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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.1012 CVE-2020-10663: Unsafe Object Creation Vulnerability in JSON (Additional fix) 20 March 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Ruby Publisher: Ruby Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-10663 CVE-2013-0269 Reference: ASB-2013.0028 ESB-2013.1181 ESB-2013.0952 Original Bulletin: https://www.ruby-lang.org/en/news/2020/03/19/json-dos-cve-2020-10663/ - --------------------------BEGIN INCLUDED TEXT-------------------- CVE-2020-10663: Unsafe Object Creation Vulnerability in JSON (Additional fix) Posted by mame on 19 Mar 2020 There is an unsafe object creation vulnerability in the json gem bundled with Ruby. This vulnerability has been assigned the CVE identifier CVE-2020-10663 . We strongly recommend upgrading the json gem. Details When parsing certain JSON documents, the json gem (including the one bundled with Ruby) can be coerced into creating arbitrary objects in the target system. This is the same issue as CVE-2013-0269 . The previous fix was incomplete, which addressed JSON.parse(user_input) , but didn t address some other styles of JSON parsing including JSON(user_input) and JSON.parse(user_input, nil) . See CVE-2013-0269 in detail. Note that the issue was exploitable to cause a Denial of Service by creating many garbage-uncollectable Symbol objects, but this kind of attack is no longer valid because Symbol objects are now garbage-collectable. However, creating arbitrary objects may cause severe security consequences depending upon the application code. Please update the json gem to version 2.3.0 or later. You can use gem update json to update it. If you are using bundler, please add gem "json", ">= 2.3.0" to your Gemfile . Affected versions o JSON gem 2.2.0 or prior Credits Thanks to Jeremy Evans for discovering this issue. History o Originally published at 2020-03-19 13:00:00 (UTC) - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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