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CVE-2017-16651 is a file disclosure vulnerability in Roundcube Webmail versions 1.1.0 through 1.3.2. The flaw arises from insufficient sanitization of the _timezone parameter in the login form, which can be manipulated by an authenticated attacker to reference arbitrary files on the host filesystem. The vulnerability is exploited via crafted requests to the _task=settings&_action=upload-display&_from=timezone endpoint, leveraging the filesystem_attachments plugin to serve the contents of arbitrary files, including sensitive configuration files. Exploitation requires a valid user session.
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This repository contains a single Metasploit auxiliary module (modules/auxiliary/gather/roundcube_auth_file_read.rb) that exploits an authenticated file disclosure vulnerability in Roundcube Webmail (CVE-2017-16651). The exploit targets Roundcube versions 1.1.0 through 1.3.2 and requires valid user credentials to authenticate to the webmail interface. Once authenticated, the module leverages a flaw in the timezone settings functionality to read arbitrary files from the server's filesystem. The default file targeted is /etc/passwd, but this can be changed by the user. The module interacts with the target over HTTP, using both GET and POST requests to perform authentication and trigger the vulnerability. The result of a successful exploit is the retrieval and storage of the specified file's contents. The code is written in Ruby and is designed to be run within the Metasploit Framework.
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