CVE-2014-3556: Command Injection
First published: Tue Aug 05 2014(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/nginx | <1.6.1 | 1.6.1 |
| redhat/nginx | <1.7.4 | 1.7.4 |
| Nginx | >=1.5.6<1.6.1 | |
| Nginx | >=1.7.0<1.7.4 |
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Reference Links
- http://mailman.nginx.org/pipermail/nginx-announce/2014/000144.html
- http://marc.info/?l=bugtraq&m=142103967620673&w=2
- http://nginx.org/download/patch.2014.starttls.txt
- https://bugzilla.redhat.com/show_bug.cgi?id=1126891
- https://access.redhat.com/security/cve/CVE-2014-3556
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1126892
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1126891#c7
Frequently Asked Questions
What is the severity of CVE-2014-3556?
CVE-2014-3556 is considered to have a medium severity due to its potential for man-in-the-middle attacks.
How do I fix CVE-2014-3556?
To remediate CVE-2014-3556, upgrade to Nginx version 1.6.1 or 1.7.4 or later.
Which versions of Nginx are affected by CVE-2014-3556?
Nginx versions 1.5.x and 1.6.x before 1.6.1, as well as 1.7.x before 1.7.4, are affected by CVE-2014-3556.
What kind of attack does CVE-2014-3556 allow?
CVE-2014-3556 allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions.
What is the root cause of CVE-2014-3556?
The vulnerability arises from the STARTTLS implementation not properly restricting I/O buffering in the SMTP proxy of Nginx.
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