CVE Vulnerability

CVE-2019-12331

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.

6.8 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 6.4

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

Scope

8.8 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://herolab.usd.de/security-advisories/usd-2019-0046/ Exploit Third Party Advisory
https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#180---2019-07-01 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:phpspreadsheet_project:phpspreadsheet:*:*:*:*:*:*:*:*
Information

Published : 2019-11-07 03:15

Updated : 2020-02-10 09:49

NVD link : CVE-2019-12331

Mitre link : CVE-2019-12331

Products Affected
No products.
CWE
CWE-611

Improper Restriction of XML External Entity Reference