PHP cURL Open_Basedir Restriction Bypass Vulnerability

BID:11557

Info

PHP cURL Open_Basedir Restriction Bypass Vulnerability

Bugtraq ID: 11557
Class: Access Validation Error
CVE: CVE-2004-1392
Remote: Yes
Local: No
Published: Oct 28 2004 12:00AM
Updated: Jul 12 2009 08:06AM
Credit: FraMe <[email protected]> disclosed this vulnerability.
Vulnerable: Ubuntu Ubuntu Linux 4.1 ppc
Ubuntu Ubuntu Linux 4.1 ia64
Ubuntu Ubuntu Linux 4.1 ia32
SGI ProPack 3.0
Redhat Linux 9.0 i386
Redhat Linux 7.3 i386
Redhat Fedora Core1
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 4.3.8
+ Mandriva Linux Mandrake 10.1 x86_64
 + Mandriva Linux Mandrake 10.1
+ S.u.S.E. Linux Personal 9.2
+ Turbolinux Turbolinux Server 10.0
+ Ubuntu Ubuntu Linux 4.1 ppc
 + Ubuntu Ubuntu Linux 4.1 ia64
 + Ubuntu Ubuntu Linux 4.1 ia32
 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
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 4.2 -dev
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 RC3
PHP PHP 4.0.7 RC2
PHP PHP 4.0.7 RC1
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 pl1
+ SuSE Linux 6.4 ppc
 + SuSE Linux 6.4 i386
 + SuSE Linux 6.4 alpha
 + SuSE Linux 6.4
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 pl2
PHP PHP 4.0.1 pl1
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
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 Modular Messaging (MSS) 2.0
Avaya Modular Messaging (MSS) 1.1
Avaya MN100
Avaya Intuity LX
Avaya Converged Communications Server 2.0
Not Vulnerable:

Discussion

PHP cURL Open_Basedir Restriction Bypass Vulnerability

It is reported that cURL allows malicious users to bypass 'open_basedir' restrictions in PHP scripts. This issue is due to a failure of the cURL module to properly enforce PHPs 'open_basedir' restriction.

Users with the ability to create or modify PHP scripts on a server computer hosting the vulnerable software can reportedly exploit this vulnerability to bypass the 'open_basedir' restriction, and access arbitrary files with the privileges of the web server. This may aid them in further attacks.

This vulnerability possibly results in a false sense of security, as administrators expect that the restrictions in place prevent malicious users from gaining access to sensitive information.

Exploit / POC

PHP cURL Open_Basedir Restriction Bypass Vulnerability

An exploit is not required. An example PHP script containing cURL functions sufficient to read arbitrary files was provided:

&lt;?php
$ch = curl_init("file:///etc/parla");
$file=curl_exec($ch);
echo $file
?&gt;

Solution / Fix

PHP cURL Open_Basedir Restriction Bypass Vulnerability

Solution:
Avaya has released an advisory (ASA-2005-136) that acknowledges this vulnerability for Avaya products. Please see the referenced Avaya advisory for further details.

Conectiva has released an advisory (CLSA-2005:955) and fixes to address this and other issues. Please see the referenced advisory for further information regarding obtaining and applying appropriate updates.

Ubuntu Linux has released advisory USN-66-1 to address this, and other issues. Please see the referenced advisory for further information.

Ubuntu has released advisory USN-66-2 to release new fixes for this issue. The fixes included in the previous Ubuntu advisory USN-66-1 still allow for some variants of this issue to occur. Please see the referenced advisory for more information.

Fedora has released Fedora Legacy advisory FLSA:2344 to address various issues in Red Hat Linux 7.3, Red Hat Linux 9.0 and Fedora Core 1 for the i386 architecture. Please see the referenced advisory for more information.

Red Hat released advisory RHSA-2005:405-06 as well as fixes to address this and other issues 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 advisories for additional information.

SGI has released an advisory 20050501-01-U including updated SGI ProPack 3
Service Pack 5 packages to address this BID and other issues. Please see
the referenced advisory for more information.


PHP PHP 4.1.2

PHP PHP 4.2.2

PHP PHP 4.3.3

PHP PHP 4.3.8

References

PHP cURL Open_Basedir Restriction Bypass Vulnerability

References:

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