==========================================================================
Ubuntu Security Notice USN-6037-1
April 28, 2023

Apache Commons Net vulnerability
==========================================================================

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

Apache Commons Net could be made to expose sensitive information
over the network.

Software Description:
- libcommons-net-java: Apache Commons Net - Java client API for basic 
Internet protocols

Details:

ZeddYu Lu discovered that the FTP client from Apache Commons Net trusted
the host from PASV responses by default. A remote attacker with a
malicious FTP server could redirect the client to another server, which
could possibly result in leaked information about services running on 
the private network of the client.

Update instructions:

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

Ubuntu 22.10:
    libcommons-net-java             3.6-1+deb11u1build0.22.10.1

Ubuntu 22.04 LTS:
    libcommons-net-java             3.6-1+deb11u1build0.22.04.1

Ubuntu 20.04 LTS:
    libcommons-net-java             3.6-1+deb11u1build0.20.04.1

Ubuntu 18.04 LTS:
    libcommons-net-java             3.6-1+deb11u1build0.18.04.1

Ubuntu 16.04 ESM:
    libcommons-net-java             3.4-2ubuntu2+esm1

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

References:
https://ubuntu.com/security/notices/USN-6037-1 
<https://ubuntu.com/security/notices/USN-6037-1>
    CVE-2021-37533

Package Information:
https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.22.10.1 
<https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.22.10.1>
https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.22.04.1 
<https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.22.04.1>
https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.20.04.1 
<https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.20.04.1>
https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.18.04.1 
<https://launchpad.net/ubuntu/+source/libcommons-net-java/3.6-1+deb11u1build0.18.04.1>