PyJWT: Provide Misleading Information -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2175
                            PyJWT vulnerability
                              31 August 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           PyJWT
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-11424  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3407-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running PyJWT check for an updated version of the software for their
         operating system.

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USN-3407-1: PyJWT vulnerability

Ubuntu Security Notice USN-3407-1

30th August, 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
version:

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

To update your system, please follow these instructions: 
https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

CVE-2017-11424

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