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.
References
- https://www.trustwave.com/spiderlabs/advisories/TWSL2011-006.txt
- https://exchange.xforce.ibmcloud.com/vulnerabilities/67178 vdb-entry
- 8339 third-party-advisory
- 48370 vdb-entry
- 20110621 TWSL2011-006: IBM Web Application Firewall Bypass mailing-list
- http://www.iss.net/security_center/reference/vuln/HTTP_Parameter_Abuse.htm
- 1025683 vdb-entry