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F5 FirePass SSL VPN  4xxx Series | Arbitrary URL Redirection
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1. OVERVIEW

F5 FirePass SSL VPN is vulnerable to Open URL Redirection.


2. BACKGROUND

F5 FirePass SSL VPN provides secure remote access to enterprise applications and data for users over any device or network while protecting your corporate. (See http://www.f5.com/pdf/products/firepass-overview.pdf)


3. VULNERABILITY DESCRIPTION

F5 FirePass SSL VPN contains a flaw that allows a remote cross site redirection attack. This flaw exists because the application does not validate the "refreshURL" parameter upon submission to the "my.activation.cns.php3" script. This could allow a user to create a specially crafted URL, that if clicked, would redirect a victim from the intended legitimate web site to an arbitrary web site of the attacker's choosing.


4. VERSIONS AFFECTED

4xxx Series


5. PROOF-OF-CONCEPT/EXPLOIT

https://[VPN_HOST]/my.activation.cns.php3?langchar=&ui_translation=&refreshURL=http://yehg.net/


6. SOLUTION

We have not been informed of the fix. 
We believe this issue should have been fixed by the time of releasing our advisory.


7. VENDOR

F5 Networks, Inc. 


8. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN Ethical Hacker Group, Myanmar.


9. DISCLOSURE TIME-LINE

2012-03-31: notified vendor
2012-04-04: vendor acknowledged
2012-10-20: vulnerability disclosed


10. REFERENCES

Original Advisory URL: http://yehg.net/lab/pr0js/advisories/%5BF5_firepass4x%5D_url_redirection
Vendor Advisory URL: http://support.f5.com/kb/en-us/solutions/public/13000/900/sol13993.html

#yehg [2012-10-20]