Vulnerability CVE-2001-0669
Published: 2001-10-30   Modified: 2012-02-12

Description:
Various Intrusion Detection Systems (IDS) including (1) Cisco Secure Intrusion Detection System, (2) Cisco Catalyst 6000 Intrusion Detection System Module, (3) Dragon Sensor 4.x, (4) Snort before 1.8.1, (5) ISS RealSecure Network Sensor 5.x and 6.x before XPU 3.2, and (6) ISS RealSecure Server Sensor 5.5 and 6.0 for Windows, allow remote attackers to evade detection of HTTP attacks via non-standard "%u" Unicode encoding of ASCII characters in the requested URL.

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Snort -> Snort 
ISS -> Realsecure network sensor 
ISS -> Realsecure server sensor 
Enterasys -> Dragon 
Cisco -> Catalyst 6000 intrusion detection system module 
Cisco -> Secure intrusion detection system 

 References:
http://marc.info/?l=bugtraq&m=99972950200602&w=2
http://www.cisco.com/warp/public/707/cisco-intrusion-detection-obfuscation-vuln-pub.shtml
http://www.kb.cert.org/vuls/id/548515
http://www.securityfocus.com/bid/3292
http://xforce.iss.net/alerts/advise95.php
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