A security issue has been discovered in Ruby before versions 3.0.2, 2.7.4 and 2.6.8. Net::IMAP does not raise an exception when StartTLS fails with 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.”
A security issue has been discovered in Ruby before versions 3.0.2, 2.7.4 and 2.6.8. Net::IMAP does not raise an exception when StartTLS fails with 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.”
https://www.ruby-lang.org/en/news/2021/07/07/starttls-stripping-in-net-imap/ https://hackerone.com/reports/1178562 https://github.com/ruby/net-imap/commit/adba6f0c3e5c5607c4822b9120322eb7e9a77891
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