USN-3955-1: tcpflow vulnerabilities

24 April 2019

tcpflow vulnerabilities

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

  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


tcpflow could be made to crash or expose sensitive information over the network if it opened a specially crafted file or received specially crafted network traffic.

Software Description

  • tcpflow - TCP flow recorder


It was discovered that tcpflow incorrectly handled certain malformed network packets. A remote attacker could send these packets to a target system, causing tcpflow to crash or possibly disclose sensitive information.

Update instructions

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

Ubuntu 18.10
tcpflow - 1.4.5+repack1-4ubuntu0.18.10.1
tcpflow-nox - 1.4.5+repack1-4ubuntu0.18.10.1
Ubuntu 18.04 LTS
tcpflow - 1.4.5+repack1-4ubuntu0.18.04.1
tcpflow-nox - 1.4.5+repack1-4ubuntu0.18.04.1
Ubuntu 16.04 LTS
tcpflow - 1.4.5+repack1-1ubuntu0.1
tcpflow-nox - 1.4.5+repack1-1ubuntu0.1

To update your system, please follow these instructions:

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