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This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters."}, {"lang": "es", "value": "En Puma (RubyGem) anterior a la versi\u00f3n  4.3.2 y anterior a la versi\u00f3n 3.12.3, si una aplicaci\u00f3n que usa Puma permite la entrada no segura en un encabezado de respuesta, un atacante puede usar caracteres de nueva l\u00ednea (es decir, `CR`,` LF` o` / r`, ` / n`) para finalizar el encabezado e inyectar contenido malicioso, como encabezados adicionales o un cuerpo de respuesta completamente nuevo. Esta vulnerabilidad se conoce como divisi\u00f3n de respuesta HTTP. Si bien no es un ataque en s\u00ed mismo, la divisi\u00f3n de la respuesta es un vector para varios otros ataques, como las secuencias de cross-site scripting (XSS). Esto est\u00e1 relacionado con CVE-2019-16254, que corrigi\u00f3 esta vulnerabilidad para el servidor web WEBrick Ruby. 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{"bugzilla": {"description": "rubygem-puma: attacker is able to use newline characters to insert malicious content (HTTP Response Splitting), this could lead to XSS", "id": "1816187", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1816187"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-113", "details": ["In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters.", "A flaw was discovered in rubygem-puma, where it did not properly forbid untrusted input in a response header. This flaw allows an attacker with the ability to tamper with HTTP headers to insert a new-line and insert malicious content, allowing an HTTP response splitting, which exposes the risk of attacks such as cross-site scripting."], "name": "CVE-2020-5247", "package_state": [{"cpe": "cpe:/a:redhat:cloudforms_managementengine:5", "fix_state": "Will not fix", "impact": "low", "package_name": "rubygem-puma", "product_name": "CloudForms Management Engine 5"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Affected", "package_name": "system", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Will not fix", "package_name": "rh-ror50-rubygem-puma", "product_name": "Red Hat Software Collections"}, {"cpe": "cpe:/a:redhat:storage:3", "fix_state": "Affected", "package_name": "rubygem-puma", "product_name": "Red Hat Storage 3"}], "public_date": "2020-03-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-5247\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-5247\nhttps://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v"], "statement": "This issue affects the version of rubygem-puma shipped with Red Hat Gluster Storage 3, as it does not validate whether the header value could inject a CR or LF and inject their own HTTP response.\nRed Hat CloudForms uses affected RubyGem Puma, however, it is not vulnerable since it does not have custom code enabling early hints, HTTP/2 support or way to return 103 response. A future update may fix affected RubyGem.", "threat_severity": "Moderate"}