#VU83471 Security features bypass in authentik - CVE-2023-48228

Vulnerability identifier: #VU83471

Vulnerability risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2023-48228

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
authentik
Other software / Other software solutions

Vendor: Authentik Security Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient PKCE check. A remote attacker can gain access to the target application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

authentik: 2023.8.0 - 2023.10.3

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External links
https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3
https://github.com/goauthentik/authentik/pull/7666
https://github.com/goauthentik/authentik/pull/7668
https://github.com/goauthentik/authentik/pull/7669
https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6
https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5
https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14
https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225
https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4
https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.