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Category:   Application (E-mail Server)  >   Sendmail Vendors:   Sendmail Consortium
(Red Hat Issues Fix for RH Enterprise Linux) Sendmail Prescan Flaw May Let Remote Users Execute Arbitrary Code With Root Privileges
SecurityTracker Alert ID:  1007736
SecurityTracker URL:  http://securitytracker.com/id/1007736
CVE Reference:   CVE-2003-0694   (Links to External Site)
Date:  Sep 17 2003
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, Root access via local system, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8.12.9 and prior versions
Description:   A vulnerability was reported in Sendmail. A local or remote user may be able to execute arbitrary code on the target system.

It is reported that the prescan() function in 'parseaddr.c' contains a flaw [that is different than previously reported prescan flaw]. The report states that various exploit methods are possible, but these exploit methods were not disclosed.

The report indicates that it is confirmed that a local user can exploit this flaw and it is believed that a remote user may also exploit this flaw.

Impact:   A local or remote user may be able to execute arbitrary code with the privileges of the sendmail process.
Solution:   Red Hat has released a fix for Red Hat Enterprise Linux.

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

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

i386:
Available from Red Hat Network: sendmail-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.i386.rpm

ia64:
Available from Red Hat Network: sendmail-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

ia64:
Available from Red Hat Network: sendmail-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

i386:
Available from Red Hat Network: sendmail-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

i386:
Available from Red Hat Network: sendmail-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.i386.rpm

The verification checksums are:

MD5 sum Package Name
c18c4ac78a902833c7ea4d1f406a9c9e 2.1AS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
c67cd8a9072378ef3f5a4cbc0e9651ba 2.1AS/en/os/i386/sendmail-8.11.6-28.72.i386.rpm
8058d5783c13216858a5f014d3edc896 2.1AS/en/os/i386/sendmail-cf-8.11.6-28.72.i386.rpm
e41edf54e1d3662b6da9cc497287a083 2.1AS/en/os/i386/sendmail-devel-8.11.6-28.72.i386.rpm
508b3b33eecd32867595791efc8d8b74 2.1AS/en/os/i386/sendmail-doc-8.11.6-28.72.i386.rpm
68f4b67f3870e59d95abc62513a1ea61 2.1AS/en/os/ia64/sendmail-8.11.6-28.72.ia64.rpm
11a1c9a5afc6b638f3c1f83aae4c351a 2.1AS/en/os/ia64/sendmail-cf-8.11.6-28.72.ia64.rpm
86e16e0d080bfcf89f58075c972a609f 2.1AS/en/os/ia64/sendmail-devel-8.11.6-28.72.ia64.rpm
cec02149ab370ae0a18f7f33a143cb97 2.1AS/en/os/ia64/sendmail-doc-8.11.6-28.72.ia64.rpm
c18c4ac78a902833c7ea4d1f406a9c9e 2.1AW/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
68f4b67f3870e59d95abc62513a1ea61 2.1AW/en/os/ia64/sendmail-8.11.6-28.72.ia64.rpm
11a1c9a5afc6b638f3c1f83aae4c351a 2.1AW/en/os/ia64/sendmail-cf-8.11.6-28.72.ia64.rpm
86e16e0d080bfcf89f58075c972a609f 2.1AW/en/os/ia64/sendmail-devel-8.11.6-28.72.ia64.rpm
cec02149ab370ae0a18f7f33a143cb97 2.1AW/en/os/ia64/sendmail-doc-8.11.6-28.72.ia64.rpm
c18c4ac78a902833c7ea4d1f406a9c9e 2.1ES/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
c67cd8a9072378ef3f5a4cbc0e9651ba 2.1ES/en/os/i386/sendmail-8.11.6-28.72.i386.rpm
8058d5783c13216858a5f014d3edc896 2.1ES/en/os/i386/sendmail-cf-8.11.6-28.72.i386.rpm
e41edf54e1d3662b6da9cc497287a083 2.1ES/en/os/i386/sendmail-devel-8.11.6-28.72.i386.rpm
508b3b33eecd32867595791efc8d8b74 2.1ES/en/os/i386/sendmail-doc-8.11.6-28.72.i386.rpm
c18c4ac78a902833c7ea4d1f406a9c9e 2.1WS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
c67cd8a9072378ef3f5a4cbc0e9651ba 2.1WS/en/os/i386/sendmail-8.11.6-28.72.i386.rpm
8058d5783c13216858a5f014d3edc896 2.1WS/en/os/i386/sendmail-cf-8.11.6-28.72.i386.rpm
e41edf54e1d3662b6da9cc497287a083 2.1WS/en/os/i386/sendmail-devel-8.11.6-28.72.i386.rpm
508b3b33eecd32867595791efc8d8b74 2.1WS/en/os/i386/sendmail-doc-8.11.6-28.72.i386.rpm

Vendor URL:  www.sendmail.org/8.12.10.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  Red Hat Enterprise Linux 2.1

Message History:   This archive entry is a follow-up to the message listed below.
Sep 17 2003 Sendmail Prescan Flaw May Let Remote Users Execute Arbitrary Code With Root Privileges



 Source Message Contents

Subject:  [RHSA-2003:284-01] Updated Sendmail packages fix vulnerability.


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

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

Synopsis:          Updated Sendmail packages fix vulnerability.
Advisory ID:       RHSA-2003:284-01
Issue date:        2003-09-17
Updated on:        2003-09-17
Product:           Red Hat Enterprise Linux
Keywords:          
Cross references:  
Obsoletes:         RHSA-2003:121
CVE Names:         CAN-2003-0694
- ---------------------------------------------------------------------

1. Topic:

Updated Sendmail packages that fix a potentially-exploitable vulnerability
are now available.

2. Relevant releases/architectures:

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

3. Problem description:

Sendmail is a widely used Mail Transport Agent (MTA) and is included in all
Red Hat Enterprise Linux distributions.

There is a bug in the prescan() function of Sendmail versions prior to and
including 8.12.9. The sucessful exploitation of this bug can lead to heap
and stack structure overflows.  Although no exploit currently exists, this
issue is locally exploitable and may also be remotely exploitable.
The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2003-0694 to this issue.

All users are advised to update to these erratum packages containing a
backported patch which corrects these vulnerabilities.

Red Hat would like to thank Michal Zalewski for finding and reporting 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):

104565 - CAN-2003-0694 Sendmail possible remote exploit

6. RPMs required:

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

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

i386:
Available from Red Hat Network: sendmail-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.i386.rpm

ia64:
Available from Red Hat Network: sendmail-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

ia64:
Available from Red Hat Network: sendmail-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.ia64.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

i386:
Available from Red Hat Network: sendmail-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm

i386:
Available from Red Hat Network: sendmail-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-doc-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-devel-8.11.6-28.72.i386.rpm
Available from Red Hat Network: sendmail-cf-8.11.6-28.72.i386.rpm



7. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------
c18c4ac78a902833c7ea4d1f406a9c9e 2.1AS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
c67cd8a9072378ef3f5a4cbc0e9651ba 2.1AS/en/os/i386/sendmail-8.11.6-28.72.i386.rpm
8058d5783c13216858a5f014d3edc896 2.1AS/en/os/i386/sendmail-cf-8.11.6-28.72.i386.rpm
e41edf54e1d3662b6da9cc497287a083 2.1AS/en/os/i386/sendmail-devel-8.11.6-28.72.i386.rpm
508b3b33eecd32867595791efc8d8b74 2.1AS/en/os/i386/sendmail-doc-8.11.6-28.72.i386.rpm
68f4b67f3870e59d95abc62513a1ea61 2.1AS/en/os/ia64/sendmail-8.11.6-28.72.ia64.rpm
11a1c9a5afc6b638f3c1f83aae4c351a 2.1AS/en/os/ia64/sendmail-cf-8.11.6-28.72.ia64.rpm
86e16e0d080bfcf89f58075c972a609f 2.1AS/en/os/ia64/sendmail-devel-8.11.6-28.72.ia64.rpm
cec02149ab370ae0a18f7f33a143cb97 2.1AS/en/os/ia64/sendmail-doc-8.11.6-28.72.ia64.rpm
c18c4ac78a902833c7ea4d1f406a9c9e 2.1AW/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
68f4b67f3870e59d95abc62513a1ea61 2.1AW/en/os/ia64/sendmail-8.11.6-28.72.ia64.rpm
11a1c9a5afc6b638f3c1f83aae4c351a 2.1AW/en/os/ia64/sendmail-cf-8.11.6-28.72.ia64.rpm
86e16e0d080bfcf89f58075c972a609f 2.1AW/en/os/ia64/sendmail-devel-8.11.6-28.72.ia64.rpm
cec02149ab370ae0a18f7f33a143cb97 2.1AW/en/os/ia64/sendmail-doc-8.11.6-28.72.ia64.rpm
c18c4ac78a902833c7ea4d1f406a9c9e 2.1ES/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
c67cd8a9072378ef3f5a4cbc0e9651ba 2.1ES/en/os/i386/sendmail-8.11.6-28.72.i386.rpm
8058d5783c13216858a5f014d3edc896 2.1ES/en/os/i386/sendmail-cf-8.11.6-28.72.i386.rpm
e41edf54e1d3662b6da9cc497287a083 2.1ES/en/os/i386/sendmail-devel-8.11.6-28.72.i386.rpm
508b3b33eecd32867595791efc8d8b74 2.1ES/en/os/i386/sendmail-doc-8.11.6-28.72.i386.rpm
c18c4ac78a902833c7ea4d1f406a9c9e 2.1WS/en/os/SRPMS/sendmail-8.11.6-28.72.src.rpm
c67cd8a9072378ef3f5a4cbc0e9651ba 2.1WS/en/os/i386/sendmail-8.11.6-28.72.i386.rpm
8058d5783c13216858a5f014d3edc896 2.1WS/en/os/i386/sendmail-cf-8.11.6-28.72.i386.rpm
e41edf54e1d3662b6da9cc497287a083 2.1WS/en/os/i386/sendmail-devel-8.11.6-28.72.i386.rpm
508b3b33eecd32867595791efc8d8b74 2.1WS/en/os/i386/sendmail-doc-8.11.6-28.72.i386.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-2003-0694

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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQE/aLKjXlSAg2UNWIIRAqRsAJ9t/jeZ2g8jALrQTarYjomv8mEB8wCgqk9F
w9siewmyvE4vly8sauUMsvw=
=AN/u
-----END PGP SIGNATURE-----

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