CVE-2021-3912: Github.com/cloudflare/cfrpki OctoRPKI Crashes When Processing GZIP Vulnerability

MODERATE
Advisory Identifier: GHSA-g9wh-3vrx-r7hg
Share
CVSS 4.2
CWE-400 CWE-770
Published
Advisory Summary

CVE-2021-3912 is a MODERATE (CVSS 4.2) octorpki crashes when processing gzip vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Github.com/cloudflare/cfrpki libraries in the Go ecosystem. The issue involves octorpki crashes when processing gzip bomb returned via malicious repository. Remediation is available by upgrading affected packages to version 1.4.0.

CVE-2021-3912 at a Glance

CVE Identifier CVE-2021-3912
GHSA Identifier GHSA-g9wh-3vrx-r7hg
Severity MODERATE
CVSS v3.1 Base Score 4.2
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Github.com/cloudflare/cfrpki
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 4.2

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

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

How to Fix CVE-2021-3912

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-2021-3912, 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 tries to load the entire contents of a repository in memory, and in the case of a GZIP bomb, unzip it in memory, making it possible to create a repository that makes OctoRPKI run out of memory (and thus crash). ## Patches ## For more information If you have any questions or comments about this advisory email us at security@cloudflare.com

CVE-2021-3912 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-g9wh-3vrx-r7hg
NVD — CVE-2021-3912 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3912
Security Fix Commit FIX COMMIT
https://github.com/cloudflare/cfrpki/commit/648658b1b176a747b52645989cfddc73a81eacad
pkg.go.dev/vuln/go-2022-0253 WEB
https://pkg.go.dev/vuln/GO-2022-0253
Github.com/cloudflare/cfrpki Security Information SECURITY
https://www.debian.org/security/2022/dsa-5041
github.com/cloudflar... PACKAGE
github.com/cloudflare/cfrpki

Frequently Asked Questions

What is CVE-2021-3912?
CVE-2021-3912 is a security vulnerability in Github.com/cloudflare/cfrpki involving OctoRPKI crashes when processing GZIP bomb returned via malicious repository 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-2021-3912?
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-2021-3912?
CVE-2021-3912 has a CVSS v3.1 base score of 4.2 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-3912?
CVE-2021-3912 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-2021-3912?
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-g9wh-3vrx-r7hg",
  "modified" : "2021-11-10T18:19:37Z",
  "published" : "2021-11-10T20:39:23Z",
  "aliases" : [ "CVE-2021-3912" ],
  "summary" : "OctoRPKI crashes when processing GZIP bomb returned via malicious repository",
  "details" : "OctoRPKI tries to load the entire contents of a repository in memory, and in the case of a GZIP bomb, unzip it in memory, making it possible to create a repository that makes OctoRPKI run out of memory (and thus crash). \n\n## Patches\n\n## For more information\nIf you have any questions or comments about this advisory email us at security@cloudflare.com\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/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-g9wh-3vrx-r7hg"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3912"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/cloudflare/cfrpki/commit/648658b1b176a747b52645989cfddc73a81eacad"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2022-0253"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2022/dsa-5041"
  }, {
    "type" : "PACKAGE",
    "url" : "github.com/cloudflare/cfrpki"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-10T18:19:37Z",
    "nvd_published_at" : "2021-11-11T22:15:00Z"
  }
}