CVE-2019-12331
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductPhpoffice Phpspreadsheet
PublishedNov 7, 2019
First seenNov 7, 2019
How to fix
Update
- phpoffice phpspreadsheet1.8.0 or later
- phpoffice/phpspreadsheet1.8.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| phpoffice phpspreadsheet | v < 1.8.0 | 1.8.0 |
| phpoffice/phpspreadsheetPackagist | v < 1.8.0 | 1.8.0 |
| phpoffice/phpexcelPackagist | v ≤ 1.8.2 | — |
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