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Vulnerability · Published Nov 18, 2024 · Assigned by GitHub_M

CVE-2024-47873PhpSpreadsheet XmlScanner bypass leads to XXE

High 7.5

In plain English

A high-severity XML external entity in PhpSpreadsheet from PHPOffice. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 44.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The XmlScanner class has a scan method which should prevent XXE attacks. However, prior to versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0, the regexes used in the `scan` method and the findCharSet method can be bypassed by using UCS-4 and encoding guessing. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Packagistphpoffice/phpexcelno fix listedGHSA-jw4x-v69f-hh5w
Packagistphpoffice/phpspreadsheet1.29.4GHSA-jw4x-v69f-hh5w
Packagistphpoffice/phpspreadsheet2.1.3GHSA-jw4x-v69f-hh5w
Packagistphpoffice/phpspreadsheet2.3.2GHSA-jw4x-v69f-hh5w
Packagistphpoffice/phpspreadsheet3.4.0GHSA-jw4x-v69f-hh5w

Affected products (as reported)

VendorProductVersions
PHPOffice PhpSpreadsheet < 1.29.4>= 2.0.0, < 2.1.3>= 2.2.0, < 2.3.2>= 3.3.0, < 3.4.0

Weakness: CWE-611 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References