7.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2024-37568

CVE-2024-37568: Authlib has algorithm confusion with asymmetric public keys

lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys. Unless an algorithm is specified in a jwt.decode call, HMAC verification is allowed with any asymmetric public key. (This is similar to CVE-2022-29217 and CVE-2024-33663.)

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2024-37568

CVE-2024-37568:

7.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
authlib	pip	>= 0, < 1.3.1	1.3.1

Technical Details

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Root Cause Analysis

The vulnerability lies in the jwt.decode function, which, if not provided with an explicit algorithm, could allow HMAC verification with an asymmetric public key. The fix is applied in the OctKey.import_key method, which is responsible for importing key materials. The patch adds a check to prevent OctKey (intended for symmetric keys) from importing keys that appear to be asymmetric (e.g., PEM or SSH formatted keys). This directly addresses the algorithm confusion vulnerability by ensuring that symmetric key operations do not inadvertently use asymmetric keys. The PoC in the issue #654 demonstrates how jwt.decode could be exploited, and the fix in OctKey.import_key prevents the key import that enables this exploit path.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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