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Date: Tue, 22 Oct 2019 23:00:45 +0200
From: Dominik Stadler <centic@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2019-12415 - XML External Entity (XXE) Processing in Apache POI

Severity: Important

Vendor:
The Apache Software Foundation

Versions Affected:
Apache POI up to version 4.1.0

Description:
When using the tool XSSFExportToXml to convert user-provided Microsoft
Excel documents, a specially crafted document can allow an attacker to
read files from the local filesystem or from internal network resources
via XML External Entity (XXE) Processing.

Mitigation:
Apache POI 4.1.0 and before: users who do not use the tool XSSFExportToXml
are not affected. affected users are advised to update to Apache POI 4.1.1
which fixes this vulnerability.

Credit:
This issue was discovered by Artem Smotrakov from SAP

References:
https://en.wikipedia.org/wiki/XML_external_entity_attack

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