jpadilla pyjwt 2.10.0 JSON Web Token comparison

Summaryinfo

A vulnerability classified as problematic has been found in jpadilla pyjwt 2.10.0. Affected is an unknown function of the component JSON Web Token Handler. The manipulation leads to comparison. This vulnerability is traded as CVE-2024-53861. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in jpadilla pyjwt 2.10.0 and classified as problematic. This issue affects some unknown processing of the component JSON Web Token Handler. The manipulation with an unknown input leads to a comparison vulnerability. Using CWE to declare the problem leads to CWE-697. The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses. Impacted is availability. The summary by CVE is:

pyjwt is a JSON Web Token implementation in Python. An incorrect string comparison is run for `iss` checking, resulting in `"acb"` being accepted for `"_abc_"`. This is a bug introduced in version 2.10.0: checking the "iss" claim changed from `isinstance(issuer, list)` to `isinstance(issuer, Sequence)`. Since str is a Sequnce, but not a list, `in` is also used for string comparison. This results in `if "abc" not in "__abcd__":` being checked instead of `if "abc" != "__abc__":`. Signature checks are still present so real world impact is likely limited to denial of service scenarios. This issue has been patched in version 2.10.1. All users are advised to upgrade. There are no known workarounds for this vulnerability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2024-53861 since 11/22/2024. The exploitation is known to be difficult. The attack may be initiated remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.10.1 eliminates this vulnerability. Applying the patch 1570e708672aa9036bc772476beae8bfa48f4131 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• jpadilla

Name

• pyjwt

Version

• 2.10.0

License

• open-source

Website

• Product: https://github.com/jpadilla/pyjwt/

CPE 2.3info

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• 🔍

CPE 2.2info

• 🔍
• 🔍

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