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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