{"id":"UBUNTU-CVE-2017-7418","details":"ProFTPD before 1.3.5e and 1.3.6 before 1.3.6rc5 controls whether the home directory of a user could contain a symbolic link through the AllowChrootSymlinks configuration option, but checks only the last path component when enforcing AllowChrootSymlinks. Attackers with local access could bypass the AllowChrootSymlinks control by replacing a path component (other than the last one) with a symbolic link. The threat model includes an attacker who is not granted full filesystem access by a hosting provider, but can reconfigure the home directory of an FTP user.","modified":"2025-10-24T04:46:14Z","published":"2017-04-04T17:59:00Z","upstream":["CVE-2017-7418"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-7418"},{"type":"REPORT","url":"https://github.com/proftpd/proftpd/commit/ecff21e0d0e84f35c299ef91d7fda088e516d4ed"},{"type":"REPORT","url":"https://github.com/proftpd/proftpd/commit/f59593e6ff730b832dbe8754916cb5c821db579f"},{"type":"REPORT","url":"https://github.com/proftpd/proftpd/pull/444/commits/349addc3be4fcdad9bd4ec01ad1ccd916c898ed8"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-7418"}],"affected":[{"package":{"name":"proftpd-dfsg","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/proftpd-dfsg@1.3.5a-1ubuntu0.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.5-2","1.3.5a-1","1.3.5a-1build1","1.3.5a-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-basic"},{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-dev"},{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-mod-geoip"},{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-mod-ldap"},{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-mod-mysql"},{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-mod-odbc"},{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-mod-pgsql"},{"binary_version":"1.3.5a-1ubuntu0.1","binary_name":"proftpd-mod-sqlite"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-7418.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}