LevelBlue Completes Acquisition of Cybereason.  Learn More

LevelBlue Completes Acquisition of Cybereason.  Learn More

Services
Cyber Advisory
Managed Cloud Security
Data Security
Managed Detection & Response
Email Security
Managed Network Infrastructure Security
Exposure Management
Security Operations Platforms
Incident Readiness & Response
SpiderLabs Threat Intelligence
View All Services
Solutions
BY INDUSTRY
BY REGULATION
BY TOPIC
Offensive Security
Solutions to maximize your security ROI
Operational Technology
End-to-end OT security
Microsoft Security
Unlock the full power of Microsoft Security
Securing the IoT Landscape
Test, monitor and secure network objects
Why LevelBlue
About Us
We reduce cyber risk and fortify organizations
Awards and Accolades
Recognition by analysts and media outlets
LevelBlue SpiderLabs
Global researchers, ethical hackers, and responders
LevelBlue Security Operations Platforms
Unprecedented security visibility and control
Security Colony
Access to cybersecurity threat protection resources
Partners
Microsoft Security
Unlock the full power of Microsoft Security
Technology Alliance Partners
Key alliances who align and support our ecosystem of security offerings
Register
Login
Resources
BLOGS
UPCOMING
MEDIA & ASSETS
NOTICES
HELP
Loading...
Loading...

LevelBlue Knowledge Base

Home » Knowledgebase » Legacy Products » Secure Web Gateway » ICAP » INFO: URL CGI parameters are malformed in ICAP with BlueCoat

INFO: URL CGI parameters are malformed in ICAP with BlueCoat

Expand / Collapse
Show/Hide Article Tools


  • Description
    Proxy chain with BlueCoat ICAP client and specific BlueCoat SGOS modifies URLs incorrectly.

  • Symptoms
    When special characters are used as a part of search item and/or serve as  part of url-cgi parameters, the resulting URLs may be wrong or malformed.

  • Cause
    This behavior occurs due to SGOS recursively percent-encoding the percent sign (%) in percent-encoded characters that are embedded in the URL. In other words, the percent sign in percent-encoded characters is replaced with "%25". For example, "%2B" (percent-encoded plus sign), will become "%252B"

    Lets review search query for "Finjan+Business" with the Google through this proxy chain:



    The search results for this query are as following:



    To find the modifications for URL parameters in this example review the network traffic:



    Packet #1128
    A client (10.194.150.155) issues a request to the BlueCoat (10.194.150.80) :
    HTTP GET  http://www.google.com/search?hl=en&q=Finjan%2BBusiness&btnG=Google+Search

    Packet #1130
    Blue Coat (10.194.150.80) modifies it and forwards a modified request to Finjan (10.194.150.117) :
    GET  http://www.google.com/search?hl=en&q=Finjan%252BBusiness&btnG=Google+Search

    Packet #1133
    Finjan (10.194.150.117) proceeds with the (wrong) request to the WebServer :
    HTTP GET  /search?hl=en&q=Finjan%2BBusiness&btnG=Google+Search

  • Solution
    This behavior occurs when Blue Coat is running SGOS 4.2.4.x series.
    Blue Coat technical support confirmed that this issue is scheduled to be resolved in SGOS 4.2.4.10 release.

    In several cases solution for this behavior is to wrap such special characters with the spaces:



    This search request is treated as expected :



    And these are the results :


  • Software Version
    N/A<

    • This article applies to:
    NG 1000
    NG 5000
    NG 6000
    NG 8000
    This article was previously published as:
    Finjan KB 1550

    To contact Trustwave about this article or to request support:

    Rate this Article:
         

    Add Your Comments


    Comment submission is disabled for anonymous users.
    Please send feedback to Trustwave Technical Support or the Webmaster    .


    Execution: 0.063. 8 queries. Compression Disabled.
    Powered by InstantKB.NET