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.
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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-06T10:50:17.339Z

Reserved: 2014-05-14T00:00:00

Link: CVE-2014-3556

cve-icon Vulnrichment

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cve-icon NVD

Status : Deferred

Published: 2014-12-29T20:59:03.943

Modified: 2025-04-12T10:46:40.837

Link: CVE-2014-3556

cve-icon Redhat

Severity : Moderate

Publid Date: 2014-08-05T00:00:00Z

Links: CVE-2014-3556 - Bugzilla

cve-icon OpenCVE Enrichment

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Weaknesses