=========================================================================Ubuntu Security Notice USN-5354-1
March 30, 2022

twisted vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Twisted.

Software Description:
- twisted: Event-based framework for internet applications

Details:

It was discovered that Twisted incorrectly filtered HTTP headers when 
clients are being redirected to another origin. A remote attacker could 
use this issue to obtain sensitive information. (CVE-2022-21712)

It was discovered that Twisted incorrectly processed SSH handshake data 
on connection establishments. A remote attacker could use this issue to 
cause Twisted to crash, resulting in a denial of service. (CVE-2022-21716)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
python3-twisted 20.3.0-7ubuntu1.1
python3-twisted-bin 20.3.0-7ubuntu1.1

Ubuntu 20.04 LTS:
python3-twisted 18.9.0-11ubuntu0.20.04.2
python3-twisted-bin 18.9.0-11ubuntu0.20.04.2

Ubuntu 18.04 LTS:
python-twisted 17.9.0-2ubuntu0.3
python-twisted-bin 17.9.0-2ubuntu0.3
python3-twisted 17.9.0-2ubuntu0.3
python3-twisted-bin 17.9.0-2ubuntu0.3

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

References:
https://ubuntu.com/security/notices/USN-5354-1
CVE-2022-21712, CVE-2022-21716

Package Information:
https://launchpad.net/ubuntu/+source/twisted/20.3.0-7ubuntu1.1
https://launchpad.net/ubuntu/+source/twisted/18.9.0-11ubuntu0.20.04.2
https://launchpad.net/ubuntu/+source/twisted/17.9.0-2ubuntu0.3