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Ubuntu Security Notice USN-3407-1
August 30, 2017
pyjwt vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 17.04
– Ubuntu 16.04 LTS
Summary:
PyJWT could be made to crash if it received specially crafted
input.
Software Description:
– pyjwt: Python implementation of JSON Web Token
Details:
It was discovered that a vulnerability in PyJWT doesn’t check
invalid_strings properly for some public keys. A remote attacker
could take advantage of a key confusion to craft JWTs from scratch.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.04:
python-jwt 1.4.2-1ubuntu0.1
python3-jwt 1.4.2-1ubuntu0.1
Ubuntu 16.04 LTS:
python-jwt 1.3.0-1ubuntu0.1
python3-jwt 1.3.0-1ubuntu0.1
In general, a standard system update will make all the necessary
changes.
References:
https://www.ubuntu.com/usn/usn-3407-1
CVE-2017-11424
Package Information:
https://launchpad.net/ubuntu/+source/pyjwt/1.4.2-1ubuntu0.1
https://launchpad.net/ubuntu/+source/pyjwt/1.3.0-1ubuntu0.1
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