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OpenAdvisories
Medium ALAS2-2025-2931 1 CVE

Moderate: ruby security update (Amazon Linux 2)

Published Jul 17, 2025 · Updated Jul 30, 2025

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2025-6442: Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI-CAN-21876.

Fixed packages 16

ReleasePackageFixed in
Amazon Linux · 2 ruby 0:2.0.0.648-36.amzn2.0.15
Amazon Linux · 2 ruby-debuginfo 0:2.0.0.648-36.amzn2.0.15
Amazon Linux · 2 ruby-devel 0:2.0.0.648-36.amzn2.0.15
Amazon Linux · 2 ruby-doc 0:2.0.0.648-36.amzn2.0.15
Amazon Linux · 2 ruby-irb 0:2.0.0.648-36.amzn2.0.15
Amazon Linux · 2 ruby-libs 0:2.0.0.648-36.amzn2.0.15
Amazon Linux · 2 ruby-tcltk 0:2.0.0.648-36.amzn2.0.15
Amazon Linux · 2 rubygem-bigdecimal 0:1.2.0-36.amzn2.0.15
Amazon Linux · 2 rubygem-io-console 0:0.4.2-36.amzn2.0.15
Amazon Linux · 2 rubygem-json 0:1.7.7-36.amzn2.0.15
Amazon Linux · 2 rubygem-minitest 0:4.3.2-36.amzn2.0.15
Amazon Linux · 2 rubygem-psych 0:2.0.0-36.amzn2.0.15
Amazon Linux · 2 rubygem-rake 0:0.9.6-36.amzn2.0.15
Amazon Linux · 2 rubygem-rdoc 0:4.0.0-36.amzn2.0.15
Amazon Linux · 2 rubygems 0:2.0.14.1-36.amzn2.0.15
Amazon Linux · 2 rubygems-devel 0:2.0.14.1-36.amzn2.0.15

Vulnerabilities 1

  • Medium 6.5
    CVE-2025-6442

    Ruby WEBrick read_header HTTP Request Smuggling Vulnerability

    Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy…

    ruby WEBrick ruby2.3 ruby2.5 Debian Ubuntu Azure Linux RubyGems

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2025-6442.html