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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25613
Reference (s):
- https://github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7
- https://security.netapp.com/advisory/ntap-20210115-0008/
- https://www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613/
- FEDORA:FEDORA-2020-02ca18c2a0
- URL: https://lists.fedoraproject.org/archives/list/[email protected]/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ/