- hap_listener.tpl (Coraza block): `http-request deny deny_status 400 if
{ req.fhdr_cnt(content-type) gt 1 }`. With two Content-Type lines Coraza
evaluates every value (text/xml on either line selects its XML processor,
which accepts a form body without error) while Apache merges the lines
and PHP parses the body as a form. Measured with Coraza v3.7.0 + PHP 8.3:
`application/x-www-form-urlencoded` + `text/xml` put the payload in
$_POST uninspected. Live: two lines -> 400 over HTTP/1.1 and HTTP/2; one
comma-joined line (browser XHR double-set) is unaffected.
- coraza-spoa/config.yaml: SecRequestBodyJsonDepthLimit 64 (was 1024 from
the recommended file). Coraza's JSON flattening is quadratic in depth:
depth 300 (601 B) = 297 ms, depth 1000 (2 KB) = 3.1 s, past the 100 ms
fail-open timeout. Over the limit it is a 0.1 ms parse error, which WHP's
enforce-mode rule denies on a complete body (live: depth 65/300/1000 ->
403, depth 64 and a depth-9 global-styles body -> 200). Legitimate depth
measured on WordPress core, Gutenberg, WooCommerce and Elementor JSON:
max 8.
- test-waf-body-inspection.py: 17 tests.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
shadowdaoandClaude Opus 5.5
cc0652e0c0