CVE-2017-12425

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4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases."}, {"lang": "es", "value": "Se ha descubierto un problema en Varnish HTTP Cache 4.0.1 a 4.0.4; 4.1.0 a 4.1.7; 5.0.0; y 5.1.0 a 5.1.2. Una instrucci\u00f3n if incorrecta en el c\u00f3digo fuente de varnishd significa que ciertas peticiones no v\u00e1lidas formuladas por el cliente pueden desembocar en una aserci\u00f3n, relacionada con un desbordamiento de enteros. Esto provoca que el proceso de trabajo varnishd se anule y se reinicie, perdiendo todos los contenidos de la cach\u00e9 en el proceso. Por lo tanto, un atacante puede bloquear el proceso de trabajo varnishd cuando quiera y evitar de forma efectiva que env\u00eden contenidos (ataque por Denegaci\u00f3n de Servicio). El nombre de archivo de c\u00f3digo fuente espec\u00edfico que contiene la instrucci\u00f3n err\u00f3nea var\u00eda seg\u00fan las versiones."}], "id": "CVE-2017-12425", "lastModified": "2026-06-17T01:03:16.887", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2017-08-04T09:29:00.237", "references": [{"source": "cve@mitre.org", "url": "http://www.debian.org/security/2017/dsa-3924"}, {"source": "cve@mitre.org", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1477222"}, {"source": "cve@mitre.org", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.suse.com/show_bug.cgi?id=1051917"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://github.com/varnishcache/varnish-cache/issues/2379"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-security-announce/2017/msg00186.html"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://www.varnish-cache.org/security/VSV00001.html#vsv00001"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.debian.org/security/2017/dsa-3924"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1477222"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.suse.com/show_bug.cgi?id=1051917"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/varnishcache/varnish-cache/issues/2379"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-security-announce/2017/msg00186.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.varnish-cache.org/security/VSV00001.html#vsv00001"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Varnish Cache project for reporting this issue.", "bugzilla": {"description": "varnish: Missing check for integer overflow when handling chunk sizes in HTTP requests", "id": "1477222", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1477222"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-190", "details": ["An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases.", "An integer overflow flaw, leading to assertion failure, was found in the way Varnish handled chunk sizes in HTTP requests. A remote attacker could use this flaw to make the Varnish daemon restart unexpectedly due to an assertion failure by sending a specially crafted HTTP request."], "name": "CVE-2017-12425", "package_state": [{"cpe": "cpe:/a:redhat:rhel_software_collections:2", "fix_state": "Will not fix", "package_name": "rh-varnish4-varnish", "product_name": "Red Hat Software Collections"}], "public_date": "2017-08-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-12425\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-12425\nhttps://www.varnish-cache.org/security/VSV00001.html"], "threat_severity": "Moderate"}

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