USN-6037-1: Apache Commons Net vulnerability

Releases

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

Packages

• 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

• libcommons-net-java - 3.6-1+deb11u1build0.22.04.1

Ubuntu 20.04

• libcommons-net-java - 3.6-1+deb11u1build0.20.04.1

Ubuntu 18.04

• libcommons-net-java - 3.6-1+deb11u1build0.18.04.1

Ubuntu 16.04

• libcommons-net-java - 3.4-2ubuntu2+esm1
  Available with Ubuntu Pro

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

References

• CVE-2021-37533