Rdo Project | Rdo | - |
Related Weaknesses (CWE)
References
- https://github.com/prometheus/client_golang/pull/962PatchThird Party Advisory
- https://github.com/prometheus/client_golang/pull/987PatchThird Party Advisory
- https://github.com/prometheus/client_golang/releases/tag/v1.11.1Release NotesThird Party Advisory
- https://github.com/prometheus/client_golang/security/advisories/GHSA-cg3q-j54f-5Issue TrackingThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2022-21698?
CVE-2022-21698 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ve...
How severe is CVE-2022-21698?
CVE-2022-21698 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-21698?
Check the references section above for vendor advisories and patch information. Affected products include: Prometheus Client Golang, Fedoraproject Fedora, Fedoraproject Extra Packages For Enterprise Linux, Rdo Project Rdo.