CVE-2017-15271

{"id": "CVE-2017-15271", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 4.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "MEDIUM", "availabilityImpact": "PARTIAL", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV30": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.2}]}, "published": "2017-11-15T16:29:00.373", "references": [{"url": "http://packetstormsecurity.com/files/144972/PSFTPd-Windows-FTP-Server-10.0.4-Build-729-Use-After-Free-Log-Injection.html", "tags": ["Third Party Advisory", "VDB Entry"], "source": "cve@mitre.org"}, {"url": "http://www.securityfocus.com/archive/1/541518/100/0/threaded", "source": "cve@mitre.org"}, {"url": "https://www.exploit-db.com/exploits/43144/", "tags": ["Third Party Advisory", "VDB Entry"], "source": "cve@mitre.org"}, {"url": "https://www.x41-dsec.de/lab/advisories/x41-2017-006-psftpd/", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "A use-after-free issue could be triggered remotely in the SFTP component of PSFTPd 10.0.4 Build 729. This issue could be triggered prior to authentication. The PSFTPd server did not automatically restart, which enabled attackers to perform a very effective DoS attack against this service. By sending a crafted SSH identification / version string to the server, a NULL pointer dereference could be caused, apparently because of a race condition in the window message handling, performing the cleanup for invalid connections. This incorrect cleanup code has a use-after-free."}, {"lang": "es", "value": "Podr\u00eda desencadenarse de forma remota un problema de uso de memoria previamente liberada en el componente SFTP de PSFTPd 10.0.4 Build 729. Este problema podr\u00eda desencadenarse antes de la autenticaci\u00f3n. El servidor PSFTPd no se reinici\u00f3 correctamente, lo que permiti\u00f3 que atacantes llevasen a cabo un ataque DoS muy efectivo contra este servicio. Al enviar una cadena SSH de identificaci\u00f3n/versi\u00f3n manipulada al servidor, podr\u00eda provocarse una desreferencia de puntero NULL, aparentemente debido a una condici\u00f3n de carrera en la manipulaci\u00f3n de la ventana de mensaje, realizando la limpieza para conexiones no v\u00e1lidas. Este c\u00f3digo incorrecto de limpieza tiene un uso de memoria previamente liberada."}], "lastModified": "2018-10-09T20:01:08.727", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:psftp:psftpd:10.0.4:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8B13806B-8D82-4705-8390-002602BDA270"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}