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Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP's uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host, so a URL such as http://%31%32%37%2E%30%2E%30%2E%31/ is seen by a caller's allowlist validator with host %31%32%37%2E%30%2E%30%2E%31 (not an IP address), which passes the allowlist check. hackney's normalizer then decodes the host to 127.0.0.1 and opens a TCP connection to loopback. Because hackney:request/5 always calls hackney_url:normalize/2 with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost.
This issue affects hackney: from 0.13.0 before 4.0.1.
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Title: hackney de benoitc, Description: Vulnerabilidad de conflicto de interpretación en benoitc hackney permite la falsificación de solicitudes del lado del servidor. hackney_url:normalize/2 decodifica URL el componente de host después de que la URL ha sido analizada en un registro #hackney_url{}. uri_string:parse/1 e inet:parse_address/1 de OTP no decodifican los escapes de porcentaje en el host, por lo que una URL como http://%31%32%37%2E%30%2E%30%2E%31/ es vista por el validador de lista de permitidos de un llamador con el host %31%32%37%2E%30%2E%30%2E%31 (no una dirección IP), lo que pasa la verificación de la lista de permitidos. El normalizador de hackney luego decodifica el host a 127.0.0.1 y abre una conexión TCP a loopback. Debido a que hackney:request/5 siempre llama a hackney_url:normalize/2 sin opción de exclusión, cada solicitud que toma una URL binaria o de lista se ve afectada. La misma técnica alcanza los servicios de metadatos de instancias en la nube (169.254.169.254), redes RFC1918 y cualquier interfaz de administración escuchando en localhost.
Este problema afecta a hackney: desde 0.13.0 antes de 4.0.1.
Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP's uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host, so a URL such as http://%31%32%37%2E%30%2E%30%2E%31/ is seen by a caller's allowlist validator with host %31%32%37%2E%30%2E%30%2E%31 (not an IP address), which passes the allowlist check. hackney's normalizer then decodes the host to 127.0.0.1 and opens a TCP connection to loopback. Because hackney:request/5 always calls hackney_url:normalize/2 with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost.
This issue affects hackney: from 0.13.0 before 4.0.1.
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