CVE-2017-13090

{"id": "CVE-2017-13090", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 9.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "MEDIUM", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 10.0, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": true}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}, {"type": "Secondary", "source": "cret@cert.org", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "published": "2017-10-27T19:29:00.377", "references": [{"url": "http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bba", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "source": "cret@cert.org"}, {"url": "http://www.debian.org/security/2017/dsa-4008", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "cret@cert.org"}, {"url": "http://www.securityfocus.com/bid/101590", "tags": ["Issue Tracking", "Third Party Advisory", "VDB Entry"], "source": "cret@cert.org"}, {"url": "http://www.securitytracker.com/id/1039661", "tags": ["Issue Tracking", "Third Party Advisory", "VDB Entry"], "source": "cret@cert.org"}, {"url": "https://access.redhat.com/errata/RHSA-2017:3075", "source": "cret@cert.org"}, {"url": "https://security.gentoo.org/glsa/201711-06", "tags": ["Issue Tracking", "Third Party Advisory"], "source": "cret@cert.org"}, {"url": "https://www.synology.com/support/security/Synology_SA_17_62_Wget", "source": "cret@cert.org"}, {"url": "https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html", "tags": ["Issue Tracking", "Patch", "Third Party Advisory"], "source": "cret@cert.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-119"}]}, {"type": "Secondary", "source": "cret@cert.org", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "The retr.c:fd_read_body() function is called when processing OK responses. When the response is sent chunked in wget before 1.19.2, the chunk parser uses strtol() to read each chunk's length, but doesn't check that the chunk length is a non-negative number. The code then tries to read the chunk in pieces of 8192 bytes by using the MIN() macro, but ends up passing the negative chunk length to retr.c:fd_read(). As fd_read() takes an int argument, the high 32 bits of the chunk length are discarded, leaving fd_read() with a completely attacker controlled length argument. The attacker can corrupt malloc metadata after the allocated buffer."}, {"lang": "es", "value": "Se llama a la funci\u00f3n retr.c:fd_read_body() cuando se procesan las respuestas OK. Cuando la respuesta se env\u00eda fragmentada en wget en versiones anteriores a la 1.19.2, el analizador de fragmentos utiliza srtol() para leer la longitud de cada fragmento, pero no comprueba si esta longitud es un n\u00famero no negativo. El c\u00f3digo entonces intenta leer el fragmento en partes de 8192 bytes utilizando la macro MIN(), pero acaba pasando la longitud negativa del fragmento a retr.c:fd_read(). Ya que fd_read() toma un argumento int, los 32 bits de la longitud del fragmento se descartan, dejando fd_read() con un argumento de longitud controlado por completo por el atacante. El atacante puede corromper metadatos malloc despu\u00e9s del b\u00fafer asignado."}], "lastModified": "2017-12-30T02:29:01.187", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:gnu:wget:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BB992E4D-6D7A-421F-BC30-123E4ADD2D82", "versionEndIncluding": "1.19.1"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43"}, {"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"}], "operator": "OR"}]}], "sourceIdentifier": "cret@cert.org"}