ESB-2018.0328 - [UNIX/Linux][Ubuntu] Dovecot: Multiple vulnerabilities 2018-02-02

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0328
                          Dovecot vulnerabilities
                              2 February 2018

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

Product:           Dovecot
Publisher:         Ubuntu
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Ubuntu
Impact/Access:     Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-15132 CVE-2013-6171 

Reference:         ESB-2013.1622

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3556-2

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running Dovecot check for an updated version of the software for 
         their operating system.

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Ubuntu Security Notice USN-3556-2

1st February, 2018
dovecot vulnerabilities

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

    Ubuntu 12.04 LTS

Summary

Several security issues were fixed in Dovecot.
Software description

    dovecot - IMAP and POP3 email server

Details

USN-3556-1 fixed vulnerabilities in Dovecot. This update
provides the corresponding update for Ubuntu 12.04 ESM.

It was discovered that Dovecot incorrectly handled certain authentications.
An attacker could possibly use this to bypass authentication and access
sensitive information. (CVE-2013-6171)

Original advisory details:

It was discovered that Dovecot incorrectly handled certain authentications.
An attacker could possibly use this to cause a denial of service.
(CVE-2017-15132)

Update instructions

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

Ubuntu 12.04 LTS:
    dovecot-core 1:2.0.19-0ubuntu2.4

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-2013-6171, CVE-2017-15132

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