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Vulnerability · Published Nov 18, 2024 · Assigned by GitHub_M

CVE-2024-48917XXE in PHPSpreadsheet's XLSX reader

High 7.5

In plain English

A high-severity XML external entity in PhpSpreadsheet from PHPOffice. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 45.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
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, in a bypass of the previously reported `CVE-2024-47873`, the regexes from the `findCharSet` method, which is used for determining the current encoding can be bypassed by using a payload in the encoding UTF-7, and adding at end of the file a comment with the value `encoding="UTF-8"` with `"`, which is matched by the first regex, so that `encoding='UTF-7'` with single quotes `'` in the XML header is not matched by the second regex. 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-7cc9-j4mv-vcjp
Packagistphpoffice/phpspreadsheet1.29.4GHSA-7cc9-j4mv-vcjp
Packagistphpoffice/phpspreadsheet2.1.3GHSA-7cc9-j4mv-vcjp
Packagistphpoffice/phpspreadsheet2.3.2GHSA-7cc9-j4mv-vcjp
Packagistphpoffice/phpspreadsheet3.4.0GHSA-7cc9-j4mv-vcjp

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