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Ubuntu Security Notice USN-6159-1
June 13, 2023

python-tornado vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Tornado could be made to redirect users to arbitrary web site if it opened a
specially crafted URL.

Software Description:
- python-tornado: scalable, non-blocking web server and tools - documentation

Details:

It was discovered that Tornado incorrectly handled certain redirect.
An remote attacker could possibly use this issue to redirect a user to an
arbitrary web site and conduct a phishing attack by having user access a
specially crafted URL.

Update instructions:

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

Ubuntu 23.04:
  python3-tornado                 6.2.0-3ubuntu0.1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  python-tornado                  4.2.1-1ubuntu3.1+esm1
  python3-tornado                 4.2.1-1ubuntu3.1+esm1

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

References:
  https://ubuntu.com/security/notices/USN-6159-1
  CVE-2023-28370

Package Information:
  https://launchpad.net/ubuntu/+source/python-tornado/6.2.0-3ubuntu0.1