Trustwave Unveils New Offerings to Maximize Value of Microsoft Security Investments. Learn More

Request a Demo
Trustwave Unveils New Offerings to Maximize Value of Microsoft Security Investments. Learn More

Request a Demo
Services
Capture
Managed Detection & Response

Eliminate active threats with 24/7 threat detection, investigation, and response.

twi-managed-portal-color
Co-Managed SOC (SIEM)

Maximize your SIEM investment, stop alert fatigue, and enhance your team with hybrid security operations support.

twi-briefcase-color-svg
Advisory & Diagnostics

Advance your cybersecurity program and get expert guidance where you need it most.

tw-laptop-data
Penetration Testing

Test your physical locations and IT infrastructure to shore up weaknesses before exploitation.

twi-database-color-svg
Database Security

Prevent unauthorized access and exceed compliance requirements.

twi-email-color-svg
Email Security

Stop email threats others miss and secure your organization against the #1 ransomware attack vector.

tw-officer
Digital Forensics & Incident Response

Prepare for the inevitable with 24/7 global breach response in-region and available on-site.

tw-network
Firewall & Technology Management

Mitigate risk of a cyberattack with 24/7 incident and health monitoring and the latest threat intelligence.

View All Trustwave Services
Solutions
BY INDUSTRY
BY REGULATION
BY TOPIC
Offensive Security
Solutions to maximize your security ROI
Microsoft Exchange Server Attacks
Stay protected against emerging threats
Rapidly Secure New Environments
Security for rapid response situations
Securing the Cloud
Safely navigate and stay protected
Securing the IoT Landscape
Test, monitor and secure network objects
Why Trustwave
About Us
We reduce cyber risk and fortify organizations
Awards and Accolades
Recognition by analysts and media outlets
Trustwave SpiderLabs Team
Global researchers, ethical hackers, and responders
Trustwave Fusion Security Operations Platform
Unprecedented security visibility and control
Trustwave Security Colony
Access to cybersecurity threat protection resources
Partners
Technology Alliance Partners
Key alliances who align and support our ecosystem of security offerings
Trustwave PartnerOne Program
Join forces with Trustwave to protect against the most advance cybersecurity threats
Register
Login
Resources
BLOGS
UPCOMING
MEDIA & ASSETS
NOTICES
HELP
Loading...
Loading...

Trustwave 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: 0.047. 13 queries. Compression Disabled.
    Powered by InstantKB.NET