CWE-756: Missing Custom Error Page
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Edit Custom FilterThe product does not return custom error pages to the user, possibly exposing sensitive information.
This table specifies different individual consequences
associated with the weakness. The Scope identifies the application security area that is
violated, while the Impact describes the negative technical impact that arises if an
adversary succeeds in exploiting this weakness. The Likelihood provides information about
how likely the specific consequence is expected to be seen relative to the other
consequences in the list. For example, there may be high likelihood that a weakness will be
exploited to achieve a certain impact, but a low likelihood that it will be exploited to
achieve a different impact.
This table shows the weaknesses and high level categories that are related to this
weakness. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to
similar items that may exist at higher and lower levels of abstraction. In addition,
relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user
may want to explore.
Relevant to the view "Research Concepts" (CWE-1000)
Relevant to the view "Software Development" (CWE-699)
Example 1 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). (bad code)
Example Language: Java
Public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try { }... } catch (ApplicationSpecificException ase) {logger.error("Caught: " + ase.toString()); }Example 2 The mode attribute of the <customErrors> tag in the Web.config file defines whether custom or default error pages are used. In the following insecure ASP.NET application setting, custom error message mode is turned off. An ASP.NET error message with detailed stack trace and platform versions will be returned. (bad code)
Example Language: ASP.NET
<customErrors mode="Off" />
A more secure setting is to set the custom error message mode for remote users only. No defaultRedirect error page is specified. The local user on the web server will see a detailed stack trace. For remote users, an ASP.NET error message with the server customError configuration setting and the platform version will be returned. (good code)
Example Language: ASP.NET
<customErrors mode="RemoteOnly" />
Another secure option is to set the mode attribute of the <customErrors> tag to use a custom page as follows: (good code)
Example Language: ASP.NET
<customErrors mode="On" defaultRedirect="YourErrorPage.htm" />
This MemberOf Relationships table shows additional CWE Categories and Views that
reference this weakness as a member. This information is often useful in understanding where a
weakness fits within the context of external information sources.
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