exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

GS07-01.txt

GS07-01.txt
Posted May 17, 2007
Authored by Fatih Ozavci, Caglar Cakici | Site gamasec.net

Various HTTP content scanning systems fail to properly scan full-width/half-width Unicode encoded traffic. This may allow malicious content to bypass HTTP content scanning systems. Systems affected include Checkpoint Web Intelligence and IBM ISS Proventia Series systems.

tags | advisory, web
SHA-256 | ed7d99c4b0c8cf924026804e5a72dd264e34e794211f2f18d66d3c41fdd46077

GS07-01.txt

Change Mirror Download

GS07-01 Full-Width and Half-Width Unicode Encoding IDS/IPS/WAF Bypass
Vulnerability

Date & Version : 04/14/2007 - 1.0

Description :

Various HTTP content scanning systems fail to properly scan
full-width/half-width Unicode encoded traffic. This may allow malicious
content to bypass HTTP content scanning systems.

HTTP Content Scanning Systems have a pre-processor to decode various
forms of HTTP encoded requests such as UTF encoding for attack signature
analysis. Full-width and half-width is an encoding technique for Unicode
characters. Various HTTP content scanning systems fail to properly scan
full-width/half-width Unicode encoded traffic.

Some Open Source or Microsoft Products such as Microsoft ISS and .NET
Framework properly decode this type of encoding. But most IDS/IPS/WAF
products does not properly decode full-width Unicode (%uff) encoded HTTP
requests for analysis, Lowercase/Uppercase conversion and character
matching. By sending HTTP traffic to a vulnerable content scanning
system, an attacker may be able to bypass the content scanning system.

Risk Level : High

Impact : Security Bypass

Systems Affected :

Checkpoint Web Intelligence (Confirmed)
IBM ISS Proventia Series (Confirmed)
Full List of Vendors : (CERT - Vulnerability Note VU#739224) [1]

Remedy :

Contact your vendor for a hotfix, patch or advanced configuration.

Credits :

Fatih Ozavci (GamaTEAM Member)
Caglar Cakici (GamaTEAM Member)
It's detected using GamaSEC Exploit Framework
GamaSEC Information Security Audit and Consulting Services
(www.gamasec.net)

Original Advisory Link :
http://www.gamasec.net/english/gs07-01.html

References :

1. CERT - Vulnerability Note VU#739224
http://www.kb.cert.org/vuls/id/739224

2. Unicode Home Page
http://unicode.org

3. Unicode.org, Halfwidth and Fullwidth Forms
http://www.unicode.org/charts/PDF/UFF00.pdf


--
Best Regards
Fatih Ozavci
IT Security Consultant
Login or Register to add favorites

File Archive:

September 2022

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Sep 1st
    23 Files
  • 2
    Sep 2nd
    12 Files
  • 3
    Sep 3rd
    0 Files
  • 4
    Sep 4th
    0 Files
  • 5
    Sep 5th
    10 Files
  • 6
    Sep 6th
    8 Files
  • 7
    Sep 7th
    30 Files
  • 8
    Sep 8th
    14 Files
  • 9
    Sep 9th
    26 Files
  • 10
    Sep 10th
    0 Files
  • 11
    Sep 11th
    0 Files
  • 12
    Sep 12th
    5 Files
  • 13
    Sep 13th
    28 Files
  • 14
    Sep 14th
    15 Files
  • 15
    Sep 15th
    17 Files
  • 16
    Sep 16th
    9 Files
  • 17
    Sep 17th
    0 Files
  • 18
    Sep 18th
    0 Files
  • 19
    Sep 19th
    12 Files
  • 20
    Sep 20th
    15 Files
  • 21
    Sep 21st
    20 Files
  • 22
    Sep 22nd
    13 Files
  • 23
    Sep 23rd
    12 Files
  • 24
    Sep 24th
    0 Files
  • 25
    Sep 25th
    0 Files
  • 26
    Sep 26th
    30 Files
  • 27
    Sep 27th
    27 Files
  • 28
    Sep 28th
    0 Files
  • 29
    Sep 29th
    0 Files
  • 30
    Sep 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Hosting By
Rokasec
close