Ruby -- Denial of Service and Unsafe Object Creation Vulnerability in JSON

Description:

Aaron Patterson reports:

When parsing certain JSON documents, the JSON gem can be coerced in to creating Ruby symbols in a target system. Since Ruby symbols are not garbage collected, this can result in a denial of service attack.

The same technique can be used to create objects in a target system that act like internal objects. These "act alike" objects can be used to bypass certain security mechanisms and can be used as a spring board for SQL injection attacks in Ruby on Rails.

References:

• CVE name CVE-2013-0269

Affects:

• ruby >=1.9,1 <1.9.3.385,1
• rubygem18-json <1.7.7
• rubygem19-json <1.7.7
• rubygem18-json_pure <1.7.7
• rubygem19-json_pure <1.7.7

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