ActiveWeb Contentserver CMS Clientside Filtering of Page Editor Content
RedTeam Pentesting discovered a design vulnerability in the page editor
of the activeWeb contentserver CMS during a penetration test. Filtering
on the client side. By manipulating the POST request, the filtering can
Product: activeWeb contentserver
Affected Versions: <= 5.6.2929
Fixed Versions: 5.6.2964
Vulnerability Type: Design Flaw
Vendor-Status: informed, fixed version released
contentserver is the comprehensive, scalable Content Management System
for professional requirements. It combines editorial system, website
management and development platform for web applications in one package.
(translation of the description on the vendor's homepage)
The contentserver CMS provides a WYSIWYG (What You See Is What You Get)
editor to edit articles in the browser. The editor is realised as a Java
filters any script tags.
When clicking the "save" icon, a POST request to
returned to the Java applet with the hint that script tags were removed.
But, if the next POST request is manipulated, which goes to the script
of the applet.
The vulnerability is fixed in release 5.6.2964.
malicious intent can use this to exploit any viewers accessing the
interface when viewing the article preview or editing the article. This
means that an attacker may be able to steal the session cookie of other
editors. The risk of this vulnerability is considered medium, as editors
are normally considered trustworthy.
2007-05-23 Problem found during a penetration test
2007-05-30 Vendor notified by customer
2007-06-01 Vendor called back to discuss next steps and to announce
2007-06-29 Vendor confirmed the vulnerability
2007-06-29 CVE number assigned
2007-07-11 Vendor released fixed version
2007-07-13 Advisory released
2009-05-08 Updated Advisory URL
The vendor was very cooperative. There was always a competent contact
person available who answered any questions.
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