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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3410
                      USN-4124-1: Exim vulnerability
                             9 September 2019

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

Product:           exim4
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15846  

Reference:         ESB-2019.3398
                   ESB-2019.3394

Original Bulletin: 
   https://usn.ubuntu.com/4124-1/

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USN-4124-1: Exim vulnerability
6 September 2019

exim4 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 19.04
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Summary

Exim could be made to run programs as an administrator if it received specially
crafted network traffic.

Software Description

  o exim4 - Exim is a mail transport agent

Details

It was discovered that Exim incorrectly handled certain decoding operations. A
remote attacker could possibly use this issue to execute arbitrary commands.

Update instructions

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

Ubuntu 19.04
    exim4-daemon-heavy - 4.92-4ubuntu1.3
    exim4-daemon-light - 4.92-4ubuntu1.3
Ubuntu 18.04 LTS
    exim4-daemon-heavy - 4.90.1-1ubuntu1.4
    exim4-daemon-light - 4.90.1-1ubuntu1.4
Ubuntu 16.04 LTS
    exim4-daemon-heavy - 4.86.2-2ubuntu2.5
    exim4-daemon-light - 4.86.2-2ubuntu2.5

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-2019-15846
  o LP: 1843041

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