FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

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

Affected packages
1.9,1	<=	ruby	<	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

Details

VuXML ID	c79eb109-a754-45d7-b552-a42099eb2265
Discovery	2013-02-11
Entry	2013-02-16

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.

[source]

References

CVE Name

CVE-2013-0269