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ESB-2016.0546 - [Win][UNIX/Linux][Debian] perl: Reduced security - Existing account

Date: 02 March 2016

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

                               ESB-2016.0546
                           perl security update
                               2 March 2016

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

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

Product:           perl
Publisher:         Debian
Operating System:  Debian GNU/Linux 7
                   Debian GNU/Linux 8
                   UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Reduced Security -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-2381  

Original Bulletin: 
   http://www.debian.org/security/2016/dsa-3501

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

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- - -------------------------------------------------------------------------
Debian Security Advisory DSA-3501-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
March 01, 2016                        https://www.debian.org/security/faq
- - -------------------------------------------------------------------------

Package        : perl
CVE ID         : CVE-2016-2381

Stephane Chazelas discovered a bug in the environment handling in Perl.
Perl provides a Perl-space hash variable, %ENV, in which environment
variables can be looked up.  If a variable appears twice in envp, only
the last value would appear in %ENV, but getenv would return the first.
Perl's taint security mechanism would be applied to the value in %ENV,
but not to the other rest of the environment.  This could result in an
ambiguous environment causing environment variables to be propagated to
subprocesses, despite the protections supposedly offered by taint
checking.

With this update Perl changes the behavior to match the following:

 a) %ENV is populated with the first environment variable, as getenv
    would return.
 b) Duplicate environment entries are removed.

For the oldstable distribution (wheezy), this problem has been fixed
in version 5.14.2-21+deb7u3.

For the stable distribution (jessie), this problem has been fixed in
version 5.20.2-3+deb8u4.

For the unstable distribution (sid), this problem will be fixed in
version 5.22.1-8.

We recommend that you upgrade your perl 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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