AMF3 Java implementations Improper Restriction of XML External Entity Reference ('XXE')

2017-04-06T00:00:00
ID SSV:92916
Type seebug
Reporter Root
Modified 2017-04-06T00:00:00

Description

A detailed analysis of the reference: https://codewhitesec.blogspot.kr/2017/04/amf.html

Some Java implementations of AMF3 deserializers allow the external entity references (XXEs) from XML documents embedded within AMF3 messages. If the XML parsing is handled incorrectly it could potentially expose sensitive data on the server, denial of service, or server side request forgery.

  • Flamingo amf-serializer by Exadel, version 2.2.0 - CVE-2017-3206
  • Flex BlazeDS , version 4.6.0.23207 - CVE-2015-3269
  • GraniteDS, version 3.1.1. GA - CVE-2016-2340 (see VU#279472)
  • WebORB for Java by Midnight Coders, version 5.1.1.0 - CVE-2017-3208

Products using these libraries may also be impacted.

More information is provided in the researcher's advisory.