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Category:   Device (Router/Bridge/Hub)  >   F5 FirePass Vendors:   F5 Networks
F5 FirePass SSL VPN Input Validation Flaw Permits Cross-Site URL Redirection Attacks
SecurityTracker Alert ID:  1027688
SecurityTracker URL:  http://securitytracker.com/id/1027688
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Oct 22 2012
Impact:   Modification of user information
Exploit Included:  Yes  
Version(s): SSL VPN 4xxx Series
Description:   A vulnerability was reported in F5 FirePass SSL VPN. A remote user can conduct cross-site URL redirection attacks.

A remote user can create a specially crafted URL that, when loaded by a target user, will cause the target user's browser to be redirected to an arbitrary URL.

The 'refreshURL' parameter of 'my.activation.cns.php3' is affected.

A demonstration exploit URL is provided:

https://[target]/my.activation.cns.php3?langchar=&ui_translation=&refreshURL=http://[arbitrary site]/

The vendor was notified on March 31, 2012.

Aung Khant, YGN Ethical Hacker Group, Myanmar, reported this vulnerability.

Impact:   A remote user can cause the target user's browser to be redirected to an arbitrary URL.
Solution:   No solution was available at the time of this entry.
Vendor URL:  f5.com/ (Links to External Site)
Cause:   Input validation error

Message History:   None.


 Source Message Contents

Subject:  [Full-disclosure] F5 FirePass SSL VPN 4xxx Series | Arbitrary URL Redirection

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 be 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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