USN-3731-1: LFTP vulnerability

6 August 2018

lftp vulnerability

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

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


LFTP could be made to crash if it received specially crafted file.

Software Description

  • lftp - Sophisticated command-line FTP/HTTP/BitTorrent client programs


It was discovered that LFTP incorrectly handled certain files. An attacker could possibly use this issue to cause a denial of service.

Update instructions

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

Ubuntu 18.04 LTS
lftp - 4.8.1-1ubuntu0.1
Ubuntu 16.04 LTS
lftp - 4.6.3a-1ubuntu0.1
Ubuntu 14.04 LTS
lftp - 4.4.13-1ubuntu0.1

To update your system, please follow these instructions:

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