CVE-2014-3556
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…
Does this matter?
Lower severity and a low EPSS score (7.83%). Track it; it rarely justifies an emergency change on its own.
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 2.0
- 6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
- EPSS
- 7.83% probability · 94th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-77
- Affected
- f5/nginx
- Source
- secalert@redhat.com
References
- http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.htmlPatch, Vendor Advisory
- http://marc.info/?l=bugtraq&m=142103967620673&w=2Issue Tracking, Third Party Advisory
- http://nginx.org/download/patch.2014.starttls.txtPatch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1126891Issue Tracking, Third Party Advisory
- http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.htmlPatch, Vendor Advisory
- http://marc.info/?l=bugtraq&m=142103967620673&w=2Issue Tracking, Third Party Advisory
- http://nginx.org/download/patch.2014.starttls.txtPatch, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1126891Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.