CVE-2019-18277

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{}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:haproxy:haproxy:*:*:*:*:*:*:*:*", "matchCriteriaId": "B76D46D9-8507-4E75-AFCD-D8BADBC38ADC", "versionEndExcluding": "2.0.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the \"chunked\" value were not being correctly rejected. The impact was limited but if combined with the \"http-reuse always\" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification)."}, {"lang": "es", "value": "Se encontr\u00f3 un fallo en HAProxy versiones anteriores a 2.0.6. En el modo legacy, los mensajes caracterizados por un encabezado de codificaci\u00f3n de transferencia que no ten\u00eda el valor \"chunked\" no hab\u00edan sido rechazados correctamente. El impacto fue limitado, pero si se combina con la configuraci\u00f3n \"http-reuse always\", podr\u00eda usarse para ayudar a construir un ataque de tr\u00e1fico no autorizado de peticiones HTTP contra un componente vulnerable que emplee un analizador permisivo que ignore el encabezado de longitud de contenido tan pronto como se visualice uno de codificaci\u00f3n de transferencia (incluso si no es completamente v\u00e1lido de acuerdo con la especificaci\u00f3n)."}], "id": "CVE-2019-18277", "lastModified": "2026-06-17T02:24:44.453", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2019-10-23T14:15:10.557", "references": [{"source": "cve@mitre.org", "url": "http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html"}, {"source": "cve@mitre.org", "url": "http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html"}, {"source": "cve@mitre.org", "url": "https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581"}, {"source": "cve@mitre.org", "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html"}, {"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://nathandavison.com/blog/haproxy-http-request-smuggling"}, {"source": "cve@mitre.org", "url": "https://usn.ubuntu.com/4174-1/"}, {"source": "cve@mitre.org", "url": "https://www.mail-archive.com/haproxy%40formilux.org/msg34926.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=196a7df44d8129d1adc795da020b722614d6a581"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00045.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://nathandavison.com/blog/haproxy-http-request-smuggling"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://usn.ubuntu.com/4174-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.mail-archive.com/haproxy%40formilux.org/msg34926.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2020:1725", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "haproxy-0:1.8.23-3.el8", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2020-04-28T00:00:00Z"}, {"advisory": "RHSA-2020:1287", "cpe": "cpe:/a:redhat:openshift:3.11::el7", "package": "haproxy-0:1.8.23-3.el7", "product_name": "Red Hat OpenShift Container Platform 3.11", "release_date": "2020-04-07T00:00:00Z"}, {"advisory": "RHSA-2020:1936", "cpe": "cpe:/a:redhat:openshift:4.4::el7", "package": "haproxy-0:2.0.13-3.el7", "product_name": "Red Hat OpenShift Container Platform 4.4", "release_date": "2020-05-04T00:00:00Z"}, {"advisory": "RHSA-2020:2265", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-haproxy18-haproxy-0:1.8.24-2.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2020-05-26T00:00:00Z"}, {"advisory": "RHSA-2020:2265", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-haproxy18-haproxy-0:1.8.24-2.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2020-05-26T00:00:00Z"}, {"advisory": "RHSA-2020:2265", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "rh-haproxy18-haproxy-0:1.8.24-2.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS", "release_date": "2020-05-26T00:00:00Z"}], "bugzilla": {"description": "haproxy: HTTP request smuggling issue with transfer-encoding header containing an obfuscated \"chunked\" value", "id": "1759697", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1759697"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L", "status": "verified"}, "cwe": "CWE-444", "details": ["A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the \"chunked\" value were not being correctly rejected. The impact was limited but if combined with the \"http-reuse always\" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification)."], "mitigation": {"lang": "en:us", "value": "- Reconsider the use of `http-reuse always` if possible\n- Disable HTTP Keep-Alive (also called HTTP Connection reuse) in the backend\n- Fix the backend server to correctly parse Transfer-Encoding/Content-Length headers"}, "name": "CVE-2019-18277", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "haproxy", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "haproxy", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:openshift:3.10", "fix_state": "Will not fix", "package_name": "haproxy", "product_name": "Red Hat OpenShift Container Platform 3.10"}, {"cpe": "cpe:/a:redhat:openshift:3.9", "fix_state": "Will not fix", "package_name": "haproxy", "product_name": "Red Hat OpenShift Container Platform 3.9"}], "public_date": "2019-09-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2019-18277\nhttps://nvd.nist.gov/vuln/detail/CVE-2019-18277"], "statement": "To exploit this vulnerability a vulnerable backend server is required. In particular the server should incorrectly parse the Transfer-Encoding HTTP header.\nThis issue did not affect the versions of haproxy as shipped with Red Hat Enterprise Linux 6, and 7 as they did not include support for `http-reuse` option.", "threat_severity": "Moderate"}

{}