CVE-2014-3556

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Summary

CVECVE-2014-3556
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2014-12-29 20:59:03 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v2.0 6.8 from [email protected]

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

Problem Types: CWE-77 | n/a

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application F5 Nginx All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Bug 1126891 – CVE-2014-3556 nginx: SMTP STARTTLS plaintext injection flaw af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Third Party Advisory
'[security bulletin] HPSBOV03227 rev.1 - HP SSL for OpenVMS, Remote Disclosure of Information, Denial' - MARC af854a3a-2127-422b-91ae-364da2661108 marc.info Issue Tracking, Third Party Advisory
nginx.org/download/patch.2014.starttls.txt af854a3a-2127-422b-91ae-364da2661108 nginx.org Patch, Vendor Advisory
[nginx-announce] nginx security advisory (CVE-2014-3556) af854a3a-2127-422b-91ae-364da2661108 mailman.nginx.org Patch, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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