WAF 340613

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Rule ID


Alert Message

Atomicorp.com WAF Rules: Invalid character in request or headers


This rule checks for the NULL character in any URI, Filename, Header name or Header, except for Cookies and special known cases. NULLs can be used to bypass certain security checks and are often used as part of evasion attacks on web application firewalls.

False Positives

This can be triggered if an application legitimately uses a NULL as a value for a Header. This has only been seen used for some Cookies, and should never be seen for URLs, File Names or Header Names.

It recommended that you report this as a false positive so our security team can determine if this is a legitimate case, or if its clever attack on your systems. Instructions to report false positives are details on the Reporting False Positives wiki page.

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Outside References

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