CVE-2016-6798: Improper Restriction of XML External Entity Reference

July 19, 2017 (updated July 25, 2017)

In the XSS Protection API module in Apache Sling, the method XSS.getValidXML() uses an insecure SAX parser to validate the input string, which allows for XXE attacks in all scripts which use this method to validate user input, potentially allowing an attacker to read sensitive data on the filesystem, perform same-site-request-forgery (SSRF), port-scanning behind the firewall or DoS the application.

References

www.securityfocus.com/bid/99873
nvd.nist.gov/vuln/detail/CVE-2016-6798

Code Behaviors & Features

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