CVE-2014-3556

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    CVE-2014-3556

    Published: 29 Dec 2014Last Modified: 10 Apr 2026

    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: http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html, http://marc.info/?l=bugtraq&m=142103967620673&w=2, http://nginx.org/download/patch.2014.starttls.txt, https://bugzilla.redhat.com/show_bug.cgi?id=1126891, http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html, http://nginx.org/download/patch.2014.starttls.txt, http://marc.info/?l=bugtraq&m=142103967620673&w=2, https://bugzilla.redhat.com/show_bug.cgi?id=1126891

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High