Difference between revisions of "Missing Error Handling"

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[[Category:FIXME|add links
In addition, one should classify vulnerability based on the following subcategories: Ex:<nowiki>[[Category:Error Handling Vulnerability]]</nowiki>
Availability Vulnerability
Authorization Vulnerability
Authentication Vulnerability
Concurrency Vulnerability
Configuration Vulnerability
Cryptographic Vulnerability
Encoding Vulnerability
Error Handling Vulnerability
Input Validation Vulnerability
Logging and Auditing Vulnerability
Session Management Vulnerability]]

Revision as of 08:58, 26 February 2009

This is a Vulnerability. To view all vulnerabilities, please see the Vulnerability Category page.

This article includes content generously donated to OWASP by Fortify.JPG.

Last revision (mm/dd/yy): 02/26/2009

Vulnerabilities Table of Contents


A web application must define a default error page for 404 errors, 500 errors and to catch java.lang. Throwable exceptions to prevent attackers from mining information from the application container's built-in error response.

When an attacker explores a web site looking for vulnerabilities, the amount of information that the site provides is crucial to the eventual success or failure of any attempted attacks. If the application shows the attacker a stack trace, it relinquishes information that makes the attacker's job significantly easier. For example, a stack trace might show the attacker a malformed SQL query string, the type of database being used, and the version of the application container. This information enables the attacker to target known vulnerabilities in these components.

The application configuration should specify a default error page in order to guarantee that the application will never leak error messages to an attacker. Handling standard HTTP error codes is useful and user-friendly in addition to being a good security practice, and a good configuration will also define a last-chance error handler that catches any exception that could possibly be thrown by the application.

Risk Factors



A "HTTP 404 - File not found" error tells an attacker that the requested file doesn't exist rather than that he doesn't have access to the file. This can help attacker to decide his next step.

Related Attacks

Related Vulnerabilities

Related Controls

Related Technical Impacts