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CVE-2017-11424

Published: 24 August 2017

In PyJWT 1.5.0 and below the `invalid_strings` check in `HMACAlgorithm.prepare_key` does not account for all PEM encoded public keys. Specifically, the PKCS1 PEM encoded format would be allowed because it is prefaced with the string `-----BEGIN RSA PUBLIC KEY-----` which is not accounted for. This enables symmetric/asymmetric key confusion attacks against users using the PKCS1 PEM encoded public keys, which would allow an attacker to craft JWTs from scratch.

Notes

AuthorNote
tyhicks
The added deprecation warnings present in the fix probably aren't
needed in security backports

Priority

Medium

CVSS 3 base score: 7.5

Status

Package Release Status
pyjwt
Launchpad, Ubuntu, Debian
upstream Needed

precise Does not exist

trusty Does not exist

xenial
Released (1.3.0-1ubuntu0.1)
zesty
Released (1.4.2-1ubuntu0.1)
Patches:
upstream: https://github.com/jpadilla/pyjwt/pull/277