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AUSCERT External Security Bulletin Redistribution
USN-4168-1: Libidn2 vulnerabilities
30 October 2019
AusCERT Security Bulletin Summary
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
CVE Names: CVE-2019-18224 CVE-2019-12290
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running Libidn2 check for an updated version of the software for
their operating system.
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USN-4168-1: Libidn2 vulnerabilities
29 October 2019
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.04
o Ubuntu 18.04 LTS
Several security issues were fixed in Libidn2.
o libidn2 - Internationalized domain names (IDNA2008/TR46) command line tool
It was discovered that Libidn2 incorrectly handled certain inputs. A attacker
could possibly use this issue to impersonate domains. (CVE-2019-12290)
It was discovered that Libidn2 incorrectly handled certain inputs. An attacker
could possibly use this issue to execute arbitrary code. (CVE-2019-18224)
The problem can be corrected by updating your system to the following package
idn2 - 2.0.5-1ubuntu0.3
libidn2-0 - 2.0.5-1ubuntu0.3
Ubuntu 18.04 LTS
idn2 - 2.0.4-1.1ubuntu0.2
libidn2-0 - 2.0.4-1.1ubuntu0.2
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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