CVE-2021-3908: Github.com/cloudflare/cfrpki Infinite Certificate Chain Depth Results Vulnerability

MODERATE
Advisory Identifier: GHSA-g5gj-9ggf-9vmq
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CVSS 5.9
CWE-400 CWE-835
Published
Advisory Summary

CVE-2021-3908 is a MODERATE (CVSS 5.9) infinite certificate chain depth results vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Github.com/cloudflare/cfrpki libraries in the Go ecosystem. The issue involves infinite certificate chain depth results in octorpki running forever. Remediation is available by upgrading affected packages to version 1.4.0.

CVE-2021-3908 at a Glance

CVE Identifier CVE-2021-3908
GHSA Identifier GHSA-g5gj-9ggf-9vmq
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Github.com/cloudflare/cfrpki
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.9

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2021-3908

To remediate this vulnerability, upgrade all affected Github.com/cloudflare/cfrpki 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/cloudflare/cfrpki fixed: 1.4.0 
Upgrade github.com/cloudflare/cfrpki to 1.4.0
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/cloudflare/cfrpki

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-3908, inspect your project dependencies for Github.com/cloudflare/cfrpki:

inspect dependencies for github.com/cloudflare/cfrpki

Analyze the terminal output to locate any version of Github.com/cloudflare/cfrpki in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.0), 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/cloudflare/cfrpki, 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

OctoRPKI (github.com/cloudflare/cfrpki/cmd/octorpki) does not limit the depth of a certificate chain, allowing for a CA to create children in an ad-hoc fashion, thereby making tree traversal never end. ### For more information If you have any questions or comments about this advisory email us at security@cloudflare.com

CVE-2021-3908 Affected Github.com/cloudflare/cfrpki Versions

1 component(s)
Fixed Versions:
1.4.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/cloudflare/cfrpki
golang/github.com/cloudflare/cfrpki
Go
< 1.4.0
1.4.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/cloudflare/cfrpki/security/advisories/GHSA-g5gj-9ggf-9vmq
NVD — CVE-2021-3908 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3908
Github.com/cloudflare/cfrpki Source Repository REPOSITORY
https://github.com/cloudflare/cfrpki
Github.com/cloudflare/cfrpki Release RELEASE
https://github.com/cloudflare/cfrpki/releases/tag/v1.4.0
Github.com/cloudflare/cfrpki Security Information SECURITY
https://www.debian.org/security/2022/dsa-5041

Frequently Asked Questions

What is CVE-2021-3908?
CVE-2021-3908 is a security vulnerability in Github.com/cloudflare/cfrpki involving Infinite certificate chain depth results in OctoRPKI running forever under CWE-400: Uncontrolled Resource Consumption.
Which Github.com/cloudflare/cfrpki versions are affected?
Affected versions include releases prior to 1.4.0 across affected packages: github.com/cloudflare/cfrpki.
What version fixes CVE-2021-3908?
Upgrading to 1.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/cloudflare/cfrpki affected?
Yes, github.com/cloudflare/cfrpki is affected in releases prior to 1.4.0. Upgrade your dependency to 1.4.0 or later.
What is the CVSS score of CVE-2021-3908?
CVE-2021-3908 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-3908?
CVE-2021-3908 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-2021-3908?
Run the dependency tree command: 'inspect dependencies for github.com/cloudflare/cfrpki'. 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-g5gj-9ggf-9vmq",
  "modified" : "2023-10-02T15:58:02Z",
  "published" : "2021-11-10T20:38:53Z",
  "aliases" : [ "CVE-2021-3908" ],
  "summary" : "Infinite certificate chain depth results in OctoRPKI running forever",
  "details" : "OctoRPKI (github.com/cloudflare/cfrpki/cmd/octorpki) does not limit the depth of a certificate chain, allowing for a CA to create children in an ad-hoc fashion, thereby making tree traversal never end.\n\n### For more information\nIf you have any questions or comments about this advisory email us at security@cloudflare.com \n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/cloudflare/cfrpki"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/cfrpki/security/advisories/GHSA-g5gj-9ggf-9vmq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3908"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cloudflare/cfrpki"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/cfrpki/releases/tag/v1.4.0"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2022/dsa-5041"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-835" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-10T18:18:55Z",
    "nvd_published_at" : "2021-11-11T22:15:00Z"
  }
}