UBUNTU-CVE-2014-3556

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UBUNTU-CVE-2014-3556

Summary:

Details: The STARTTLS implementation in mail/ngx_mail_smtp_handler.c in the SMTP proxy in nginx 1.5.x and 1.6.x before 1.6.1 and 1.7.x before 1.7.4 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.

References: https://ubuntu.com/security/CVE-2014-3556, http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html, https://www.cve.org/CVERecord?id=CVE-2014-3556