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ESB-2016.0686 - [UNIX/Linux][Debian] exim4: Root compromise - Existing account

Date: 15 March 2016

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0686
                           exim4 security update
                               15 March 2016

===========================================================================

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

Product:           exim4
Publisher:         Debian
Operating System:  Debian GNU/Linux 7
                   Debian GNU/Linux 8
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-1531  

Original Bulletin: 
   http://www.debian.org/security/2016/dsa-3517

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running exim4 check for an updated version of the software for their
         operating system.

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- - -------------------------------------------------------------------------
Debian Security Advisory DSA-3517-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
March 14, 2016                        https://www.debian.org/security/faq
- - -------------------------------------------------------------------------

Package        : exim4
CVE ID         : CVE-2016-1531

A local root privilege escalation vulnerability was found in Exim,
Debian's default mail transfer agent, in configurations using the
'perl_startup' option (Only Exim via exim4-daemon-heavy enables Perl
support).

To address the vulnerability, updated Exim versions clean the complete
execution environment by default, affecting Exim and subprocesses such
as transports calling other programs, and thus may break existing
installations. New configuration options (keep_environment,
add_environment) were introduced to adjust this behavior.

More information can be found in the upstream advisory at
https://www.exim.org/static/doc/CVE-2016-1531.txt

For the oldstable distribution (wheezy), this problem has been fixed
in version 4.80-7+deb7u2.

For the stable distribution (jessie), this problem has been fixed in
version 4.84.2-1.

For the testing distribution (stretch), this problem has been fixed
in version 4.86.2-1.

For the unstable distribution (sid), this problem has been fixed in
version 4.86.2-1.

We recommend that you upgrade your exim4 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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        http://www.auscert.org.au/render.html?cid=1980

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
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