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CVE-2014-4877 is an absolute path traversal vulnerability in GNU Wget versions before 1.16. When recursive retrieval is enabled, Wget incorrectly handles symbolic-link information returned in FTP LIST responses. A malicious FTP server can return two directory entries for the same filename, with one representing a symbolic link, causing Wget to write downloaded content to an arbitrary location writable by the user running Wget.
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This repository contains a single Metasploit auxiliary module: 'modules/auxiliary/server/wget_symlink_file_write.rb'. The module exploits CVE-2014-4877, a vulnerability in GNU Wget (versions prior to 1.16) when used in recursive mode with an FTP server. The exploit works by running a malicious FTP server that, when accessed by a vulnerable wget client, uses symlinks to write arbitrary data to arbitrary files on the victim's filesystem. The attacker can specify both the file to overwrite (TARGET_FILE) and the data to write (TARGET_DATA). The module listens on a configurable port (default 2121) and provides instructions for the target to run a wget command against the attacker's server. The exploit is operational and provides a real-world arbitrary file write capability, but is not weaponized for mass exploitation. The code is written in Ruby and is designed to be run within the Metasploit framework.
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