ProFTPD is a widely-used open-source FTP server software designed to serve files to multiple clients over the internet or a local area network. This software runs on various operating systems such as Windows, macOS, and Linux. The FTP server can be configured to allow anonymous access or authenticated access with a username and password.
However, a critical vulnerability was detected in the mod_copy module of ProFTPD 1.3.5, identified as CVE-2015-3306. This vulnerability permits remote attackers to read and write arbitrary files on the server via the site cpfr and site cpto commands. The root cause of the vulnerability is insufficient sanitization of user-provided input on the server-side.
Exploitation of CVE-2015-3306 permits a remote attacker to access system files that could give them access to sensitive information such as login credentials, financial records, and other confidential data. Hackers can also leverage this vulnerability to install malicious software on the attacked system, leading to compromise of system integrity and total control over the network.
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REFERENCES
- http://www.rapid7.com/db/modules/exploit/unix/ftp/proftpd_modcopy_exec
- exploit-db.com: 36803
- http://packetstormsecurity.com/files/131555/ProFTPd-1.3.5-Remote-Command-Execution.html
- debian.org: DSA-3263
- http://packetstormsecurity.com/files/131567/ProFTPd-CPFR-CPTO-Proof-Of-Concept.html
- http://packetstormsecurity.com/files/132218/ProFTPD-1.3.5-Mod_Copy-Command-Execution.html
- lists.opensuse.org: openSUSE-SU-2015:1031
- lists.fedoraproject.org: FEDORA-2015-7164
- lists.fedoraproject.org: FEDORA-2015-6401
- securityfocus.com: 74238
- exploit-db.com: 36742
- lists.fedoraproject.org: FEDORA-2015-7086
- http://packetstormsecurity.com/files/131505/ProFTPd-1.3.5-File-Copy.html
- http://packetstormsecurity.com/files/162777/ProFTPd-1.3.5-Remote-Command-Execution.html
To protect your ProFTPD server against this vulnerability, implement the following precautions:
- Upgrade to the latest version of ProFTPD to fix the issue.
- Modify firewall rules to block traffic on affected ports.
- Limit access to the FTP server via IP address whitelisting.
- Disable FTP services if they are not essential.
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