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| | phpBB Input Validation Flaws in 'admin_smilies.php' and 'admin_styles.php' Let Remote Authenticated Administrators Inject SQL |
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Categorie: Vulnerability
Posted: 2004-03-24 by ReCall
Views: 398
Source: Click here
| Current Rating: Not rated
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| | Details |
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Description: Some input validation vulnerabilities were reported in phpBB. A remote authenticated administrator can inject SQL commands. A remote user can conduct cross-site scripting attacks.
JeiAr of the GulfTech Security Research Team reported that the 'admin_smilies.php' and 'admin_styles.php' scripts do not properly validate user-supplied information in the 'id' parameter. A demonstration exploit URL is provided:
admin_smilies.php?mode=edit&id=99 UNION SELECT 0,username,0,user_password FROM othersite_phpbb_users WHERE user_id=2
It is also possible for a remote user to conduct cross-site scripting attacks, the report said. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the phpBB software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Some additional examples are provided:
admin_smilies.php?mode=edit&id=[SQL]
admin_ smilies.php?mode=delete&id=[SQL]
admin_smilies.php?mode=edit&id=[XSS]
admin_smilies.php?mode=delete&id=[XSS]
admin_styles.php?mode=edit&style_id=[SQL]
admin_styles.ph p?mode=delete&style_id=[SQL]
admin_styles.php?mode=edit&style_id=[XSS]
admin_styles.php?mode=delete&style_id=[XSS]
It is reported that many scripts do not properly check session IDs. As a result, a remote user can exploit one of the cross-site scripting flaws to inject phpBB commands in a message post that will be executed by the target user when the message post is viewed by the target user.
The vendor has reportedly been notified. The author of the report has posted excerpts from e-mail exchanges with the vendor at:
http://www.gulftech.org/vuln/phpBBEmail.txt
Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the
site running the phpBB software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
A remote authenticated administrator can execute SQL commands on the underlying database.
Solution: No solution was available at the time of this entry. The author of the report has created an unofficial patch, available
at:
http://www.gulftech.org/vuln/phpBBadminFix.rar
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