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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXZ2d3YtaDY5bS13ZzZm

XXE in PHPSpreadsheet due to incomplete fix for previous encoding issue

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.

Permalink: https://github.com/advisories/GHSA-vvwv-h69m-wg6f
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXZ2d3YtaDY5bS13ZzZm
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 4 years ago
Updated: 3 months ago

CVSS Score: 8.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Identifiers: GHSA-vvwv-h69m-wg6f, CVE-2019-12331
References:

• https://nvd.nist.gov/vuln/detail/CVE-2019-12331
• https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01
• https://github.com/PHPOffice/PhpSpreadsheet/releases/tag/1.8.0
• https://herolab.usd.de/security-advisories/usd-2019-0046/
• https://github.com/PHPOffice/PhpSpreadsheet/pull/1041
• https://github.com/PHPOffice/PhpSpreadsheet/commit/0e6238c69e863b58aeece61e48ea032696c6dccd
• https://github.com/FriendsOfPHP/security-advisories/blob/master/phpoffice/phpspreadsheet/CVE-2019-12331.yaml
• https://github.com/advisories/GHSA-vvwv-h69m-wg6f

Repository: https://github.com/PHPOffice/PhpSpreadsheet
Blast Radius: 37.9

Affected Packages