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"Invalid UTF8 Encoding" entries appear in DPI events

    • Updated:
    • 6 Oct 2015
    • Product/Version:
    • Deep Security 8.0
    • Deep Security 9.0
    • Deep Security 9.5
    • Deep Security 9.6
    • Deep Security as a Service 2.0
    • Platform:
    • Unix - Solaris (Sun) version 10 (SunOS 5.10)
    • Unix - Solaris (Sun) version 8 (SunOS 5.8)
    • Unix - Solaris (Sun) version 9 (SunOS 5.9)
    • Windows 2000 Professional
    • Windows 2003 Standard Server Edition
    • Windows 2008 Standard Server Edition
    • Windows Vista 32-bit
    • Windows XP Home
Summary

By default, Deep Security is configured for UTF-8 encoding in HTTP request. Deep Security expects extended ASCII characters, such as é, to be encoded by the user’s browser as "%C3%A9". However, some applications may use a different encoding type and encode é as "%82".

Details
Public

If your logs show 'Invalid UTF8 Encoding' events for what appear to be legitimate traffic, you may need to change your encoding type in Deep Security:

  1. Open the properties of the Security Profile used by the host triggering the events (or Host properties, if your filters are assigned directly to the host).
  2. Open the DPI Rules section of the profile.
  3. Open the properties of the HTTP Protocol Decoder filter.
  4. Go to the Configuration tab and then select the Latin-1 encoding option.
  5. Click OK.

Once the Agent receives the update, Deep Security will allow encodings of this type to pass through the application.

Premium
Internal
Rating:
Category:
Configure
Solution Id:
1054549
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