Description
PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0, the SpreadsheetML XML reader (Reader\Xml) does not validate the ss:Index row attribute against the maximum allowed row count (AddressRange::MAX_ROW = 1,048,576). An attacker can craft a SpreadsheetML XML file with ss:Index="999999999" on a <Row> element, which inflates the internal cachedHighestRow to ~1 billion. Any subsequent call to getRowIterator() without an explicit end row will attempt to iterate ~1 billion rows, causing CPU exhaustion and denial of service. This vulnerability is fixed in 1.30.4, 2.1.16, 2.4.5, 3.10.5, and 5.7.0.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- PHPOffice / PhpSpreadsheet< 1.30.4 – < 1.30.4
- PHPOffice / PhpSpreadsheet>= 2.0.0, < 2.1.16 – >= 2.0.0, < 2.1.16
- PHPOffice / PhpSpreadsheet>= 2.2.0, < 2.4.5 – >= 2.2.0, < 2.4.5
- PHPOffice / PhpSpreadsheet>= 3.3.0, < 3.10.5 – >= 3.3.0, < 3.10.5
- PHPOffice / PhpSpreadsheet>= 4.0.0, < 5.7.0 – >= 4.0.0, < 5.7.0