CVE-2024-37568: authlib Signature Bypass — Exploit

Description

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.)

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness Type (CWE)

CWE-347 CWE-347

CWE-284 CWE-284

Affected Products

Vendor	Product	Versions
authlib	authlib	< 1.3.1

References

Exploits

https://github.com/lepture/authlib/issues/654 https://github.com/lepture/authlib/issues/654

Other References

Frequently Asked Questions

What is CVE-2024-37568? +

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.) It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-37568? +

CVE-2024-37568 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-37568? +

CVE-2024-37568 affects products from authlib, specifically: authlib. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-37568? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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