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AUSCERT External Security Bulletin Redistribution
USN-4179-1: FriBidi vulnerability
8 November 2019
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
CVE Names: CVE-2019-18397
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running fribidi check for an updated version of the software for
their operating system.
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USN-4179-1: FriBidi vulnerability
7 November 2019
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 19.04
Applications using FriBidi could be made to crash or run programs as your login
if it displayed specially crafted text.
o 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.
The problem can be corrected by updating your system to the following package
libfribidi0 - 1.0.5-3.1ubuntu0.19.10.1
libfribidi0 - 1.0.5-3.1ubuntu0.19.04.1
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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