Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.482
EPSS Ranking 97.6%
CVSS Severity
CVSS v2 Score 6.8
References
- 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
- 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
Products affected by CVE-2014-3556
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cpe:2.3:a:f5:nginx:1.5.10
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cpe:2.3:a:f5:nginx:1.5.11
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cpe:2.3:a:f5:nginx:1.5.12
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cpe:2.3:a:f5:nginx:1.5.13
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cpe:2.3:a:f5:nginx:1.5.6
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cpe:2.3:a:f5:nginx:1.5.7
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cpe:2.3:a:f5:nginx:1.5.8
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cpe:2.3:a:f5:nginx:1.5.9
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cpe:2.3:a:f5:nginx:1.6.0
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cpe:2.3:a:f5:nginx:1.7.0