CVE-2013-1856: Improper Input Validation

March 19, 2013 (updated August 8, 2019)

The ActiveSupport::XmlMini_JDOM backend in lib/active_support/xml_mini/jdom.rb in the Active Support component does not properly restrict the capabilities of the XML parser, which allows remote attackers to read arbitrary files or cause a denial of service (resource consumption) via vectors involving (1) an external DTD or (2) an external entity declaration in conjunction with an entity reference.

References

web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-1856
www.openwall.com/lists/oss-security/2013/03/18/4

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