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Category:   Application (E-mail Server)  >   Exim Vendors:
(Red Hat Provides Fix) Re: Exim Mail Server May Allow Remote Users to Execute Arbitrary Code with Root-Level Privileges on the Server
SecurityTracker Alert ID:  1001790
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jun 20 2001
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability has been reported in the Exim mail server that may allow a remote user to execute arbitrary code on the server.

It is reported that when Exim is configured to check incoming mail headers for proper syntax, the vulnerability can be triggered. This is configured through the /etc/exim.conf headers_check_syntax option. By default, this option is not set.

The vulnerability reportedly exists in the accept.c module where the moan_smtp_batch() function is called.

A demonstration exploit transcript is provided in the Source Message.

Impact:   A remote user can execute arbitrary code on the server with root-level privileges.
Solution:   Red Hat has provided a fix. See the Source Message for the Red Hat advisory.
Vendor URL: (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Red Hat Linux)

Message History:   This archive entry is a follow-up to the message listed below.
Jun 6 2001 Exim Mail Server May Allow Remote Users to Execute Arbitrary Code with Root-Level Privileges on the Server

 Source Message Contents

Subject:  [RHSA-2001:078-05] Format string bug fixed

                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Format string bug fixed
Advisory ID:       RHSA-2001:078-05
Issue date:        2001-06-11
Updated on:        2001-06-19
Product:           Red Hat Powertools
Keywords:          format string local
Cross references:  

1. Topic:

A locally exploitable format string bug has been fixed in the code that
handles batch SMTP.

2. Relevant releases/architectures:

Red Hat Powertools 6.2 - alpha, i386, sparc

Red Hat Powertools 7.0 - alpha, i386

Red Hat Powertools 7.1 - i386

3. Problem description:

A format string vulnerability exists in the batch SMTP processing code,
which is triggered by any SMTP response that includes a part of its SMTP

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:


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

5. Bug IDs fixed ( for more info):

44077 - local printf format attack in exim-3.22-10

6. RPMs required:

Red Hat Powertools 6.2:





Red Hat Powertools 7.0:




Red Hat Powertools 7.1:



7. Verification:

MD5 sum                           Package Name
de6f8066f402528b3486f36466c2f3c6 6.2/en/powertools/SRPMS/exim-3.22-6x.src.rpm
734fec83e0327062ac9839d280ba165b 6.2/en/powertools/alpha/exim-3.22-6x.alpha.rpm
c0822fe30ddcab6db750cdbd791cd517 6.2/en/powertools/alpha/exim-doc-3.22-6x.alpha.rpm
0e3390552720fb9b29a36e6f7e622bdc 6.2/en/powertools/alpha/exim-mon-3.22-6x.alpha.rpm
a3807b48735ec21e41121e1c57021386 6.2/en/powertools/i386/exim-3.22-6x.i386.rpm
42ce37a662a4daf4ab49a08ce06bb76e 6.2/en/powertools/i386/exim-doc-3.22-6x.i386.rpm
da46d4a412579ae49c886b692d0caf25 6.2/en/powertools/i386/exim-mon-3.22-6x.i386.rpm
bae51ada3762f73bd42cf116107f8ab8 6.2/en/powertools/sparc/exim-3.22-6x.sparc.rpm
97707874783a8dbacbe8f042743e49bd 6.2/en/powertools/sparc/exim-doc-3.22-6x.sparc.rpm
ac5826345a04e0ca42dd16d069283fc5 6.2/en/powertools/sparc/exim-mon-3.22-6x.sparc.rpm
6a2a085b75ae664c9f37f2f127807cb9 7.0/en/powertools/SRPMS/exim-3.22-13.src.rpm
79a93a382a242f4eb196fc57729dffa9 7.0/en/powertools/alpha/exim-3.22-13.alpha.rpm
302f4b270f342a3e7a61336cbb8dece2 7.0/en/powertools/alpha/exim-doc-3.22-13.alpha.rpm
4823aeb034ece53668b87a66de2b83e5 7.0/en/powertools/alpha/exim-mon-3.22-13.alpha.rpm
152d34ee7b459b8719ffc117a87a4975 7.0/en/powertools/i386/exim-3.22-13.i386.rpm
c0663a41ca6fd5812d124dc7dd987bc4 7.0/en/powertools/i386/exim-doc-3.22-13.i386.rpm
37de79b3b1e92a0c3d1ac0e302381f45 7.0/en/powertools/i386/exim-mon-3.22-13.i386.rpm
6a2a085b75ae664c9f37f2f127807cb9 7.1/en/powertools/SRPMS/exim-3.22-13.src.rpm
152d34ee7b459b8719ffc117a87a4975 7.1/en/powertools/i386/exim-3.22-13.i386.rpm
c0663a41ca6fd5812d124dc7dd987bc4 7.1/en/powertools/i386/exim-doc-3.22-13.i386.rpm
37de79b3b1e92a0c3d1ac0e302381f45 7.1/en/powertools/i386/exim-mon-3.22-13.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:

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

8. References:

Copyright(c) 2000, 2001 Red Hat, Inc.


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