{"answers":{"affected":"4 open source packages ship an affected version, including actionpack. It affects 2 products.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-22881 exists.","fix":"Upgrade actionpack to a fixed version for your release line: 6.0.3.5 or 6.1.2.1.","what":"CVE-2021-22881 is a medium-severity vulnerability in Fedoraproject Fedora, published on 11 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-22881 and fix it if it is affected.\n\nWhat it is: CVE-2021-22881 is a medium-severity vulnerability in Fedoraproject Fedora, published on 11 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-22881 exists.\n\nAffected packages and fixed versions:\n- actionpack (RubyGems): affected from 6.0.0; fixed in 6.0.3.5\n- actionpack (RubyGems): affected from 6.0.0; fixed in 6.0.3.5\n- actionpack (RubyGems): affected from 6.1.0; fixed in 6.1.2.1\n- actionpack (RubyGems): affected from 6.1.0; fixed in 6.1.2.1\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-22881/ (Markdown: https://insights.sbomify.com/CVE-2021-22881/index.md)","id":"CVE-2021-22881","markdown":"https://insights.sbomify.com/CVE-2021-22881/index.md","name":"CVE-2021-22881","record":{"aliases":["DEBIAN-CVE-2021-22881","GHSA-8877-prq4-9xfw","UBUNTU-CVE-2021-22881"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Ruby on Rails","requires_auth":"none","summary":"Attackers can redirect users to malicious sites via crafted Host headers if allowed hosts use leading dots in Ruby on Rails Action Pack.","user_interaction":"required","vuln_class":"open_redirect"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"hackerone","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"rails","vendor":"rubyonrails"}],"cvss":{"score":6.1,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 suffers from an open redirect vulnerability. Specially crafted `Host` headers in combination with certain \"allowed host\" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted `Host` header can be used to redirect to a malicious website.","ecosystems":["RubyGems"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":1,"refs":[{"date":null,"kind":"nuclei","ref":"http/cves/2021/CVE-2021-22881.yaml","stars":null,"title":"Ruby on Rails - Open Redirect via Host Header Injection"}],"tier":"weaponised"},"has_fix":true,"headline":"Actionpack Open Redirect Vulnerability","id":"CVE-2021-22881","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":"fedoraproject:fedora","products":["fedoraproject:fedora","rubyonrails:rails"],"type":"open_redirect","year":"2021"},"n_packages":4,"n_references":7,"next":{"headline":"Denial of service in UniFi Protect","id":"CVE-2021-22882"},"packages":[{"ecosystem":"RubyGems","fixed":["6.0.3.5"],"introduced":["6.0.0"],"last_affected":[],"package":"actionpack","purl":null,"source":"GHSA-8877-prq4-9xfw"},{"ecosystem":"RubyGems","fixed":["6.0.3.5"],"introduced":["6.0.0"],"last_affected":[],"package":"actionpack","purl":"pkg:gem/actionpack","source":"GHSA-8877-prq4-9xfw"},{"ecosystem":"RubyGems","fixed":["6.1.2.1"],"introduced":["6.1.0"],"last_affected":[],"package":"actionpack","purl":null,"source":"GHSA-8877-prq4-9xfw"},{"ecosystem":"RubyGems","fixed":["6.1.2.1"],"introduced":["6.1.0"],"last_affected":[],"package":"actionpack","purl":"pkg:gem/actionpack","source":"GHSA-8877-prq4-9xfw"}],"prev":{"headline":"Active Record subject to Regular Expression Denial-of-Service (ReDoS)","id":"CVE-2021-22880"},"products":["https://github.com/rails/rails"],"published":"2021-02-11","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"attribution","licence":"MIT","name":"Nuclei templates"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"Attackers can redirect users to malicious sites via crafted Host headers if allowed hosts use leading dots in Ruby on Rails Action Pack.","url":"https://insights.sbomify.com/CVE-2021-22881/"}