hyperguard Covers PCI DSS’ New “Un-validated Redirects and Forwards” Risk
Posted by hyperguard on April 21, 2010
You have probably heard that the PCI DSS requirement 6.5 has been impacted by the updated OWASP’s Top 10 Web application risk ranking. Specifically, new risks “security misconfiguration” and “un-validated redirects and forwards” have been added to list. As stated in the PCI DSS standard,
“The vulnerabilities listed at 6.5.1 through 6.5.10 were current in the OWASP guide when this version of PCI DSS [1.2] was published [July, 2009]. However, if and when the OWASP guide is updated, the current version must be used for these requirements.”
We’re not particularly happy with the “security misconfiguration” addition since – at least in the current formulation and examples. This topic appears to be a bit too general, as examples listed in the recommendations also cover hardening of operating systems, which is certainly important but perhaps not in the core of web application security. However, if restricted to applications, hyperguard – configured properly – does protect against the typical attack vectors lists, such as unauthorized access to unused pages or un-patched flaws.
On the other hand, the “un-validated redirects and forwards” is one hyperguard has protected users against for a long time. As our customers know, hyperguard has a proud history of security far beyond OWASP recommendations.
Here’s how you can cover your compliance issues for the new “un-validated redirects and forwards” Top 10 risk:
- Use the hyperguard Whitelist Handler and validate all parameters used in URLs. For example the url=evil.com in the request http://www.example.com/redirect.jsp?url=evil.comThe Whitelist Handler validates attributes of HTTP requests (in URLs and also the HTTP Post request body). An argument is ONLY valid if it matches with a regular expression set in the Protected-Form-Fields settings.If the parameters do not match with the existing regular expressions for the protected input fields, the configuration item “allow-unknown-form-fields” can be setup to unconditionally allow them. If this option is not activated, hyperguard will reject the request – with an error code. Unconditionally allowed requests are flagged in the log files, this information can be used by the administrator to further enhance the managed whitelist.
- For output checks on redirects, use hyperguard’s Script Handler to define the target of a redirect and to define which domain(s) are permitted.
This will take care of your compliance issue with the “un-validated redirects and forwards” OWASP risk. Our technical team is available for further help with this issue – just email us and we’ll sort out your issues: email@example.com
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