USN-4179-1: FriBidi vulnerability

07 November 2019

Applications using FriBidi could be made to crash or run programs as your login if it displayed specially crafted text.



  • fribidi - Free Implementation of the Unicode BiDi algorithm (utility)


Alex Murray discovered a stack-based buffer overflow when handling a large
number of unicode isolate directives. An attacker could use this to cause a
denial of service or possibly execute arbitrary code.

Update instructions

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

Ubuntu 19.10
Ubuntu 19.04

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