{"id":"UBUNTU-CVE-2014-3556","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attack, a similar issue to CVE-2011-0411.","modified":"2025-07-16T07:31:57.462891Z","published":"2014-12-29T20:59:00Z","withdrawn":"2025-07-18T16:43:02Z","upstream":["CVE-2014-3556"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2014-3556"},{"type":"REPORT","url":"http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2014-3556"}],"affected":[{"package":{"name":"nginx","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/nginx@1.4.6-1ubuntu3?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.6-1ubuntu3"}]}],"versions":["1.4.1-3ubuntu1","1.4.3-2ubuntu1","1.4.4-1ubuntu1","1.4.4-2ubuntu1","1.4.4-4ubuntu1","1.4.5-1ubuntu1","1.4.6-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"nginx","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-common","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-core","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-core-dbg","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-doc","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-extras","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-extras-dbg","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-full","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-full-dbg","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-light","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-light-dbg","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-naxsi","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-naxsi-dbg","binary_version":"1.4.6-1ubuntu3"},{"binary_name":"nginx-naxsi-ui","binary_version":"1.4.6-1ubuntu3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2014/UBUNTU-CVE-2014-3556.json"}}],"schema_version":"1.7.3","severity":[{"type":"Ubuntu","score":"medium"}]}