cve/2019/CVE-2019-12331.md

CVE-2019-12331

Description

PHPOffice PhpSpreadsheet before 1.8.0 has an XXE issue. The XmlScanner decodes the sheet1.xml from an .xlsx to utf-8 if something else than UTF-8 is declared in the header. This was a security measurement to prevent CVE-2018-19277 but the fix is not sufficient. By double-encoding the the xml payload to utf-7 it is possible to bypass the check for the string ‚<!ENTITY‘ and thus allowing for an xml external entity processing (XXE) attack.

POC

Reference

• https://herolab.usd.de/security-advisories/usd-2019-0046/

Github

No PoCs found on GitHub currently.