CVE-2024-21500: Github.com/greenpau/caddy security Improper Restriction Of Excessive Authentication Vulnerability

MODERATE
Advisory Identifier: GHSA-vfph-hjfv-cpv2
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CVSS 4.8
CWE-307
Published
Advisory Summary

CVE-2024-21500 is a MODERATE (CVSS 4.8) improper restriction of excessive authentication vulnerability (CWE-307: Improper Restriction of Excessive Authentication Attempts) affecting Github.com/greenpau/caddy security libraries in the Go ecosystem. The issue involves improper restriction of excessive authentication attempts in github.com/greenpau/caddy-security. Remediation is available in the latest vendor maintenance releases.

CVE-2024-21500 at a Glance

CVE Identifier CVE-2024-21500
GHSA Identifier GHSA-vfph-hjfv-cpv2
Severity MODERATE
CVSS v3.1 Base Score 4.8
CWE Classification CWE-307: Improper Restriction of Excessive Authentication Attempts
Affected Product Github.com/greenpau/caddy security
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 4.8

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:L/I:L/A:N).

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 Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2024-21500

To remediate this vulnerability, upgrade all affected Github.com/greenpau/caddy security 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/greenpau/caddy-security fixed: Latest secure release 
Upgrade github.com/greenpau/caddy-security to Latest secure release
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/greenpau/caddy-security

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-21500, inspect your project dependencies for Github.com/greenpau/caddy security:

inspect dependencies for github.com/greenpau/caddy-security

Analyze the terminal output to locate any version of Github.com/greenpau/caddy security in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-307: Improper Restriction of Excessive Authentication Attempts, where the product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame. In Github.com/greenpau/caddy security, 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

All versions of the package github.com/greenpau/caddy-security are vulnerable to Improper Restriction of Excessive Authentication Attempts via the two-factor authentication (2FA). Although the application blocks the user after several failed attempts to provide 2FA codes, attackers can bypass this blocking mechanism by automating the application’s full multistep 2FA process.

CVE-2024-21500 Affected Github.com/greenpau/caddy security Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
github.com/greenpau/caddy-security
golang/github.com/greenpau/caddy-security
Go
≤ 1.1.23

References

NVD — CVE-2024-21500 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-21500
Github.com/greenpau/caddy security Source Repository REPOSITORY
https://github.com/greenpau/caddy-security/issues/271
Github.com/greenpau/caddy security Security Information SECURITY
https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy
Github.com/greenpau/caddy security Security Information SECURITY
https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6249864
Github.com/greenpau/caddy security Security Information SECURITY
github.com/greenpau/caddy-security

Frequently Asked Questions

What is CVE-2024-21500?
CVE-2024-21500 is a security vulnerability in Github.com/greenpau/caddy security involving Improper Restriction of Excessive Authentication Attempts in github.com/greenpau/caddy-security under CWE-307: Improper Restriction of Excessive Authentication Attempts.
Which Github.com/greenpau/caddy security versions are affected?
Affected versions include releases prior to current release patches across affected packages: github.com/greenpau/caddy-security.
What version fixes CVE-2024-21500?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/greenpau/caddy-security affected?
Yes, github.com/greenpau/caddy-security is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2024-21500?
CVE-2024-21500 has a CVSS v3.1 base score of 4.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2024-21500?
CVE-2024-21500 is classified under CWE-307: Improper Restriction of Excessive Authentication Attempts (The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.).
How can I check Go dependencies for CVE-2024-21500?
Run the dependency tree command: 'inspect dependencies for github.com/greenpau/caddy-security'. 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-vfph-hjfv-cpv2",
  "modified" : "2025-04-04T02:09:09Z",
  "published" : "2024-02-17T06:30:35Z",
  "aliases" : [ "CVE-2024-21500" ],
  "summary" : "Improper Restriction of Excessive Authentication Attempts in github.com/greenpau/caddy-security",
  "details" : "All versions of the package github.com/greenpau/caddy-security are vulnerable to Improper Restriction of Excessive Authentication Attempts via the two-factor authentication (2FA). Although the application blocks the user after several failed attempts to provide 2FA codes, attackers can bypass this blocking mechanism by automating the application’s full multistep 2FA process.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/greenpau/caddy-security"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.1.23"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-21500"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/greenpau/caddy-security/issues/271"
  }, {
    "type" : "WEB",
    "url" : "https://blog.trailofbits.com/2023/09/18/security-flaws-in-an-sso-plugin-for-caddy"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-6249864"
  }, {
    "type" : "PACKAGE",
    "url" : "github.com/greenpau/caddy-security"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-307" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-02-20T23:48:22Z",
    "nvd_published_at" : "2024-02-17T05:15:10Z"
  }
}