Ruby on Rails JSON Parser Crafted Payload YAML Subset Decoding Remote Code Execution


2017-06-16 20:03
CVE-2013-0333 rails
CVE-2013-0333 ruby-activesupport-2.3
2017-06-16 19:02
2017-04-01 19:10
2017-01-05 20:15


Ruby on Rails contains a flaw in the JSON parser. Rails supports multiple
parsing backends, one of which involves transforming JSON into YAML via the
YAML parser. With a specially crafted payload, an attacker can subvert the
backend into decoding a subset of YAML. This may allow a remote attacker to
bypass restrictions, allowing them to bypass authentication systems, inject
arbitrary SQL, inject and execute arbitrary code, or perform a DoS attack on
a Rails application.

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The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.

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Affected package information

Package Patched in Unaffected in
activesupport ~> 2.3.16,>= 3.0.20 None