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Improper Validation of Array Index Affecting github.com/greenpau/caddy-security package, versions *

0.0
medium

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.05% (15th percentile)

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  • Snyk ID SNYK-GOLANG-GITHUBCOMGREENPAUCADDYSECURITY-5961078
  • published 16 Feb 2024
  • disclosed 18 Sep 2023
  • credit Maciej Domanski, Travis Peters, David Pokora
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Introduced: 18 Sep 2023

CVE-2024-21493 Open this link in a new tab
CWE-129 Open this link in a new tab
First added by Snyk

How to fix?

There is no fixed version for github.com/greenpau/caddy-security.

Overview

github.com/greenpau/caddy-security is a Security App and Plugin for Caddy v2.

Affected versions of this package are vulnerable to Improper Validation of Array Index when parsing a Caddyfile. Multiple parsing functions in the affected library do not validate whether their input values are nil before attempting to access elements, which can lead to a panic (index out of range). Panics during the parsing of a configuration file may introduce ambiguity and vulnerabilities, hindering the correct interpretation and configuration of the web server.

PoC 

func TestCrashCredentialsUsername(t *testing.T) {
    file := caddyfile.NewTestDispenser(string("0 { credentials 0 { username"))
    parseCaddyfile(file, nil)
}

func TestCrashCredentialsDomain(t *testing.T) {
    file := caddyfile.NewTestDispenser(string("0 { credentials 0 { domain"))
    parseCaddyfile(file, nil)
}

func TestCrashSSOProvider(t *testing.T) {
    file := caddyfile.NewTestDispenser(string("00 {  sso provider 0 {  entity_id"))
    parseCaddyfile(file, nil)
}

func TestCrashParseCaddyfileMessaging(t *testing.T) {
    file := caddyfile.NewTestDispenser(string("0 { messaging email provider 0 { address"))
    parseCaddyfile(file, nil)
}

References