CVE-2021-32066

high

Description

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."

References

https://www.ruby-lang.org/en/news/2021/07/07/starttls-stripping-in-net-imap/

https://www.oracle.com/security-alerts/cpuapr2022.html

https://security.netapp.com/advisory/ntap-20210902-0004/

https://security.gentoo.org/glsa/202401-27

https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html

https://lists.debian.org/debian-lts-announce/2021/10/msg00009.html

https://hackerone.com/reports/1178562

https://github.com/ruby/ruby/commit/a21a3b7d23704a01d34bd79d09dc37897e00922a

Details

Source: Mitre, NVD

Published: 2021-08-01

Updated: 2024-01-24

Risk Information

CVSS v2

Base Score: 5.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 7.4

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: High