An iperf3 security update has been released for Ubuntu Linux 22.04 LTS.

[USN-6431-3] iperf3 vulnerability

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Ubuntu Security Notice USN-6431-3
October 16, 2023

iperf3 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS (Available with Ubuntu Pro)

Summary:

iperf3 could be made to to stop responding if it received specially
crafted network traffic.

Software Description:
- iperf3: Internet Protocol bandwidth measuring tool

Details:

USN-6431-1 fixed a vulnerability in iperf3. This update provides
the corresponding update for Ubuntu 22.04 LTS.

Original advisory details:

 Jorge Sancho Larraz discovered that iperf3 did not properly manage certain
 inputs, which could cause the server process to stop responding, waiting
 for input on the control connection. A remote attacker could possibly use
 this issue to cause a denial of service. (LP: #2038654)

Update instructions:

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

Ubuntu 22.04 LTS (Available with Ubuntu Pro):
  iperf3                          3.9-1+deb11u1ubuntu0.1~esm1
  libiperf0                       3.9-1+deb11u1ubuntu0.1~esm1

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

References:
  https://ubuntu.com/security/notices/USN-6431-3
  https://ubuntu.com/security/notices/USN-6431-1
  https://launchpad.net/bugs/2038654