ESB-2018.0432 - [Ubuntu] exim4: Execute arbitrary code/commands - Remote/unauthenticated 2018-02-13

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0432
                            Exim vulnerability
                             13 February 2018

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

Product:           exim4
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6789  

Reference:         ESB-2018.0418

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3565-1

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Ubuntu Security Notice USN-3565-1

12th February, 2018
exim4 vulnerability

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

    Ubuntu 17.10
    Ubuntu 16.04 LTS
    Ubuntu 14.04 LTS

Summary

Exim could be made to crash or run programs if it received specially crafted network traffic.

Software description

    exim4 - Exim is a mail transport agent

Details

Meh Chang discovered that Exim incorrectly handled memory in certain
decoding operations. A remote attacker could use this issue to cause Exim
to crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions

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

Ubuntu 17.10:
    exim4-daemon-heavy 4.89-5ubuntu1.3 
    exim4-daemon-light 4.89-5ubuntu1.3 
Ubuntu 16.04 LTS:
    exim4-daemon-heavy 4.86.2-2ubuntu2.3 
    exim4-daemon-light 4.86.2-2ubuntu2.3 
Ubuntu 14.04 LTS:
    exim4-daemon-heavy 4.82-3ubuntu2.4 
    exim4-daemon-light 4.82-3ubuntu2.4 

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

CVE-2018-6789

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