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Category:   Application (Web Server/CGI)  >   mod_python Vendors:   Apache Software Foundation
(Fedora Issues Fix for RH Linux) Apache mod_python String Processing Bug Lets Remote Users Crash the Web Server
SecurityTracker Alert ID:  1011511
SecurityTracker URL:
CVE Reference:   CVE-2003-0973   (Links to External Site)
Date:  Oct 3 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.x prior to 3.0.4, 2.x prior to 2.7.9
Description:   A vulnerability was reported in the Apache mod_python module in the processing of certain query strings. A remote user can cause denial of service conditions.

It is reported that a remote user can send a specific query string to be processed by mod_python, causing the Apache httpd process to crash. No further details were provided.

Impact:   A remote user can cause the Apache web server process to crash.
Solution:   Fedora has released a fix.

Red Hat Linux 7.3:



The SHA1 verification checksums are:

49aa1436fc8982e616b5957554485e278d772f9b 7.3/updates/SRPMS/mod_python-2.7.8-
1cb0e3eccd14fbfb220bf26259b509ff17ed9eec 7.3/updates/i386/mod_python-2.7.8-

Vendor URL: (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  7.3

Message History:   This archive entry is a follow-up to the message listed below.
Nov 28 2003 Apache mod_python String Processing Bug Lets Remote Users Crash the Web Server

 Source Message Contents

Subject:  [Full-Disclosure] [FLSA-2004:1325] Updated mod_python packages fix security vulnerability

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               Fedora Legacy Update Advisory

Synopsis:          Updated mod_python resolves security vulnerability
Advisory ID:       FLSA:1325
Issue date:        2004-10-03
Product:           Red Hat Linux
Keywords:          Security
Cross references:
CVE Names:         CAN-2003-0973

1. Topic:

Updated mod_python packages that fix a security vulnerability are now

mod_python embeds the Python language interpreter within the Apache httpd

2. Relevant releases/architectures:

Red Hat Linux 7.3 - i386

3. Problem description:

A bug has been found in mod_python versions 3.0.3 and earlier that can
lead to a denial of service vulnerability. The Common Vulnerabilities and
Exposures project ( has assigned the name CAN-2003-0973 to
this issue.

mod_python users are advised to upgrade to these errata packages,
which contain a backported patch that corrects this bug.

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 yum and apt.  Many
people find this an easier way to apply updates.  To use yum issue:

yum update

or to use apt:

apt-get update; apt-get upgrade

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.  This assumes that you have yum or
apt-get configured for obtaining Fedora Legacy content. Please visit for directions on how to configure yum
and apt-get.

5. Bug IDs fixed: - 1325 - mod_python: denial of service

6. RPMs required:

Red Hat Linux 7.3:



7. Verification:

SHA1 sum                                 Package Name

49aa1436fc8982e616b5957554485e278d772f9b  7.3/updates/SRPMS/mod_python-2.7.8-
1cb0e3eccd14fbfb220bf26259b509ff17ed9eec  7.3/updates/i386/mod_python-2.7.8-

These packages are GPG signed by Fedora Legacy for security.  Our key is
available from http://www.fedoralegacy org/about/security.php

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 sha1sum with the following command:

    sha1sum <filename>

8. References:

9. Contact:

The Fedora Legacy security contact is <>. More
project details at


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Full-Disclosure - We believe in it.


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