PKCE downgrade attack in Authentik
CVE-2024-23647

6.5MEDIUM

Key Information:

Vendor

Goauthentik

Status
Authentik
Vendor
CVE Published:
30 January 2024

What is CVE-2024-23647?

A vulnerability affecting the Authentik open-source Identity Provider allows attackers to bypass the protections afforded by the Proof Key for Code Exchange (PKCE). In specific versions prior to 2023.8.7 and 2023.10.7, an attacker could manipulate the authorization request by removing the code_challenge parameter, leading to a failed PKCE verification. This vulnerability poses a risk of Cross-Site Request Forgery (CSRF) and potential code injection attacks, undermining the security provided by PKCE. Users are advised to upgrade to the specified versions to mitigate this risk.

Affected Version(s)

authentik < 2023.8.7 < 2023.8.7

authentik >= 2023.10.0, < 2023.10.7 < 2023.10.0, 2023.10.7

References

https://github.com/goauthentik/authentik/security/advisor...
x_refsource_CONFIRM
https://github.com/goauthentik/authentik/commit/38e04ae12...
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2024-23647 : PKCE downgrade attack in Authentik