Synopsis
While testing a prior vulnerability (CVE-2016-0638) for writing a detection plugin, Tenable noticed that Oracle's class filter blacklist hadn't changed. Another WebLogic bypass object (weblogic.corba.utils.MarshallObject) had been published on GitHub. Tenable tested to see if that had been patched via the April 19, 2016 patches as well, and it appears that is not the case. As such, an unauthenticated attacker can still achieve remote code execution using a known blacklist bypass. Tenable generated an exploit that popped calc.exe against a patched WebLogic Server 12.1.3 as a demonstration and provided it to Oracle.
Solution
Oracle has released a patch for this issue as part of the July 19, 2016 CPU.
Additional References
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html#AppendixFMWDisclosure Timeline
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