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AUSCERT External Security Bulletin Redistribution
USN-4263-1: Sudo vulnerability
4 February 2020
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
CVE Names: CVE-2019-18634
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USN-4263-1: Sudo vulnerability
3 February 2020
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 19.10
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Sudo could allow unintended access to the administrator account.
o sudo - Provide limited super user privileges to specific users
Joe Vennix discovered that Sudo incorrectly handled memory operations when the
pwfeedback option is enabled. A local attacker could possibly use this issue to
obtain unintended access to the administrator account.
The problem can be corrected by updating your system to the following package
sudo - 1.8.27-1ubuntu4.1
sudo-ldap - 1.8.27-1ubuntu4.1
Ubuntu 18.04 LTS
sudo - 1.8.21p2-3ubuntu1.2
sudo-ldap - 1.8.21p2-3ubuntu1.2
Ubuntu 16.04 LTS
sudo - 1.8.16-0ubuntu1.9
sudo-ldap - 1.8.16-0ubuntu1.9
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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