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AUSCERT External Security Bulletin Redistribution
USN-4263-2: Sudo vulnerability
6 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-4263-2: Sudo vulnerability
5 February 2020
A security issue affects these releases of Ubuntu and its derivatives:
o Ubuntu 14.04 ESM
o Ubuntu 12.04 ESM
Sudo could allow unintended access to the administrator account.
o sudo - Provide limited super user privileges to specific users
USN-4263-1 fixed a vulnerability in Sudo. This update provides the
corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
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
Ubuntu 14.04 ESM
sudo - 1.8.9p5-1ubuntu1.5+esm3
sudo-ldap - 1.8.9p5-1ubuntu1.5+esm3
Ubuntu 12.04 ESM
sudo - 1.8.3p1-1ubuntu3.9
sudo-ldap - 1.8.3p1-1ubuntu3.9
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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