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CVE-2021-32066

Published: 15 July 2021

An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does not raise an exception when StartTLS fails with an an unknown response, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."

Priority

Medium

Cvss 3 Severity Score

7.4

Score breakdown

Status

Package Release Status
ruby1.9.1
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

ruby2.0
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

ruby2.3
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial
Released (2.3.1-2~ubuntu16.04.16+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
ruby2.5
Launchpad, Ubuntu, Debian
focal Does not exist

groovy Does not exist

hirsute Does not exist

impish Does not exist

jammy Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

bionic
Released (2.5.1-1ubuntu1.10)
ruby2.7
Launchpad, Ubuntu, Debian
bionic Does not exist

impish
Released (2.7.4-1ubuntu1)
trusty Does not exist

upstream Needs triage

xenial Does not exist

focal
Released (2.7.0-5ubuntu1.5)
groovy
Released (2.7.1-3ubuntu1.4)
hirsute
Released (2.7.2-4ubuntu1.2)

Severity score breakdown

Parameter Value
Base score 7.4
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N