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ESB-2014.2415 - [Debian] bsd-mailx and heirloom-mailx: Execute arbitrary code/commands - Existing account

Date: 17 December 2014
References: ESB-2014.2413  

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

                               ESB-2014.2415
               bsd-mailx and heirloom-mailx security updates
                             17 December 2014

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

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

Product:           bsd-mailx
                   heirloom-mailx
Publisher:         Debian
Operating System:  Debian GNU/Linux 7
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2014-7844 CVE-2004-2771 

Reference:         ESB-2014.2413

Original Bulletin: 
   http://www.debian.org/security/2014/dsa-3104
   http://www.debian.org/security/2014/dsa-3105

Comment: This bulletin contains two (2) Debian security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

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- - -------------------------------------------------------------------------
Debian Security Advisory DSA-3104-1                   security@debian.org
http://www.debian.org/security/                            Florian Weimer
December 16, 2014                      http://www.debian.org/security/faq
- - -------------------------------------------------------------------------

Package        : bsd-mailx
CVE ID         : CVE-2014-7844

It was discovered that bsd-mailx, an implementation of the "mail"
command, had an undocumented feature which treats syntactically valid
email addresses as shell commands to execute.

Users who need this feature can re-enable it using the "expandaddr" in
an appropriate mailrc file.  This update also removes the obsolete -T
option.  An older security vulnerability, CVE-2004-2771, had already
been addressed in the Debian's bsd-mailx package.

Note that this security update does not remove all mailx facilities
for command execution, though.  Scripts which send mail to addresses
obtained from an untrusted source (such as a web form) should use the
"--" separator before the email addresses (which was fixed to work
properly in this update), or they should be changed to invoke
"mail -t" or "sendmail -i -t" instead, passing the recipient addresses
as part of the mail header.

For the stable distribution (wheezy), this problem has been fixed in
version 8.1.2-0.20111106cvs-1+deb7u1.

We recommend that you upgrade your bsd-mailx 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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- - -------------------------------------------------------------------------
Debian Security Advisory DSA-3105-1                   security@debian.org
http://www.debian.org/security/                            Florian Weimer
December 16, 2014                      http://www.debian.org/security/faq
- - -------------------------------------------------------------------------

Package        : heirloom-mailx
CVE ID         : CVE-2004-2771 CVE-2014-7844

Two security vulnerabilities were discovered in Heirloom mailx, an
implementation of the "mail" command:

CVE-2004-2771

    mailx interprets interprets shell meta-characters in certain email
    addresses.

CVE-2014-7844

    An unexpected feature of mailx treats syntactically valid email
    addresses as shell commands to execute.

Shell command execution can be re-enabled using the "expandaddr"
option.

Note that this security update does not remove all mailx facilities
for command execution, though.  Scripts which send mail to addresses
obtained from an untrusted source (such as a web form) should use the
"--" separator before the email addresses (which was fixed to work
properly in this update), or they should be changed to invoke
"mail -t" or "sendmail -i -t" instead, passing the recipient addresses
as part of the mail header.

For the stable distribution (wheezy), these problems have been fixed in
version 12.5-2+deb7u1.

We recommend that you upgrade your heirloom-mailx 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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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        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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