Lighttpd Improper Limitation of a Pathname to a Restricted Directory (Path Traversal) Vulnerability - CVE-2018-19052

An issue was discovered in mod_alias_physical_handler in mod_alias.c in lighttpd before 1.4.50. There is potential ../ path traversal of a single directory above an alias target with a specific mod_alias configuration where the matched alias lacks a trailing 39/39 character but the alias target filesystem path does have a trailing 39/39 character.