CVEvulnerability
CVE-2014-3556
6.8 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2014-12-29
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 2.0 ([email protected])
- 6.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-77
Description
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.
Affected configurations
• f5 nginx (>= 1.5.6 < 1.6.1)
• f5 nginx (>= 1.7.0 < 1.7.4)
Related
Weakness · CWE (1)
- CWE-77 Improper Neutralization of Special Elements used in a Command weakness
References
- http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html Patch, Vendor Advisory
- http://marc.info/?l=bugtraq&m=142103967620673&w=2 Issue Tracking, Third Party Advisory
- http://nginx.org/download/patch.2014.starttls.txt Patch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1126891 Issue Tracking, Third Party Advisory
- http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html Patch, Vendor Advisory
- http://marc.info/?l=bugtraq&m=142103967620673&w=2 Issue Tracking, Third Party Advisory
- http://nginx.org/download/patch.2014.starttls.txt Patch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1126891 Issue Tracking, Third Party Advisory