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                   Red Hat Security Advisory

Synopsis:          Updated elm packages fix vulnerability in frm command
Advisory ID:       RHSA-2004:009-01
Issue date:        2004-01-07
Updated on:        2004-01-08
Product:           Red Hat Enterprise Linux
Keywords:          electronic mailer
Cross references:  
Obsoletes:         
CVE Names:         CAN-2003-0966
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1. Topic:

Updated elm packages are now available that fix a buffer overflow
vulnerability in the 'frm' command.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64

3. Problem description:

Elm is a terminal mode email user agent.  The frm command is provided as
part of the Elm packages and gives a summary list of the sender and subject
of selected messages in a mailbox or folder.

A buffer overflow vulnerability was found in the frm command.  An attacker
could create a message with an overly long Subject line such that when the
frm command is run by a victim arbitrary code is executed.  The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2003-0966 to this issue.

Users of the frm command should update to these erratum packages, which
contain a backported security patch that corrects this issue.

Red Hat would like to thank Paul Rubin for discovering and disclosing this
issue.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL
Certificate Errors, you need to install a version of the
up2date client with an updated certificate.  The latest version of
up2date is available from the Red Hat FTP site and may also be
downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

112078 - CAN-2003-0966 buffer overflow in frm command

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/2.1AS/en/os/SRPMS/elm-2.5.6-4.src.rpm

i386:
Available from Red Hat Network: elm-2.5.6-4.i386.rpm

ia64:
Available from Red Hat Network: elm-2.5.6-4.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/2.1AW/en/os/SRPMS/elm-2.5.6-4.src.rpm

ia64:
Available from Red Hat Network: elm-2.5.6-4.ia64.rpm



7. Verification:

MD5 sum                          Package Name
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b27e2db787fc0e1ad37893bf8c2b0902 2.1AS/en/os/SRPMS/elm-2.5.6-4.src.rpm
138f4cd1e539d112680862df967e7d71 2.1AS/en/os/i386/elm-2.5.6-4.i386.rpm
40bd3722f1fcb86b3524174381daefe9 2.1AS/en/os/ia64/elm-2.5.6-4.ia64.rpm
b27e2db787fc0e1ad37893bf8c2b0902 2.1AW/en/os/SRPMS/elm-2.5.6-4.src.rpm
40bd3722f1fcb86b3524174381daefe9 2.1AW/en/os/ia64/elm-2.5.6-4.ia64.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/keys.html

You can verify each package with the following command:
    
    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    
    md5sum <filename>


8. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0966

9. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
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