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.

=========================================================================Ubuntu Security Notice USN-3955-1
April 24, 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

Summary:

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

Details:

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

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

References:
  https://ubuntu.com/security/notices/USN-3955-1
  CVE-2018-14938, CVE-2018-18409

Package Information:
  https://launchpad.net/ubuntu/+source/tcpflow/1.4.5+repack1-4ubuntu0.18.10.1
  https://launchpad.net/ubuntu/+source/tcpflow/1.4.5+repack1-4ubuntu0.18.04.1
  https://launchpad.net/ubuntu/+source/tcpflow/1.4.5+repack1-1ubuntu0.1