F5 FirePass SSL VPN 4xxx Series | Arbitrary URL Redirection

By YGN Ethical Hacker Group -
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
OWASP Top 10 2010 - A 10:
http://www.owasp.org/index.php/Top_10_2010-A10-Unvalidated_Redirects_and_Forwards
SANS Top 25 - Rank 23: http://cwe.mitre.org/top25/#CWE-601
CWE-601: http://cwe.mitre.org/data/definitions/601.html

#yehg [2012-10-20]


---------------------------------
Best regards,
YGN Ethical Hacker Group
Yangon, Myanmar
http://yehg.net
Our Lab | http://yehg.net/lab
Our Directory | http://yehg.net/hwd

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