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."
The product does not handle or incorrectly handles an exceptional condition.
| Link | Tags |
|---|---|
| https://hackerone.com/reports/1178562 | patch third party advisory exploit |
| https://lists.debian.org/debian-lts-announce/2021/10/msg00009.html | third party advisory mailing list |
| https://www.oracle.com/security-alerts/cpuapr2022.html | third party advisory patch |
| https://security.netapp.com/advisory/ntap-20210902-0004/ | third party advisory |
| https://www.ruby-lang.org/en/news/2021/07/07/starttls-stripping-in-net-imap/ | vendor advisory |
| https://github.com/ruby/ruby/commit/a21a3b7d23704a01d34bd79d09dc37897e00922a | third party advisory patch |
| https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html | mailing list |
| https://security.gentoo.org/glsa/202401-27 | vendor advisory |