PT-2019-12758 · Phpoffice · Phpoffice Phpspreadsheet

Daniel Hoffmann · Published 2019-11-07 · Updated 2024-09-04 · CVE-2019-12331

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions PHPOffice PhpSpreadsheet versions prior to 1.8.0

Description The issue arises from the XmlScanner decoding sheet1.xml from an .xlsx file to utf-8 if a different encoding is declared in the header. This was initially intended as a security measure but is insufficient. By double-encoding the xml payload to utf-7, it is possible to bypass the check for the string <!ENTITY and thus allow for an XML external entity processing (XXE) attack.

Recommendations For versions prior to 1.8.0, update to version 1.8.0 or later to resolve the issue. As a temporary workaround, consider restricting the processing of .xlsx files with non-UTF-8 encoding declarations to minimize the risk of exploitation.

Exploit

Fix

XXE

Weakness Enumeration

CWE-611

Related Identifiers

CVE-2019-12331

GHSA-VVWV-H69M-WG6F

Affected Products

Phpoffice Phpspreadsheet

References · 10

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