Vulnerability CVE-2011-3140
Published: 2011-08-15   Modified: 2012-02-13

Description:
IBM Web Application Firewall, as used on the G400 IPS-G400-IB-1 and GX4004 IPS-GX4004-IB-2 appliances with update 31.030, does not properly handle query strings with multiple instances of the same parameter, which allows remote attackers to bypass intended intrusion prevention by dividing a dangerous parameter value into substrings, as demonstrated by a SQL statement that is split across multiple iid parameters and then sent to a .aspx file on an IIS web server.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
IBM Web Application Firewall Bypass
Trustwave Adviso...
16.08.2011

Type:

CWE-264

 (Permissions, Privileges, and Access Controls)

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
IBM -> Web application firewall 
IBM -> G400 ips-g400-ib-1 appliance 
IBM -> Gx4004 ips-gx4004-ib-2 appliance 

 References:
http://securityreason.com/securityalert/8339
http://securitytracker.com/id?1025683
http://www.iss.net/security_center/reference/vuln/HTTP_Parameter_Abuse.htm
http://www.securityfocus.com/archive/1/518556/100/0/threaded
http://www.securityfocus.com/bid/48370
https://exchange.xforce.ibmcloud.com/vulnerabilities/67178
https://www.trustwave.com/spiderlabs/advisories/TWSL2011-006.txt
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