CVE-2019-12331

Public Exploit

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.

Category

8.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.32%
Third-Party Advisory github.com Third-Party Advisory usd.de
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01 third party advisory
https://herolab.usd.de/security-advisories/usd-2019-0046/ third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2019-12331?
CVE-2019-12331 has been scored as a high severity vulnerability.
How to fix CVE-2019-12331?
To fix CVE-2019-12331, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-12331 being actively exploited in the wild?
It is possible that CVE-2019-12331 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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