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.
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Ubuntu Security Notice USN-5526-1
July 20, 2022
pyjwt vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
PyJWT could allow signature forgery.
Software Description:
- pyjwt: Python 3 implementation of JSON Web Token
Details:
Aapo Oksman discovered that PyJWT incorrectly handled signatures
constructed from SSH public keys. A remote attacker could use this to forge
a JWT signature.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS:
python3-jwt 2.3.0-1ubuntu0.1
Ubuntu 20.04 LTS:
python3-jwt 1.7.1-2ubuntu2.1
Ubuntu 18.04 LTS:
python-jwt 1.5.3+ds1-1ubuntu0.1
python3-jwt 1.5.3+ds1-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5526-1
CVE-2022-29217
Package Information:
https://launchpad.net/ubuntu/+source/pyjwt/2.3.0-1ubuntu0.1
https://launchpad.net/ubuntu/+source/pyjwt/1.7.1-2ubuntu2.1
https://launchpad.net/ubuntu/+source/pyjwt/1.5.3+ds1-1ubuntu0.1