Stack Trace Disclosure (ASP.NET)

Summary

Netsparker identified a stack trace disclosure (ASP.NET) in the target web server's HTTP response.

Impact

An attacker can obtain information such as:

ASP.NET version.
Physical file path of temporary ASP.NET files.
Information about the generated exception and possibly source code, SQL queries, etc.

This information might help an attacker gain more information and potentially focus on the development of further attacks for the target system.

Remediation

Apply following changes on your web.config file to prevent information leakage by applying custom error pages.

<System.Web>
     <customErrors mode="On" defaultRedirect="~/error/GeneralError.aspx">
          <error statusCode="403" redirect="~/error/Forbidden.aspx" />
          <error statusCode="404" redirect="~/error/PageNotFound.aspx" />
          <error statusCode="500" redirect="~/error/InternalError.aspx" />
     </customErrors>
</System.Web>

Classifications

PCI v3.1-6.5.5, PCI v3.2-6.5.5, CAPEC-214, WASC-14, OWASP 2013-A5

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