CVE-2019-12331

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

PHPOffice PhpSpreadsheet anterior a la versión 1.8.0 tiene un problema XXE. El XmlScanner decodifica la sheet1.xml de un .xlsx a utf-8 si en el encabezado se declara algo más que UTF-8. Esta fue una medida de seguridad para evitar CVE-2018-19277, pero la solución no es suficiente. Al codificar dos veces la carga útil xml a utf-7, es posible omitir la comprobación de la cadena ‚

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-05-27 CVE Reserved
2019-11-07 CVE Published
2023-03-12 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-611: Improper Restriction of XML External Entity Reference

CAPEC

References (2)

URL	Tag	Source
https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01	Third Party Advisory

URL	Date	SRC
https://herolab.usd.de/security-advisories/usd-2019-0046	2024-08-04

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Phpspreadsheet Project Search vendor "Phpspreadsheet Project"		Phpspreadsheet Search vendor "Phpspreadsheet Project" for product "Phpspreadsheet"				< 1.8.0 Search vendor "Phpspreadsheet Project" for product "Phpspreadsheet" and version " < 1.8.0"		-		Affected