Version Disclosure (ASP.NET)

Summary#

Invicti identified a version disclosure (ASP.NET) in the target web server's HTTP response.

This information can help an attacker gain a greater understanding of the systems in use and potentially develop further attacks targeted at the specific version of ASP.NET.

Impact#

An attacker might use the disclosed information to harvest specific security vulnerabilities for the version identified.

Remediation#

Apply the following changes to your web.config file to prevent information leakage by using custom error pages and removing X-AspNet-Version from HTTP responses.

<System.Web>
     <httpRuntime enableVersionHeader="false" />
     <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#

CWE-205, WASC-13, OWASP 2017-A6, ISO27001-A.18.1.3, HIPAA-164.306(a), 164.308(a), OWASP 2013-A5, CAPEC-170