CVE-2017-12621: Improper Restriction of XML External Entity Reference

September 28, 2017 (updated October 10, 2017)

If a custom doctype entity is declared with a “SYSTEM” entity with a URL and that entity is used in the body of the Jelly file, during parser instantiation the parser will attempt to connect to said URL.

References

www.securityfocus.com/bid/101052
www.securitytracker.com/id/1039444
issues.apache.org/jira/browse/JELLY-293
nvd.nist.gov/vuln/detail/CVE-2017-12621

Code Behaviors & Features

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