IssueDescription:

It was found that Apache POI would resolve entities in OOXML documents. A remote attacker able to supply OOXML documents that are parsed by Apache POI could use this flaw to read files accessible to the user running the application server, and potentially perform more advanced XML External Entity (XXE) attacks.

Apache POI before 3.10.1 and 3.11.x before 3.11-beta2 allows remote attackers to cause a denial of service (CPU consumption and crash) via a crafted OOXML file, aka an XML Entity Expansion (XEE) attack.

A flaw was found in the way Apache POI, the Java API for Microsoft Office file formats, handles memory when processing certain Channel Definition Format (CDF) / Compound File Binary Format (CFBF) documents. Apache POI allocates arrays with arbitrary sizes specified in the document. A remote attacker could exploit this flaw by providing a specially-crafted CDF / CFBF file to an application using Apache POI, leading to an to OutOfMemoryError exception in the current thread, or potentially destabilization of the whole Java Virtual Machine instance.