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Installation Path Disclosure Weakness in SPIP

Advisory ID:HTB23052
Product:SPIP
Vendor:www.spip.net
Vulnerable Versions:2.1.11 and probably prior
Tested Version:2.1.11
Advisory Publication:October 5, 2011 [without technical details]
Vendor Notification:October 5, 2011
Public Disclosure:October 26, 2011
Latest Update:October 12, 2011
Vulnerability Type:Information Exposure Through Externally-generated Error Message [CWE-211]
Risk Level:Medium
CVSSv2 Base Score:5.0 (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered a weakness in SPIP which could be exploited to gain access to potentially sensitive information.

1) Installation path disclosure weakness in SPIP
The weakness exists due to application reveals the full path to installation directory in an error message. A remote attacker can directly access scripts within the /extensions/ directory and gain knowledge of the web root directory and other potentially sensitive information.
Successful exploitation requires that php_display_errors variable is enabled.
Exploitation examples:
http://[host]/extensions/filtres_images/filtres/couleurs.php
http://[host]/extensions/filtres_images/filtres/images_lib.php
http://[host]/extensions/filtres_images/filtres/images_transforme.php
http://[host]/extensions/filtres_images/filtres/images_typo.php
http://[host]/extensions/filtres_images/inc/filtres_images.php
http://[host]/extensions/filtres_images/tests/couleur_extraire.php
http://[host]/extensions/filtres_images/tests/multiple_de_trois.php
http://[host]/extensions/filtres_images/tests/_couleur_hsl2rgb.php
http://[host]/extensions/filtres_images/tests/_couleur_hsv2rgb.php
http://[host]/extensions/filtres_images/tests/_couleur_rgb2hsl.php
http://[host]/extensions/filtres_images/tests/_couleur_rgb2hsv.php
http://[host]/extensions/porte_plume/inc/barre_outils.php

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Solution:
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References:
[1] High-Tech Bridge Advisory HTB23052 - https://www.immuniweb.com/advisory/HTB23052 - Installation Path Disclosure Weakness in SPIP
[2] SPIP - www.spip.net – SPIP is a free software content management system designed for Web site publishing
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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