Vulnerability identifier: #VU97583

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-33531

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
lua-resty-jwt
Other software / Other software solutions

Vendor: cdbattags (Christian Battaglia)

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests. A remote attacker can bypass authentication process and gain unauthorized access to the application by sending a specially crafted JWT with an enc header with the value A256GCM.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

lua-resty-jwt: 0.2.3

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External links
http://insinuator.net/2023/10/lua-resty-jwt-authentication-bypass/
http://github.com/cdbattags/lua-resty-jwt/issues/61
http://github.com/cdbattags/lua-resty-jwt/commit/d1558e2afefe868fea1e7e9a4b04ea94ab678a85

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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.