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  5. CVE-2020-25613

CVE-2020-25613: WEBRick vulnerable to HTTP Request/Response Smuggling

May 24, 2022 (updated May 29, 2025)

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.

References

  • github.com/advisories/GHSA-gwfg-cqmg-cf8f
  • github.com/ruby/webrick
  • github.com/ruby/webrick/commit/076ac636bf48b7a492887ce4de7041de23e6c00d
  • github.com/ruby/webrick/commit/7618049fa57ddad2efff2a7bc7dad7d2d8a311b1
  • github.com/ruby/webrick/commit/8946bb38b4d87549f0d99ed73c62c41933f97cc7
  • github.com/ruby/webrick/commit/af2efdcdf826f25592202d187c53963e7932e4b9
  • github.com/rubysec/ruby-advisory-db/blob/master/gems/webrick/CVE-2020-25613.yml
  • hackerone.com/reports/965267
  • lists.debian.org/debian-lts-announce/2023/04/msg00033.html
  • lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ
  • lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PFP3E7KXXT3H3KA6CBZPUOGA5VPFARRJ
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YTZURYROG3FFED3TYCQOBV66BS4K6WOV
  • nvd.nist.gov/vuln/detail/CVE-2020-25613
  • security.gentoo.org/glsa/202401-27
  • security.netapp.com/advisory/ntap-20210115-0008
  • www.ruby-lang.org/en/news/2020/09/29/http-request-smuggling-cve-2020-25613

Code Behaviors & Features

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Affected versions

All versions before 1.4.4, all versions starting from 1.5.0 before 1.5.1, version 1.5.0, all versions starting from 1.6.0 before 1.6.1, version 1.6.0

Fixed versions

  • 1.6.1
  • 1.5.1
  • 1.4.4

Solution

Upgrade to versions 1.4.4, 1.5.1, 1.6.1 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Learn more about CVSS

Weakness

  • CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Source file

gem/webrick/CVE-2020-25613.yml

Spotted a mistake? Edit the file on GitLab.

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