Date: Tue, 14 Dec 2021 12:29:20 -0800 From: Aaron Patterson <aaron.patterson@...il.com> To: oss-security@...ts.openwall.com, rubyonrails-security@...glegroups.com, ruby-security-ann@...glegroups.com Subject: [CVE-2021-44528] Possible Open Redirect in Host Authorization Middleware There is a possible open redirect vulnerability in the Host Authorization middleware in Action Pack. This vulnerability has been assigned the CVE identifier CVE-2021-44528. Versions Affected: >= 6.0.0. Not affected: < 6.0.0 Fixed Versions: 18.104.22.168, 22.214.171.124, 7.0.0.rc2 Impact ------ Specially crafted "X-Forwarded-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. For example, configuration files that look like this: ``` config.hosts << '.EXAMPLE.com' ``` When an allowed host contains a leading dot, a specially crafted Host header can be used to redirect to a malicious website. This vulnerability is similar to CVE-2021-22881 and CVE-2021-22942. Releases -------- The fixed releases are available at the normal locations. Patches ------- To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset. * 6-0-host-authorzation-open-redirect.patch - Patch for 6.0 series * 6-1-host-authorzation-open-redirect.patch - Patch for 6.1 series * 7-0-host-authorzation-open-redirect.patch - Patch for 7.0 series Please note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases. Credits ------- Thanks to [@krynos](https://hackerone.com/krynos?type=user) for originally reporting this! Huge thanks to [@stefschenkelaars](https://hackerone.com/stefschenkelaars?type=user) for writing a patch along with tests to fix this issue! -- Aaron Patterson http://tenderlovemaking.com/ Content of type "text/html" skipped Download attachment "6-0-host-authorzation-open-redirect.patch" of type "application/octet-stream" (6033 bytes) Download attachment "6-1-host-authorzation-open-redirect.patch" of type "application/octet-stream" (6123 bytes) Download attachment "7-0-host-authorzation-open-redirect.patch" of type "application/octet-stream" (6123 bytes)
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