Date: Tue, 27 Nov 2018 16:06:36 -0500 From: Rafael Mendonça França <rafaelmfranca@...il.com> To: Rubyonrails-Security <rubyonrails-security@...glegroups.com>, Ruby-Security-Ann <ruby-security-ann@...glegroups.com>, Oss-Security <oss-security@...ts.openwall.com> Subject: [CVE-2018-16476] Broken Access Control vulnerability in Active Job There is a vulnerability in Active Job. This vulnerability has been assigned the CVE identifier CVE-2018-16476. Versions Affected: >= 4.2.0 Not affected: < 4.2.0 Fixed Versions: 4.2.11, 220.127.116.11, 18.104.22.168, 22.214.171.124 Impact ------ Carefully crafted user input can cause Active Job to deserialize it using GlobalId and allow an attacker to have access to information that they should not have. Vulnerable code will look something like this: MyJob.perform_later(user_input) All users running an affected release should either upgrade or use one of the workarounds immediately. Releases -------- The FIXED releases are available at the normal locations. Workarounds ----------- Putting the following monkey patch in an intializer can help to mitigate the issue: ``` require 'active_job' require 'active_job/arguments' module ArgumentsNotDeserializingGlobalId def deserialize_argument(argument) case argument when String argument else super end end end ActiveJob::Arguments.singleton_class.prepend(ArgumentsNotDeserializingGlobalId) ``` 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. * 4-2-activejob-direct-access.patch - Patch for 4.2 series * 5-0-activejob-direct-access.patch - Patch for 5.0 series * 5-1-activejob-direct-access.patch - Patch for 5.1 series * 5-2-activejob-direct-access.patch - Patch for 5.2 series Please note that only the 5.x and 4.2.x 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. Rafael França Content of type "text/html" skipped Download attachment "4-2-activejob-direct-access.patch" of type "application/octet-stream" (1780 bytes) Download attachment "5-0-activejob-direct-access.patch" of type "application/octet-stream" (1796 bytes) Download attachment "5-1-activejob-direct-access.patch" of type "application/octet-stream" (1796 bytes) Download attachment "5-2-activejob-direct-access.patch" of type "application/octet-stream" (1796 bytes)
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