======================================================================== TippingPoint IPS Signature Evasion
= Vendor Website:
= Affected Version:
= TippingPoint IPS running TOS versions 2.1 & 2.2.0 - 2.2.4
= Vendor Notified. 18th January 2006
= Public Disclosure. 11th July 2007
== Overview =
During security analysis of the Tippingpoint IPS product a signature
evasion vulnerability was discovered. The use of specific Unicode characters
on particular web servers allows a remote user to bypass IPS detection.
== Exploitation =
By using a hex encoded alternate Unicode character for forward slash (/)
a request can be produced that will not match any IPS signature present
in the TippingPoint device.
http://www.test.com/scripts/cmd.exe is a known attack, and detected by a
The same URI with alternate Unicode forward slash characters are not
detected by the signature.
Web servers located behind a Tippingpoint IPS device which are capable
of decoding alternate Unicode characters can be accessed, and exploited
without triggering the IPS device.
== Solutions =
Security-Assessment.com has been in contact with Tipping and a new version
of the Tippingpoint IPS software has been released to address the
This issue has been addressed in various TOS releases as indicated
by the affected product below.
- X-Family devices, 184.108.40.20682.
- non-X-Family device (not including 600E, 1200E,
2400E or 5000E), 220.127.116.1126.
- non-X-Family device (including 600E, 1200E, 2400E
or 5000E), 18.104.22.16819.
== Credit =
Discovered and advised to Tippingpoint January 18th 2006
by Paul Craig of Security-Assessment.com
== About Security-Assessment.com =
Security-Assessment.com is Australasia's leading team of Information
Security consultants specialising in providing high quality Information
Security services to clients throughout the Asia Pacific region. Our
clients include some of the largest globally recognised companies in
areas such as finance, telecommunications, broadcasting, legal and
government. Our aim is to provide the very best independent advice
and a high level of technical expertise while creating long and lasting
professional relationships with our clients.
Security-Assessment.com is committed to security research and development,
and its team continues to identify and responsibly publish vulnerabilities
in public and private software vendor's products. Members of the
Security-Assessment.com R&D team are globally recognised through their
release of whitepapers and presentations related to new security research.
Security-Assessment.com is an Endorsed Commonwealth Government of Australia
supplier and sits on the Australian Government Attorney-General's Department
Critical Infrastructure Project panel. We are certified by both Visa and
MasterCard under their Payment Card Industry Data Security Standard