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Category:   Application (E-mail Client)  >   Elm Vendors:   [Multiple Authors/Vendors]
(Red Hat Issues Fix) Elm Buffer Overflow in SMTP 'Expires' Header Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1014781
SecurityTracker URL:  http://securitytracker.com/id/1014781
CVE Reference:   CVE-2005-2665   (Links to External Site)
Date:  Aug 24 2005
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.5 PL5, 2.5 PL6, and 2.5 PL7; possibly others
Description:   A vulnerability was reported in Elm. A remote user can cause arbitrary code to be executed on the target user's system.

The software does not properly parse SMTP Expires header lines. A remote user can send e-mail with a specially crafted Expires header value. Then, when the target user loads Elm or views the inbox, a buffer overflow will be triggered and arbitrary code may be executed. The code will run with the privileges of the target user.

Ulf Harnhammar reported this vulnerability.

Impact:   A remote user can cause arbitrary code to be executed on the target user's system with the privileges of the target user.
Solution:   Red Hat has released a fix.

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

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/elm-2.5.6-6.src.rpm
479f0512285ad516895777c2e995a9a7 elm-2.5.6-6.src.rpm

i386:
71cba99974d435407927cffd9901eaf9 elm-2.5.6-6.i386.rpm

ia64:
6272e2c92c5eb207992b60d79c096565 elm-2.5.6-6.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/elm-2.5.6-6.src.rpm
479f0512285ad516895777c2e995a9a7 elm-2.5.6-6.src.rpm

ia64:
6272e2c92c5eb207992b60d79c096565 elm-2.5.6-6.ia64.rpm

Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  2.1

Message History:   This archive entry is a follow-up to the message listed below.
Aug 20 2005 Elm Buffer Overflow in SMTP 'Expires' Header Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [RHSA-2005:755-01] Critical: elm security update


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Critical: elm security update
Advisory ID:       RHSA-2005:755-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2005-755.html
Issue date:        2005-08-23
Updated on:        2005-08-23
Product:           Red Hat Enterprise Linux
CVE Names:         CAN-2005-2665
- ---------------------------------------------------------------------

1. Summary:

An updated elm package is now available that fixes a buffer overflow issue
for Red Hat Enterprise Linux 2.1 AS and AW.

This update has been rated as having critical security impact by the Red
Hat Security Response Team.

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 client.

A buffer overflow flaw in Elm was discovered that was triggered by viewing
a mailbox containing a message with a carefully crafted 'Expires' header. 
An attacker could create a malicious message that would execute arbitrary
code with the privileges of the user who received it.  The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name
CAN-2005-2665 to this issue.

Users of Elm should update to this updated package, which contains a
backported patch that corrects this issue.

4. Solution:

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

This update is available via Red Hat Network.  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.

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

166580 - CAN-2005-2665 elm buffer overflow


6. RPMs required:

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

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/elm-2.5.6-6.src.rpm
479f0512285ad516895777c2e995a9a7  elm-2.5.6-6.src.rpm

i386:
71cba99974d435407927cffd9901eaf9  elm-2.5.6-6.i386.rpm

ia64:
6272e2c92c5eb207992b60d79c096565  elm-2.5.6-6.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/elm-2.5.6-6.src.rpm
479f0512285ad516895777c2e995a9a7  elm-2.5.6-6.src.rpm

ia64:
6272e2c92c5eb207992b60d79c096565  elm-2.5.6-6.ia64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2665

8. Contact:

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

Copyright 2005 Red Hat, Inc.

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