Request URL override
Summary: PortSwigger Research describes HTTP headers that can override parts of a request URL, affecting how requests are routed and processed while intermediate systems remain unaware of them. The write-up states this can bypass reverse proxy and web application firewall rulesets, enable cache poisoning where caching is present, and allow forging of log entries.
Bottom line: A request your WAF and reverse proxy never see as altered can still be routed and cached under a different URL, so the rulesets you rely on for filtering and the logs you rely on for investigation may both reflect something other than what actually happened.
Read the original at PortSwigger Research ↗
- Topics
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