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Man-in-the-Middle (MitM) Affecting golang-bin package, versions <0:1.9.4-1.el7

Severity

 Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.29% (70th percentile)

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  • Snyk IDSNYK-RHEL7-GOLANGBIN-4773914
  • published26 Jul 2021
  • disclosed4 Oct 2017
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Introduced: 4 Oct 2017

CVE-2017-15042  (opens in a new tab)
CWE-300  (opens in a new tab)

How to fix?

Upgrade RHEL:7 golang-bin to version 0:1.9.4-1.el7 or higher.
This issue was patched in RHSA-2018:0878.

NVD Description

Note: Versions mentioned in the description apply only to the upstream golang-bin package and not the golang-bin package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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.