Published:
27 February 2002
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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.101 -- CERT Advisory CA-2002-05 Multiple Vulnerabilities in PHP fileupload 28 February 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: PHP (php_mime_split function) Platform: Web servers running PHP Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- 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) / EDT(GMT-4) Monday through Friday; they are on call for emergencies during other hours, on U.S. holidays, and on weekends. Using encryption We strongly urge you to encrypt sensitive information sent by email. Our public PGP key is available from http://www.cert.org/CERT_PGP.key If you prefer to use DES, please call the CERT hotline for more information. Getting security information CERT publications and other security information are available from our web site http://www.cert.org/ To subscribe to the CERT mailing list for advisories and bulletins, send email to majordomo@cert.org. Please include in the body of your message subscribe cert-advisory * "CERT" and "CERT Coordination Center" are registered in the U.S. Patent and Trademark Office. ______________________________________________________________________ NO WARRANTY Any material furnished by Carnegie Mellon University and the Software Engineering Institute is furnished on an "as is" basis. Carnegie Mellon University makes no warranties of any kind, either expressed or implied as to any matter including, but not limited to, warranty of fitness for a particular purpose or merchantability, exclusivity or results obtained from use of the material. Carnegie Mellon University does not make any warranty of any kind with respect to freedom from patent, trademark, or copyright infringement. _________________________________________________________________ Conditions for use, disclaimers, and sponsorship information Copyright 2002 Carnegie Mellon University. Revision History February 27, 2002: Initial release - -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.8 iQCVAwUBPH1T3KCVPMXQI2HJAQGMbwP+NglOFSnTqmCynobjzrF8Onalm5cHNePn +fTVP3JVrw5ktpyxtjnqveoMzaai0utVMlIDh4K34MOyipSD37W0ZLRezs0okyN0 bQt1UTW+pfBQX8CsZ1anCncEmF0/+fBcl3iNtp7jAT99PJveRCsH8GJVpHx/4nT1 pHvl8ng0VWs= =+NsK - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the original authors to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPH4QnSh9+71yA2DNAQHGfQQAgakMz/FBSOY1Ge5G9MRGjoozIkSmW2S5 C6DNY/ga9K3rcaxMTzZRFS7Vih4fEoTkCgfXqktYyyNcyn8QmjgFIAU0YbuA6msZ 8ZYuzudvkw8TZzQmsoncIzG6TJNohQNyHzKUeqDo/p+aJ5OcOyRtEFQ95lr4a4oS svaso3dzWRw= =mbtz -----END PGP SIGNATURE-----