Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| F5 | Nginx | >= 1.5.6, < 1.6.1 |
Related Weaknesses (CWE)
References
- http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.htmlPatchVendor Advisory
- http://marc.info/?l=bugtraq&m=142103967620673&w=2Issue TrackingThird Party Advisory
- http://nginx.org/download/patch.2014.starttls.txtPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1126891Issue TrackingThird Party Advisory
- http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.htmlPatchVendor Advisory
- http://marc.info/?l=bugtraq&m=142103967620673&w=2Issue TrackingThird Party Advisory
- http://nginx.org/download/patch.2014.starttls.txtPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1126891Issue TrackingThird Party Advisory
FAQ
What is CVE-2014-3556?
CVE-2014-3556 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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...
How severe is CVE-2014-3556?
CVE-2014-3556 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2014-3556?
Check the references section above for vendor advisories and patch information. Affected products include: F5 Nginx.