CVE-2017-15042

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    CVE-2017-15042

    Published: 5 Oct 2017Last Modified: 8 Jul 2026

    Summary:

    Details: An unintended cleartext issue exists in Go before 1.8.4 and 1.9.x before 1.9.1. RFC 4954 requires that, during SMTP, the PLAIN auth scheme must only be used on network connections secured with TLS. The original implementation of smtp.PlainAuth in Go 1.0 enforced this requirement, and it was documented to do so. In 2013, upstream issue #5184, this was changed so that the server may decide whether PLAIN is acceptable. The result is that if you set up a man-in-the-middle SMTP server that doesn't advertise STARTTLS and does advertise that PLAIN auth is OK, the smtp.PlainAuth implementation sends the username and password.

    References: http://www.securityfocus.com/bid/101197, https://access.redhat.com/errata/RHSA-2017:3463, https://access.redhat.com/errata/RHSA-2018:0878, https://golang.org/cl/68210, https://groups.google.com/d/msg/golang-dev/RinSE3EiJBI/kYL7zb07AgAJ, https://security.gentoo.org/glsa/201710-23, https://github.com/golang/go/issues/22134, https://golang.org/cl/68023

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.9

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High