Application Handling Error
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Error Handling Best Practices
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Error Handling Definition
Online Services Open Specifications patterns & practices Servers and Enterprise Development Speech Technologies Web Development Windows Desktop App Development TOC Collapse the table of content Expand the table of content This documentation is archived data error handling and is not being maintained. This documentation is archived and is not being maintained. How to: Handle Application-Level Errors Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 .NET Framework 3.0 Visual Studio 2005 This code example shows how to create an error handler in the Global.asax file that will catch all unhandled ASP.NET errors while processing a request — in other words, all the errors that are error handling techniques not caught with a Try/Catch block or in a page-level error handler. In the example, the handler transfers control to a generic error page named GenericErrorPage.aspx, which interprets the error and displays an appropriate message. Example The following example is from a complete code sample in Complete Example for Error Handlers. Security Note Never set customErrors to Off in your Web.config file if you do not have an Application_Error handler in your Global.asax file. Potentially compromising information about your Web site can be exposed to anyone who can cause an error to occur on your site. C#VB Copy void Application_Error(object sender, EventArgs e) { // Code that runs when an unhandled error occurs // Get the exception object. Exception exc = Server.GetLastError(); // Handle HTTP errors if (exc.GetType() == typeof(HttpException)) { // The Complete Error Handling Example generates // some errors using URLs with "NoCatch" in them; // ignore these here to simulate what would happen // if a global.asax handler were not implemented. if (exc.Message.Contains("NoCatch") || exc.Message.Contains("maxUrlLength")) return; //Redirect HTTP errors to HttpError page Server.Transfer("HttpErrorPage.aspx"); } // For other kinds of errors give the user some information // but stay on the default page Response.Write("
Global Page Error
\n"); Response.Write( "" + exc.Message + "
\n"); Response.Write("Return to theDebug errors 6.3 Exception handling 6.4 Functional return values 7 Detailed error messages 7.1 How to determine if you are vulnerable 7.2 How to protect yourself 8 Logging 8.1 Where to log to? 8.2 Handling 8.3 General Debugging 8.4 Forensics evidence 8.5
Application Logging Best Practices C#
Attack detection 8.6 Quality of service 8.7 Proof of validity 8.8 Logging types 9 Noise asp.net error handling best practices 9.1 How to protect yourself 10 Cover Tracks 10.1 How to protect yourself 11 False Alarms 11.1 How to protect yourself 11.2 Denial of
Application Error Disclosure Zap
Service 11.3 How to protect yourself 12 Destruction 12.1 How to protect yourself 13 Audit Trails 13.1 How to determine if you are vulnerable 13.2 How to protect yourself 14 Further Reading 15 Error Handling and Logging Objective https://msdn.microsoft.com/en-us/library/24395wz3.aspx Many industries are required by legal and regulatory requirements to be: Auditable – all activities that affect user state or balances are formally tracked Traceable – it’s possible to determine where an activity occurs in all tiers of the application High integrity – logs cannot be overwritten or tampered with by local or remote users Well-written applications will dual-purpose logs and activity traces for audit and monitoring, and make it easy to track a transaction without excessive effort https://www.owasp.org/index.php/Error_Handling,_Auditing_and_Logging or access to the system. They should possess the ability to easily track or identify potential fraud or anomalies end-to-end. Environments Affected All. Relevant COBIT Topics DS11 – Manage Data – All sections should be reviewed, but in particular: DS11.4 Source data error handling DS11.8 Data input error handling Description Error handling, debug messages, auditing and logging are different aspects of the same topic: how to track events within an application: Best practices Fail safe – do not fail open Dual purpose logs Audit logs are legally protected – protect them Reports and search logs using a read-only copy or complete replica Error Handling Error handling takes two forms: structured exception handling and functional error checking. Structured exception handling is always preferred as it is easier to cover 100% of code. On the other hand it is very hard to cover 100% of all errors in languages that do not have exceptions, such as PHP 4. Code that covers 100% of errors is extraordinarily verbose and difficult to read, and can contain subtle bugs and errors in the error handling code itself. Motivated attackers like to see error messages as they might leak information that leads to further attacks, or may leak privacy related information. Web application error handling is rarely robust enough to survive a penetration test. Applications should always fail safe. If an application fails to an unknown state, i
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