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CERT Advisory
CA-2002-05 Multiple Vulnerabilities in PHP fileupload
Original
release date: February 27, 2002
Last revised: --
Source: CERT/CC
A complete
revision history can be found at the end of this file.
Systems
Affected
* Web
servers running PHP
Overview
Multiple
vulnerabilities exist in the PHP scripting language. These
vulnerabilities could allow a remote attacker to execute arbitrary
code with the privileges of the PHP process.
I. Description
PHP is
a scripting language widely used in web development. PHP can be
installed on a variety of web servers, including Apache, IIS, Caudium,
Netscape and iPlanet, OmniHTTPd and others. Vulnerabilities in the
php_mime_split function may allow an intruder to execute arbitrary
code with the privileges of the web server. For additional details,
see
http://security.e-matters.de/advisories/012002.html
Web servers
that do not have PHP installed are not affected by this
vulnerability.
The CERT/CC
is tracking this set of vulnerabilities as VU#297363. At
this time, these vulnerabilities have not been assigned a CVE
identifier.
II. Impact
Intruders
can execute arbitrary code with the privileges of the web
server, or interrupt normal operations of the web server.
III. Solution
Apply a
Patch
Upgrade
to PHP version 4.1.2, available from
http://www.php.net/do_download.php?download_file=php-4.1.2.tar.gz
If upgrading
is not possible, apply patches as described at
http://www.php.net/downloads.php:
* For PHP 4.10/4.11
http://www.php.net/do_download.php?download_file=rfc1867.c.diff-4.1.x.gz
* For PHP 4.06
http://www.php.net/do_download.php?download_file=rfc1867.c.diff-4.0.6.gz
* For PHP 3.0
http://www.php.net/do_download.php?download_file=mime.c.diff-3.0.gz
If you
are using version 4.20-dev, you are not affected by this
vulnerability. Quoting from
http://security.e-matters.de/advisories/012002.htm:
"[U]sers
running PHP 4.2.0-dev from cvs are not vulnerable to any
of the described bugs because the fileupload code was completly
rewritten for the 4.2.0 branch."
Disable
fileuploads
If upgrading
is not possible or a patch cannot be applied, you can
avoid these vulnerabilities by disabling fileupload support. Edit the
PHP configuration file php.ini as follows:
file_uploads
= off
Note that
this setting only applies to version 4.0.3 and above.
However, this will prevent you from using fileuploads, which may not
be acceptable in your environment.
Appendix
A. - Vendor Information
This appendix
contains information provided by vendors for this
advisory. When vendors report new information to the CERT/CC, we
update this section and note the changes in our revision history. If
a
particular vendor is not listed below, we have not received their
comments.
Apache
Software Foundation
Information
about this vulnerability is available from
http://www.php.net
FreeBSD
FreeBSD
does not include any version of PHP by default, and so is not
vulnerable. However, the FreeBSD Ports Collection does contain both
PHP3 and PHP4 packages. Updates to the PHP packages are in progress
and corrected packages will be available in the near future.
MandrakeSoft
MandrakeSoft
distributes PHP in all distributions and we are currently
working on patching our versions of PHP for Linux-Mandrake 7.1 and
7.2; Mandrake Linux 8.0, 8.0/ppc, 8.1, and 8.1/ia64; Single Network
Firewall 7.2; Corporate Server 1.0.1.
We anticipate
having the updates out by the end of the week.
Microsoft
We do
not use PHP in any products.
NCSA
NCSA does
not include PHP as an add-in or bundled component in any
products distributed.
Red Hat
Red Hat
was notified of this issue on 27th February 2002. All
supported versions of Red Hat Linux ship with PHP packages that are
affected by these vulnerabilities. We will shortly be releasing errata
packages which contain patched versions that are not vulnerable. The
errata packages and our advisory will be available on our web site at
the URL below. At the same time users of the Red Hat Network will be
able to update their systems to patched versions using the up2date
tool.
http://www.redhat.com/support/errata/RHSA-2002-035.html
_________________________________________________________________
The CERT
Coordination Center thanks Stefan Esser, upon whose advisory
this document is largely based.
_________________________________________________________________
Author:
Shawn V. Hernan
_________________________________________________________________
Appendix
B. - References
1. http://www.kb.cert.org/vuls/id/297363
2. http://security.e-matters.de/advisories/012002.html
3. http://www.iss.net/security_center/static/8281.php
______________________________________________________________________
This document
is available from:
http://www.cert.org/advisories/CA-2002-05.html
______________________________________________________________________
CERT/CC
Contact Information
Email:
cert@cert.org
Phone: +1 412-268-7090 (24-hour hotline)
Fax: +1 412-268-6989
Postal address:
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890
U.S.A.
CERT/CC
personnel answer the hotline 08:00-17:00 EST(GMT-5) /
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______________________________________________________________________
NO WARRANTY
Any material furnished by Carnegie Mellon University and the Software
Engineering Institute is furnished on an "as is" basis. Carnegie
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or
implied as to any matter including, but not limited to, warranty of
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_________________________________________________________________
Conditions
for use, disclaimers, and sponsorship information
Copyright
2002 Carnegie Mellon University.
Revision
History
February 27, 2002: Initial release
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