Sudo: Root Compromise -- Existing Account

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.0400
                      USN-4263-1: Sudo vulnerability
                              4 February 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Sudo
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-18634  

Reference:         ESB-2020.0390
                   ESB-2020.0387
                   ESB-2020.0351

Original Bulletin: 
   https://usn.ubuntu.com/4263-1/

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USN-4263-1: Sudo vulnerability
3 February 2020

sudo vulnerability
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

Summary

Sudo could allow unintended access to the administrator account.

Software Description

  o sudo - Provide limited super user privileges to specific users

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.

Update instructions

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

Ubuntu 19.10
    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://
wiki.ubuntu.com/Security/Upgrades .

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

References

  o CVE-2019-18634

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