CVE-2022-21698 Information

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://github.com/prometheus/client_golang/pull/962 https://github.com/prometheus/client_golang/releases/tag/v1.11.1 https://github.com/prometheus/client_golang/security/advisories/GHSA-cg3q-j54f-5p7p https://github.com/prometheus/client_golang/pull/987 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FY3N7H6VSDZM37B4SKM2PFFCUWU7QYWN/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKORFJTRRDJCWBTJPISKKCVMMMJBIRLG/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SASRKYHT5ZFSVMJUQUG3UAEQRJYGJKAR/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AK7CJBCGERCRXYUR2EWDSSDVAQMTAZGX/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KBMVIQFKQDSSTHVVJWJ4QH6TW3JVB7XZ/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7V7I72LSQ3IET3QJR6QPAVGJZ4CBDLN5/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HLAQRRGNSO5MYCPAXGPH2OCSHOGHSQMQ/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2PFW6Q2LXXWTFRTMTRN4ZGADFRQPKJ3D/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J5WPM42UR6XIBQNQPNQHM32X7S4LJTRX/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4KDETHL5XCT6RZN2BBNOCEXRZ2W3SFU3/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36GUEPA5TPSC57DZTPYPBL6T7UPQ2FRH/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DLUJZV3HBP56ADXU6QH2V7RNYUPMVBXQ/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5