An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
| Link | Tags |
|---|---|
| https://hackerone.com/reports/965267 | third party advisory permissions required |
| https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/ | vendor advisory |
| https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7 | third party advisory patch |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ/ | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV/ | vendor advisory |
| https://security.netapp.com/advisory/ntap-20210115-0008/ | third party advisory |
| https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html | mailing list |
| https://security.gentoo.org/glsa/202401-27 | vendor advisory |