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CVE-2024-23647— PKCE downgrade attack in Authentik

Quick assessment

Affected
goauthentik authentik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

authentik是authentik开源的一个开源身份提供应用程序。 Authentik 2023.8.7 和 2023.10.7之前版本存在授权问题漏洞，该漏洞源于authentik 的 PKCE中存在安全问题，允许攻击者绕过 PKCE 提供的保护。

CVSS 6.5 · Medium EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2024-23647

Vulnerability Information
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Vulnerability Title
PKCE downgrade attack in Authentik
Source: CVE Program / CVE List V5
Vulnerability Description
Authentik is an open-source Identity Provider. There is a bug in our implementation of PKCE that allows an attacker to circumvent the protection that PKCE offers. PKCE adds the code_challenge parameter to the authorization request and adds the code_verifier parameter to the token request. Prior to 2023.8.7 and 2023.10.7, a downgrade scenario is possible: if the attacker removes the code_challenge parameter from the authorization request, authentik will not do the PKCE check. Because of this bug, an attacker can circumvent the protection PKCE offers, such as CSRF attacks and code injection attacks. Versions 2023.8.7 and 2023.10.7 fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
authentik是authentik开源的一个开源身份提供应用程序。 Authentik 2023.8.7 和 2023.10.7之前版本存在授权问题漏洞，该漏洞源于authentik 的 PKCE中存在安全问题，允许攻击者绕过 PKCE 提供的保护。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
goauthentik authentik < 2023.8.7 -

II. Public POCs for CVE-2024-23647

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III. Intelligence Information for CVE-2024-23647

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Patches & Fixes for CVE-2024-23647 (1)

Vendor Advisories for CVE-2024-23647 (1)

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-287

V. Comments for CVE-2024-23647

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