PHP Strip_Tags() Function Bypass Vulnerability

BID:10724

Info

PHP Strip_Tags() Function Bypass Vulnerability

Bugtraq ID: 10724
Class: Input Validation Error
CVE: CVE-2004-0595
Remote: Yes
Local: No
Published: Jul 14 2004 12:00AM
Updated: Jul 12 2009 06:16AM
Credit: Stefan Esser <[email protected]> disclosed this vulnerability.
Vulnerable: Trustix Secure Linux 2.1
Trustix Secure Linux 2.0
Trustix Secure Linux 1.5
Trustix Secure Enterprise Linux 2.0
Slackware Linux 10.1
Slackware Linux 10.0
Slackware Linux 9.1
Slackware Linux 9.0
Slackware Linux 8.1
Slackware Linux -current
Redhat Stronghold 4.0
Redhat Fedora Core2
Redhat Fedora Core1
Redhat Enterprise Linux WS 3
Redhat Enterprise Linux ES 3
Redhat Enterprise Linux AS 3
Redhat Desktop 3.0
PHP PHP 5.0 candidate 3
PHP PHP 5.0 candidate 2
PHP PHP 5.0 candidate 1
PHP PHP 4.3.7
PHP PHP 4.3.6
PHP PHP 4.3.5
PHP PHP 4.3.3
+ S.u.S.E. Linux Personal 9.0 x86_64
 + S.u.S.E. Linux Personal 9.0
+ Turbolinux Home
+ Turbolinux Turbolinux 10 F...
 + Turbolinux Turbolinux Desktop 10.0
PHP PHP 4.3.2
PHP PHP 4.3.1
+ Mandriva Linux Mandrake 9.1 ppc
 + Mandriva Linux Mandrake 9.1
+ OpenPKG OpenPKG Current
 + S.u.S.E. Linux Personal 8.2
PHP PHP 4.3
PHP PHP 4.2.3
+ EnGarde Secure Linux 1.0.1
+ MandrakeSoft Corporate Server 2.1 x86_64
 + MandrakeSoft Corporate Server 2.1
+ Mandriva Linux Mandrake 9.0
+ Turbolinux Turbolinux Server 8.0
+ Turbolinux Turbolinux Server 7.0
+ Turbolinux Turbolinux Workstation 8.0
+ Turbolinux Turbolinux Workstation 7.0
PHP PHP 4.2.2
+ Gentoo Linux 1.4 _rc1
 + Gentoo Linux 1.2
+ OpenPKG OpenPKG 1.1
+ Redhat Linux 8.0 i386
 + Redhat Linux 8.0
+ SuSE Linux 8.1
PHP PHP 4.2.1
- FreeBSD FreeBSD 4.6
- FreeBSD FreeBSD 4.5
- FreeBSD FreeBSD 4.4
- FreeBSD FreeBSD 4.3
+ Slackware Linux 8.1
PHP PHP 4.2 .0
PHP PHP 4.1.2
+ Apple Mac OS X 10.1.5
+ Apple Mac OS X 10.1.4
+ Apple Mac OS X 10.1.3
+ Apple Mac OS X 10.1.2
+ Apple Mac OS X 10.1.1
+ Apple Mac OS X 10.1
+ Apple Mac OS X 10.1
+ Apple Mac OS X 10.0.4
+ Apple Mac OS X 10.0.3
+ Apple Mac OS X 10.0.2
+ Apple Mac OS X 10.0.1
+ Apple Mac OS X 10.0
+ Debian Linux 3.0 sparc
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 alpha
 + MandrakeSoft Multi Network Firewall 2.0
+ MandrakeSoft Single Network Firewall 7.2
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
PHP PHP 4.1.1
PHP PHP 4.1 .0
+ SuSE Linux 8.0 i386
 + SuSE Linux 8.0
PHP PHP 4.0.7
PHP PHP 4.0.6
+ Caldera OpenLinux Server 3.1.1
+ Caldera OpenLinux Server 3.1
+ Caldera OpenLinux Workstation 3.1.1
+ Caldera OpenLinux Workstation 3.1
+ HP Secure OS software for Linux 1.0
- IBM AIX 4.3.3
- IBM AIX 4.3.2
- IBM AIX 4.3.1
- IBM AIX 4.3
- IBM AIX 5.1
 + MandrakeSoft Corporate Server 1.0.1
+ Mandriva Linux Mandrake 8.1 ia64
 + Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.0 ppc
 + Mandriva Linux Mandrake 8.0
+ Mandriva Linux Mandrake 7.2
+ Mandriva Linux Mandrake 7.1
+ Redhat Linux 7.2 ia64
 + Redhat Linux 7.2 i386
 + Redhat Linux 7.2
+ Redhat Linux 7.1 ia64
 + Redhat Linux 7.1 i386
 + Redhat Linux 7.1 alpha
 + Redhat Linux 7.1
+ Redhat Linux 7.0 i386
 + Redhat Linux 7.0 alpha
 + Redhat Linux 7.0
+ Sun Cobalt RaQ 550
+ Sun LX50
+ SuSE Linux 7.3 sparc
 + SuSE Linux 7.3 ppc
 + SuSE Linux 7.3 i386
 + SuSE Linux 7.3
+ SuSE Linux 7.2 i386
 + SuSE Linux 7.2
+ Trustix Secure Linux 1.5
PHP PHP 4.0.5
PHP PHP 4.0.4
+ Compaq Compaq Secure Web Server PHP 1.0
+ Guardian Digital Engarde Secure Linux 1.0.1
+ SuSE Linux 7.2
+ SuSE Linux 7.1 x86
 + SuSE Linux 7.1 sparc
 + SuSE Linux 7.1 ppc
 + SuSE Linux 7.1 alpha
 + SuSE Linux 7.1
+ SuSE Linux 7.0 sparc
 + SuSE Linux 7.0 ppc
 + SuSE Linux 7.0 i386
 + SuSE Linux 7.0 alpha
 + SuSE Linux 7.0
PHP PHP 4.0.3
+ Debian Linux 2.2 sparc
 + Debian Linux 2.2 powerpc
 + Debian Linux 2.2 IA-32
 + Debian Linux 2.2 arm
 + Debian Linux 2.2 alpha
 + Debian Linux 2.2 68k
 + Debian Linux 2.2
+ Sun Cobalt Control Station 4100CS
+ Sun Cobalt Qube3 Japanese 4000WGJ
+ Sun Cobalt Qube3 Japanese w/ Caching and RAID 4100WGJ
+ Sun Cobalt Qube3 Japanese w/Caching 4010WGJ
+ Sun Cobalt RaQ XTR 3500R
+ Sun Cobalt RaQ XTR Japanese 3500R-ja
PHP PHP 4.0.2
PHP PHP 4.0.1
+ Sun Cobalt Qube3 4000WG
+ Sun Cobalt Qube3 w/ Caching and RAID 4100WG
+ Sun Cobalt Qube3 w/Caching 4010WG
+ Sun Cobalt RaQ4 3001R
+ Sun Cobalt RaQ4 Japanese RAID 3100R-ja
+ Sun Cobalt RaQ4 RAID 3100R
PHP PHP 4.0 0
HP HP-UX B.11.23
HP HP-UX B.11.22
HP HP-UX B.11.11
HP HP-UX B.11.11
HP HP-UX B.11.00
Avaya S8700 R2.0.1
Avaya S8700 R2.0.0
Avaya S8500 R2.0.1
Avaya S8500 R2.0.0
Avaya S8300 R2.0.1
Avaya S8300 R2.0.0
Avaya Integrated Management
Avaya Converged Communications Server 2.0
Apple Mac OS X Server 10.3.7
Apple Mac OS X Server 10.3.6
Apple Mac OS X Server 10.3.5
Apple Mac OS X Server 10.3.4
Apple Mac OS X Server 10.3.3
Apple Mac OS X Server 10.3.2
Apple Mac OS X Server 10.3.1
Apple Mac OS X Server 10.3
Apple Mac OS X Server 10.2.8
Apple Mac OS X Server 10.2.7
Apple Mac OS X Server 10.2.6
Apple Mac OS X Server 10.2.5
Apple Mac OS X Server 10.2.4
Apple Mac OS X Server 10.2.3
Apple Mac OS X Server 10.2.2
Apple Mac OS X Server 10.2.1
Apple Mac OS X Server 10.2
Apple Mac OS X Server 10.1.5
Apple Mac OS X Server 10.1.4
Apple Mac OS X Server 10.1.3
Apple Mac OS X Server 10.1.2
Apple Mac OS X Server 10.1.1
Apple Mac OS X Server 10.1
Apple Mac OS X Server 10.0
Apple Mac OS X 10.3.7
Apple Mac OS X 10.3.6
Apple Mac OS X 10.3.5
Apple Mac OS X 10.3.4
Apple Mac OS X 10.3.3
Apple Mac OS X 10.3.2
Apple Mac OS X 10.3.1
Apple Mac OS X 10.3
Apple Mac OS X 10.2.8
Apple Mac OS X 10.2.7
Apple Mac OS X 10.2.6
Apple Mac OS X 10.2.5
Apple Mac OS X 10.2.4
Apple Mac OS X 10.2.3
Apple Mac OS X 10.2.2
Apple Mac OS X 10.2.1
Apple Mac OS X 10.2
Apple Mac OS X 10.1.5
Apple Mac OS X 10.1.4
Apple Mac OS X 10.1.3
Apple Mac OS X 10.1.2
Apple Mac OS X 10.1.1
Apple Mac OS X 10.1
Apple Mac OS X 10.1
Apple Mac OS X 10.0.4
Apple Mac OS X 10.0.3
Apple Mac OS X 10.0.2
Apple Mac OS X 10.0.1
Apple Mac OS X 10.0 3
Apple Mac OS X 10.0
Not Vulnerable: Apple Mac OS X Server 10.3.8
Apple Mac OS X 10.3.8

Discussion

PHP Strip_Tags() Function Bypass Vulnerability

It is reported that it is possible to bypass PHPs strip_tags() function.

It is reported that under certain circumstances, PHPs strip_tags() function will improperly leave malformed tags in place.

This vulnerability may mean that previously presumed-safe web applications could contain multiple cross-site scripting and HTML injection vulnerabilities when viewed by Microsoft Internet Explorer or Apple Safari web browsers.

It is reported that 'magic_quotes_gpc' must be off for PHP to be vulnerable to this issue.

Exploit / POC

PHP Strip_Tags() Function Bypass Vulnerability

No exploit is required, but an example was provided.

If a web application uses strip_tags() similar to:
$example = strip_tags($_REQUEST['user_input'], "&lt;b&gt;&lt;i&gt;&lt;s&gt;");

Then possible tags that may lead to exploitation might be:
&lt;\0script&gt; or &lt;s\0cript&gt;

Solution / Fix

PHP Strip_Tags() Function Bypass Vulnerability

Solution:
Slackware has released an advisory (SSA:2005-095-01) including updated packages to address this issue. Please see the referenced advisory for more information.

Redhat has released an advisory (FEDORA-2004-223) and fixes addressing this issue for Fedora Core 2. Please see the referenced advisory for further details regarding obtaining and applying appropriate fixes.

Redhat has released an advisory (FEDORA-2004-222) and fixes addressing this issue for Fedora Core 1. Please see the referenced advisory for further details regarding obtaining and applying appropriate fixes.

Avaya has released an updated advisory that acknowledges this vulnerability for Avaya products. Some fixes are not currently available; customers are advised to contact the vendor for further details regarding fix availability. Please see the referenced Avaya advisory at the following location for further details:
http://support.avaya.com/japple/css/japple?temp.groupID=128450&temp.selectedFamily=128451&temp.selectedProduct=154235&temp.selectedBucket=126655&temp.feedbackState=askForFeedback&temp.documentID=198054&PAGE=avaya.css.CSSLvl1Detail&executeTransaction=avaya.css.UsageUpdate()

TinySofa Linux has released advisory TSSA-2004-013 along with fixes dealing with this issue. Please see the referenced advisory for more information.

Mandrake Linux has released advisory MDKSA-2004:068 along with fixes dealing with this and other issues. Please see the referenced advisory for more information.

Gentoo Linux has released advisory GLSA 200407-13 dealing with this and other issues. All PHP, mod_php and php-cgi users should upgrade to the latest stable
version:

# emerge sync

# emerge -pv ">=dev-php/php-4.3.8"
# emerge ">=dev-php/php-4.3.8"

# emerge -pv ">=dev-php/mod_php-4.3.8"
# emerge ">=dev-php/mod_php-4.3.8"

# emerge -pv ">=dev-php/php-cgi-4.3.8"
# emerge ">=dev-php/php-cgi-4.3.8"

For more information please see the referenced Gentoo Linux advisory.

SuSE Linux has released an advisory (SUSE-SA:2004:021) along with fixes dealing with this issue. Please see the referenced advisory for more information.

Conectiva Linux has released an announcement (CLSA-2004:847) dealing with this and other issues. Please see the referenced advisory for more information.

Red Hat has released advisory RHSA-2004:395-10 and fixes to address this issue on Red Hat Linux Enterprise platforms. Customers who are affected by this issue are advised to apply the appropriate updates. Customers subscribed to the Red Hat Network may apply the appropriate fixes using the Red Hat Update Agent (up2date). Please see referenced advisory for additional information.

Debian has released advisory DSA 531-1 dealing with this and other issues. Please see the referenced advisory for more information.

OpenPKG has released advisory OpenPKG-SA-2004.034 dealing with this and other issues. Please see the referenced advisory for further information.

RedHat has released an advisory (RHSA-2004:405-06) to address various issues in Stronghold. Updated Stronghold 4 packages have been released. RedHat users are advised to upgrade their computers by carrying out the following command to launch the update agent service:

bin/agent

Please see the RedHat advisory in web references for more information.

Trustix Secure Linux has released advisory TSL-2004-0039 to address this, and other issues. Please see the referenced advisory for further information.

Hewlett-Packard has released advisory HPSBUX01064 along with a resolution dealing with this issue. Please see the referenced advisory for more information.

TurboLinux has released advisory TLSA-2004-23 along with fixes dealing with this issue. Please see the referenced advisory for more information.

Apple Computers has released advisory APPLE-SA-2005-01-25 along with a security update dealing with this and other issues. Please see the referenced advisory for more information.

Debian Linux has released an advisory (DSA 669-1) dealing with this issue. Please see the reference section for more information.

Apple Computers has released Mac OS X version 10.3.8 dealing with this issue. This upgrade includes the security patches shipped with the referenced security update.

Red Hat has released advisory RHSA-2005:816-10 to address this issue for Red Hat Stronghold for Enterprise Linux. Please see the referenced advisory for further information on obtaining fixes.


HP HP-UX B.11.11

HP HP-UX B.11.22

HP HP-UX B.11.23

Apple Mac OS X 10.2.8

PHP PHP 4.0.6

PHP PHP 4.1 .0

PHP PHP 4.1.2

PHP PHP 4.2.1

PHP PHP 4.2.2

PHP PHP 4.2.3

PHP PHP 4.3.1

PHP PHP 4.3.3

PHP PHP 4.3.6

References

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