CVE-2014-3556

MEDIUM severity · CVSS 6.8 · Command injection

6.8CVSS MEDIUM

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexity—

Privileges required—

User interaction—

Confidentiality impact—

Integrity impact—

Availability impact—

Exploit probability (EPSS)48%

AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products we track (1)

Nginx

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html ↗

CVE-2014-3556

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information