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When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote."}, {"lang": "es", "value": "libcurl podr\u00eda leer fuera de un b\u00fafer asignado en la memoria din\u00e1mica (heap) cuando realiza FTP. Cuando libcurl se conecta a un servidor FTP y logra iniciar sesi\u00f3n correctamente (de forma an\u00f3nima o no), pregunta al servidor por el directorio actual con el comando \"PWD\". El servidor contesta con una respuesta 257 que contiene la ruta (dentro de comillas dobles). El nombre de ruta devuelto lo almacena libcurl para usos posteriores. Debido a un error en el analizador sint\u00e1ctico de cadenas para este nombre de directorio, un nombre de directorio pasado de esta forma pero sin una comilla doble de cierre desembocar\u00eda en que libcurl no a\u00f1ade un byte NUL final al b\u00fafer que sostiene el nombre. Cuando libcurl accede a la cadena, podr\u00eda leer m\u00e1s all\u00e1 del b\u00fafer de memoria din\u00e1mica (heap) asignado y cerrarse inesperadamente o acceder err\u00f3neamente a datos m\u00e1s all\u00e1 del b\u00fafer, creyendo que forma parte de la ruta. Un servidor malicioso podr\u00eda aprovechar este hecho y evitar que clientes de libcurl lo empleen - el comando PWD siempre se emite en nuevas conexiones FTP y el error tiene una gran posibilidad de provocar una violaci\u00f3n de acceso. El hecho de que este problema se ha mantenido sin conocer durante tanto tiempo podr\u00eda indicar que las respuestas PWD mal formadas son raras en nuevos servidores. No se tiene constancia de exploits de este fallo. Este bug fue introducido en el commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7) en marzo de 2005. En la versi\u00f3n 7.46.0 de libcurl, el analizador sint\u00e1ctico siempre finaliza la cadena en cero, pero tambi\u00e9n la rechaza si no se finaliza correctamente con una comilla doble final."}], "id": "CVE-2017-1000254", "lastModified": "2023-11-07T02:37:56.077", "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": "2017-10-06T13:29:00.207", "references": [{"source": "cve@mitre.org", "url": "http://www.debian.org/security/2017/dsa-3992"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/101115"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1039509"}, {"source": "cve@mitre.org", "url": "https://access.redhat.com/errata/RHSA-2018:2486"}, {"source": "cve@mitre.org", "url": "https://access.redhat.com/errata/RHSA-2018:3558"}, {"source": "cve@mitre.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://curl.haxx.se/673d0cd8.patch"}, {"source": "cve@mitre.org", "tags": ["Patch", "Vendor Advisory"], "url": "https://curl.haxx.se/docs/adv_20171004.html"}, {"source": "cve@mitre.org", "url": "https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "cve@mitre.org", "url": "https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E"}, {"source": "cve@mitre.org", "url": "https://security.gentoo.org/glsa/201712-04"}, {"source": "cve@mitre.org", "url": "https://support.apple.com/HT208331"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-119"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Curl project for reporting this issue. Upstream acknowledges Max Dymond as the original reporter.", "affected_release": [{"advisory": "RHSA-2018:2486", "cpe": "cpe:/a:redhat:jboss_core_services:1", "package": "curl", "product_name": "Red Hat JBoss Core Services 1", "release_date": "2018-08-16T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el6", "package": "httpd24-curl-0:7.61.1-1.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el6", "package": "httpd24-httpd-0:2.4.34-7.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el6", "package": "httpd24-nghttp2-0:1.7.1-7.el6", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 6", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-curl-0:7.61.1-1.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-httpd-0:2.4.34-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2018-11-13T00:00:00Z"}, {"advisory": "RHSA-2018:3558", "cpe": "cpe:/a:redhat:rhel_software_collections:3::el7", "package": "httpd24-nghttp2-0:1.7.1-7.el7", "product_name": "Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS", "release_date": "2018-11-13T00:00:00Z"}], "bugzilla": {"description": "curl: FTP PWD response parser out of bounds read", "id": "1495541", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1495541"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "verified"}, "cwe": "CWE-125", "details": ["libcurl may read outside of a heap allocated buffer when doing FTP. When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the current directory with the `PWD` command. The server then responds with a 257 response containing the path, inside double quotes. The returned path name is then kept by libcurl for subsequent uses. Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data beyond the buffer, thinking it was part of the path. A malicious server could abuse this fact and effectively prevent libcurl-based clients to work with it - the PWD command is always issued on new FTP connections and the mistake has a high chance of causing a segfault. The simple fact that this has issue remained undiscovered for this long could suggest that malformed PWD responses are rare in benign servers. We are not aware of any exploit of this flaw. This bug was introduced in commit [415d2e7cb7](https://github.com/curl/curl/commit/415d2e7cb7), March 2005. In libcurl version 7.56.0, the parser always zero terminates the string but also rejects it if not terminated properly with a final double quote."], "name": "CVE-2017-1000254", "package_state": [{"cpe": "cpe:/a:redhat:rhel_dotnet:1.0", "fix_state": "Out of support scope", "package_name": "rh-dotnetcore10-curl", "product_name": ".NET Core 1.0 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:1.1", "fix_state": "Out of support scope", "package_name": "rh-dotnetcore11-curl", "product_name": ".NET Core 1.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:2.0", "fix_state": "Out of support scope", "package_name": "rh-dotnet20-curl", "product_name": ".NET Core 2.0 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/a:redhat:rhel_dotnet:2.1", "fix_state": "Will not fix", "package_name": "rh-dotnet21-curl", "product_name": ".NET Core 2.1 on Red Hat Enterprise Linux"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "curl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:7::hypervisor", "fix_state": "Will not fix", "package_name": "mingw-virt-viewer", "product_name": "Red Hat Enterprise Virtualization 3"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_web_server:3", "fix_state": "Not affected", "package_name": "curl", "product_name": "Red Hat JBoss Web Server 3"}], "public_date": "2017-10-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2017-1000254\nhttps://nvd.nist.gov/vuln/detail/CVE-2017-1000254\nhttps://curl.haxx.se/docs/adv_20171004.html"], "threat_severity": "Moderate", "upstream_fix": "curl 7.56.0"}