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CVE-2022-29217

Status Candidate

Overview

PyJWT is a Python implementation of RFC 7519. PyJWT supports multiple different JWT signing algorithms. With JWT, an attacker submitting the JWT token can choose the used signing algorithm. The PyJWT library requires that the application chooses what algorithms are supported. The application can specify `jwt.algorithms.get_default_algorithms()` to get support for all algorithms, or specify a single algorithm. The issue is not that big as `algorithms=jwt.algorithms.get_default_algorithms()` has to be used. Users should upgrade to v2.4.0 to receive a patch for this issue. As a workaround, always be explicit with the algorithms that are accepted and expected when decoding.

Related Files

Ubuntu Security Notice USN-5526-1
Posted Jul 20, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5526-1 - Aapo Oksman discovered that PyJWT incorrectly handled signatures constructed from SSH public keys. A remote attacker could use this to forge a JWT signature.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2022-29217
SHA-256 | 9f4662cb5a95ee03ce93366d52dac96d27a5c0d5e8a2c08609919e3ec43b155f
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