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18 lines
924 B
Markdown
18 lines
924 B
Markdown
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### [CVE-2019-12331](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12331)
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### Description
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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.
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### POC
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#### Reference
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- https://herolab.usd.de/security-advisories/usd-2019-0046/
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#### Github
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No PoCs found on GitHub currently.
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