J2EE Misconfiguration: Missing Custom Error Page
The default error page of a web application should not display sensitive information about the product.
Description
A Web application must define a default error page for 4xx errors (e.g. 404), 5xx (e.g. 500) errors and 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.
Demonstrations
The following examples help to illustrate the nature of this weakness and describe methods or techniques which can be used to mitigate the risk.
Note that the examples here are by no means exhaustive and any given weakness may have many subtle varieties, each of which may require different detection methods or runtime controls.
Example One
In the snippet below, an unchecked runtime exception thrown from within the try block may cause the container to display its default error page (which may contain a full stack trace, among other things).
Public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
...
} catch (ApplicationSpecificException ase) {
logger.error("Caught: " + ase.toString());
}
}See Also
Weaknesses in this category are related to improper check or handling of exceptional conditions.
This category identifies Software Fault Patterns (SFPs) within the Exposed Data cluster (SFP23).
This category represents one of the phyla in the Seven Pernicious Kingdoms vulnerability classification. It includes weaknesses that are typically introduced during un...
This view (slice) covers all the elements in CWE.
This view (slice) lists weaknesses that can be introduced during implementation.
This view (slice) covers issues that are found in Java programs that are not common to all languages.
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