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AUSCERT External Security Bulletin Redistribution
USN-3955-1: tcpflow vulnerabilities
26 April 2019
AusCERT Security Bulletin Summary
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2018-18409 CVE-2018-14938
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running tcpflow check for an updated version of the software for
their operating system.
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USN-3955-1: tcpflow vulnerabilities
24 April 2019
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 18.10
o Ubuntu 18.04 LTS
o 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
o 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.
The problem can be corrected by updating your system to the following package
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: https://
In general, a standard system update will make all the necessary changes.
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