CVE-2022-21698: Github.com/prometheus/client golang Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-cg3q-j54f-5p7p
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CVSS 7.5
CWE-400 CWE-772
Published
Advisory Summary

CVE-2022-21698 is a HIGH (CVSS 7.5) remote code execution vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Github.com/prometheus/client golang libraries in the Go ecosystem. The issue involves uncontrolled resource consumption in promhttp. Remediation is available by upgrading affected packages to version 1.11.1.

CVE-2022-21698 at a Glance

CVE Identifier CVE-2022-21698
GHSA Identifier GHSA-cg3q-j54f-5p7p
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Github.com/prometheus/client golang
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2022-21698

To remediate this vulnerability, upgrade all affected Github.com/prometheus/client golang dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/prometheus/client_golang fixed: 1.11.1 
Upgrade github.com/prometheus/client_golang to 1.11.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/prometheus/client_golang

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-21698, inspect your project dependencies for Github.com/prometheus/client golang:

inspect dependencies for github.com/prometheus/client_golang

Analyze the terminal output to locate any version of Github.com/prometheus/client golang in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Github.com/prometheus/client golang, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

This is the Go client library for Prometheus. It has two separate parts, one for instrumenting application code, and one for creating clients that talk to the Prometheus HTTP API. 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. ### Impact HTTP server susceptible to a Denial of Service through unbounded cardinality, and potential memory exhaustion, when handling requests with non-standard HTTP methods. ### Affected Configuration In order to be affected, an instrumented software must * Use any of `promhttp.InstrumentHandler*` middleware except `RequestsInFlight`. * Do not filter any specific methods (e.g GET) before middleware. * Pass metric with `method` label name to our middleware. * Not have any firewall/LB/proxy that filters away requests with unknown `method`. ### Patches * https://github.com/prometheus/client_golang/pull/962 * https://github.com/prometheus/client_golang/pull/987 ### Workarounds If you cannot upgrade to [v1.11.1 or above](https://github.com/prometheus/client_golang/releases/tag/v1.11.1), in order to stop being affected you can: * Remove `method` label name from counter/gauge you use in the InstrumentHandler. * Turn off affected promhttp handlers. * Add custom middleware before promhttp handler that will sanitize the request method given by Go http.Request. * Use a reverse proxy or web application firewall, configured to only allow a limited set of methods. ### For more information If you have any questions or comments about this advisory: * Open an issue in https://github.com/prometheus/client_golang * Email us at `prometheus-team@googlegroups.com`

CVE-2022-21698 Affected Github.com/prometheus/client golang Versions

1 component(s)
Fixed Versions:
1.11.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/prometheus/client_golang
golang/github.com/prometheus/client_golang
Go
< 1.11.1
1.11.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/prometheus/client_golang/security/advisories/GHSA-cg3q-j54f-5p7p
NVD — CVE-2022-21698 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-21698
Github.com/prometheus/client golang Source Repository REPOSITORY
https://github.com/prometheus/client_golang/pull/962
Github.com/prometheus/client golang Source Repository REPOSITORY
https://github.com/prometheus/client_golang/pull/987
pkg.go.dev/vuln/go-2022-0322 WEB
https://pkg.go.dev/vuln/GO-2022-0322
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZY2SLWOQR4ZURQ7UBRZ7JIX6H6F5JHJR
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKORFJTRRDJCWBTJPISKKCVMMMJBIRLG
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lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3L6GDN5S5QZSCFKWD3GKL2RDZQ6B4UWA
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/36GUEPA5TPSC57DZTPYPBL6T7UPQ2FRH
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lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2IK53GWZ475OQ6ENABKMJMTOBZG6LXUR
Github.com/prometheus/client golang Release RELEASE
https://github.com/prometheus/client_golang/releases/tag/v1.11.1
Github.com/prometheus/client golang Source Repository REPOSITORY
https://github.com/prometheus/client_golang

Frequently Asked Questions

What is CVE-2022-21698?
CVE-2022-21698 is a security vulnerability in Github.com/prometheus/client golang involving Uncontrolled Resource Consumption in promhttp under CWE-400: Uncontrolled Resource Consumption.
Which Github.com/prometheus/client golang versions are affected?
Affected versions include releases prior to 1.11.1 across affected packages: github.com/prometheus/client_golang.
What version fixes CVE-2022-21698?
Upgrading to 1.11.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/prometheus/client_golang affected?
Yes, github.com/prometheus/client_golang is affected in releases prior to 1.11.1. Upgrade your dependency to 1.11.1 or later.
What is the CVSS score of CVE-2022-21698?
CVE-2022-21698 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-21698?
CVE-2022-21698 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Go dependencies for CVE-2022-21698?
Run the dependency tree command: 'inspect dependencies for github.com/prometheus/client_golang'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-cg3q-j54f-5p7p",
  "modified" : "2022-02-25T15:41:10Z",
  "published" : "2022-02-16T22:26:35Z",
  "aliases" : [ "CVE-2022-21698" ],
  "summary" : "Uncontrolled Resource Consumption in promhttp",
  "details" : "This is the Go client library for Prometheus. It has two separate parts, one for instrumenting application code, and one for creating clients that talk to the Prometheus HTTP API. 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.\n\n### Impact\n\nHTTP server susceptible to a Denial of Service through unbounded cardinality, and potential memory exhaustion, when handling requests with non-standard HTTP methods.\n\n###  Affected Configuration\n\nIn order to be affected, an instrumented software must\n\n* Use any of `promhttp.InstrumentHandler*` middleware except `RequestsInFlight`.\n* Do not filter any specific methods (e.g GET) before middleware.\n* Pass metric with `method` label name to our middleware.\n* Not have any firewall/LB/proxy that filters away requests with unknown `method`.\n\n### Patches\n\n* https://github.com/prometheus/client_golang/pull/962\n* https://github.com/prometheus/client_golang/pull/987\n\n### Workarounds\n\nIf you cannot upgrade to [v1.11.1 or above](https://github.com/prometheus/client_golang/releases/tag/v1.11.1), in order to stop being affected you can:\n\n* Remove `method` label name from counter/gauge you use in the InstrumentHandler.\n* Turn off affected promhttp handlers.\n* Add custom middleware before promhttp handler that will sanitize the request method given by Go http.Request.\n* Use a reverse proxy or web application firewall, configured to only allow a limited set of methods.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue in https://github.com/prometheus/client_golang\n* Email us at `prometheus-team@googlegroups.com`\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/prometheus/client_golang"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.11.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/prometheus/client_golang/security/advisories/GHSA-cg3q-j54f-5p7p"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-21698"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/prometheus/client_golang/pull/962"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/prometheus/client_golang/pull/987"
  }, {
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    "url" : "https://pkg.go.dev/vuln/GO-2022-0322"
  }, {
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    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZY2SLWOQR4ZURQ7UBRZ7JIX6H6F5JHJR"
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  }, {
    "type" : "WEB",
    "url" : "https://github.com/prometheus/client_golang/releases/tag/v1.11.1"
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  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-772" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-02-16T22:26:35Z",
    "nvd_published_at" : "2022-02-15T16:15:00Z"
  }
}