Threats affecting pkg:deb/debian/vsftpd

vsftpd through 3.0.5 contains an authentication bypass vulnerability in ssl_data_accept() that allows unauthenticated attackers to hijack FTPS data connections by resuming their own TLS session ticket. Attackers sharing the victim's source IP can obtain a ticket via AUTH TLS, then connect to the victim's PASV port to steal downloads or inject upload data.

vsftpd versions up to 3.0.5 have an access control bypass vulnerability where authenticated FTP users can execute commands that should be denied by using RFC 775 X-prefixed aliases. The vulnerability arises because the cmds_denied check only compares literal tokens, allowing commands like XRMD, XMKD, XCWD, XPWD, or XCUP to bypass restrictions and perform blocked operations such as deleting directories.