======================================================================== 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, 126.96.36.19982.
- non-X-Family device (not including 600E, 1200E,
2400E or 5000E), 188.8.131.5226.
- non-X-Family device (including 600E, 1200E, 2400E
or 5000E), 184.108.40.20619.
== Credit =
Discovered and advised to Tippingpoint January 18th 2006
by Paul Craig of Security-Assessment.com
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