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Category:   Application (E-mail Server)  >   Sendmail Vendors:   Sendmail Consortium
(Red Hat Issues Fix) Sendmail NULL Character Flaw in Common Name Field Lets Remote Users Spoof Certficiates
SecurityTracker Alert ID:  1023810
SecurityTracker URL:  http://securitytracker.com/id/1023810
CVE Reference:   CVE-2009-4565   (Links to External Site)
Date:  Apr 1 2010
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 8.14.4
Description:   A vulnerability was reported in Sendmail. A remote user can spoof certificates of arbitrary sites.

A remote user can create a certificate with a specially crafted Common Name field that contains a NULL character. Once the certificate is signed by a Certificate Authority, the certificate can be used to spoof a target site's certificate.

Impact:   A remote user can spoof certificates of arbitrary sites.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0237.html

Vendor URL:  www.sendmail.org/releases/8.14.4 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Dec 31 2009 Sendmail NULL Character Flaw in Common Name Field Lets Remote Users Spoof Certficiates



 Source Message Contents

Subject:  [RHSA-2010:0237-05] Low: sendmail security and bug fix update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Low: sendmail security and bug fix update
Advisory ID:       RHSA-2010:0237-05
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0237.html
Issue date:        2010-03-30
CVE Names:         CVE-2006-7176 CVE-2009-4565 
=====================================================================

1. Summary:

Updated sendmail packages that fix two security issues and several bugs are
now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

Sendmail is a very widely used Mail Transport Agent (MTA). MTAs deliver
mail from one machine to another. Sendmail is not a client program, but
rather a behind-the-scenes daemon that moves email over networks or the
Internet to its final destination.

The configuration of sendmail in Red Hat Enterprise Linux was found to not
reject the "localhost.localdomain" domain name for email messages that come
from external hosts. This could allow remote attackers to disguise spoofed
messages. (CVE-2006-7176)

A flaw was found in the way sendmail handled NUL characters in the
CommonName field of X.509 certificates. An attacker able to get a
carefully-crafted certificate signed by a trusted Certificate Authority
could trick sendmail into accepting it by mistake, allowing the attacker to
perform a man-in-the-middle attack or bypass intended client certificate
authentication. (CVE-2009-4565)

Note: The CVE-2009-4565 issue only affected configurations using TLS with
certificate verification and CommonName checking enabled, which is not a
typical configuration.

This update also fixes the following bugs:

* sendmail was unable to parse files specified by the ServiceSwitchFile
option which used a colon as a separator. (BZ#512871)

* sendmail incorrectly returned a zero exit code when free space was low.
(BZ#299951)

* the sendmail manual page had a blank space between the -qG option and
parameter. (BZ#250552)

* the comments in the sendmail.mc file specified the wrong path to SSL
certificates. (BZ#244012)

* the sendmail packages did not provide the MTA capability. (BZ#494408)

All users of sendmail are advised to upgrade to these updated packages,
which resolve these issues.

4. Solution:

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

238540 - CVE-2006-7176 sendmail allows external mail with from address xxx@localhost.localdomain
244012 - Old path to openssl used in sendmail.mc
250552 - the description about option '-qG name' should be modified in the manpage
440616 - there should be %{?dist} instead of %{dist} in the *.spec on the Release: line
449391 - sendmail allows external mail with from address xxx@localhost.localdomain
494408 - Sendmail should provide "MTA"
552622 - CVE-2009-4565 sendmail: incorrect verification of SSL certificate with NUL in name

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/sendmail-8.13.8-8.el5.src.rpm

i386:
sendmail-8.13.8-8.el5.i386.rpm
sendmail-cf-8.13.8-8.el5.i386.rpm
sendmail-debuginfo-8.13.8-8.el5.i386.rpm
sendmail-doc-8.13.8-8.el5.i386.rpm

x86_64:
sendmail-8.13.8-8.el5.x86_64.rpm
sendmail-cf-8.13.8-8.el5.x86_64.rpm
sendmail-debuginfo-8.13.8-8.el5.x86_64.rpm
sendmail-doc-8.13.8-8.el5.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/sendmail-8.13.8-8.el5.src.rpm

i386:
sendmail-debuginfo-8.13.8-8.el5.i386.rpm
sendmail-devel-8.13.8-8.el5.i386.rpm

x86_64:
sendmail-debuginfo-8.13.8-8.el5.i386.rpm
sendmail-debuginfo-8.13.8-8.el5.x86_64.rpm
sendmail-devel-8.13.8-8.el5.i386.rpm
sendmail-devel-8.13.8-8.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/sendmail-8.13.8-8.el5.src.rpm

i386:
sendmail-8.13.8-8.el5.i386.rpm
sendmail-cf-8.13.8-8.el5.i386.rpm
sendmail-debuginfo-8.13.8-8.el5.i386.rpm
sendmail-devel-8.13.8-8.el5.i386.rpm
sendmail-doc-8.13.8-8.el5.i386.rpm

ia64:
sendmail-8.13.8-8.el5.ia64.rpm
sendmail-cf-8.13.8-8.el5.ia64.rpm
sendmail-debuginfo-8.13.8-8.el5.ia64.rpm
sendmail-devel-8.13.8-8.el5.ia64.rpm
sendmail-doc-8.13.8-8.el5.ia64.rpm

ppc:
sendmail-8.13.8-8.el5.ppc.rpm
sendmail-cf-8.13.8-8.el5.ppc.rpm
sendmail-debuginfo-8.13.8-8.el5.ppc.rpm
sendmail-debuginfo-8.13.8-8.el5.ppc64.rpm
sendmail-devel-8.13.8-8.el5.ppc.rpm
sendmail-devel-8.13.8-8.el5.ppc64.rpm
sendmail-doc-8.13.8-8.el5.ppc.rpm

s390x:
sendmail-8.13.8-8.el5.s390x.rpm
sendmail-cf-8.13.8-8.el5.s390x.rpm
sendmail-debuginfo-8.13.8-8.el5.s390.rpm
sendmail-debuginfo-8.13.8-8.el5.s390x.rpm
sendmail-devel-8.13.8-8.el5.s390.rpm
sendmail-devel-8.13.8-8.el5.s390x.rpm
sendmail-doc-8.13.8-8.el5.s390x.rpm

x86_64:
sendmail-8.13.8-8.el5.x86_64.rpm
sendmail-cf-8.13.8-8.el5.x86_64.rpm
sendmail-debuginfo-8.13.8-8.el5.i386.rpm
sendmail-debuginfo-8.13.8-8.el5.x86_64.rpm
sendmail-devel-8.13.8-8.el5.i386.rpm
sendmail-devel-8.13.8-8.el5.x86_64.rpm
sendmail-doc-8.13.8-8.el5.x86_64.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:

https://www.redhat.com/security/data/cve/CVE-2006-7176.html
https://www.redhat.com/security/data/cve/CVE-2009-4565.html
http://www.redhat.com/security/updates/classification/#low

8. Contact:

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

Copyright 2010 Red Hat, Inc.
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