2024-11-19
Platform: PhpSpreadsheet
Version: All versions before 1.9.4, 2.1.3, 2.3.2, and 3.4.0
Vulnerability: XXE (XML External Entity)
Severity: High
Date: Undisclosed (potentially October 2024 based on CVE assignment trends)
What Undercode Says:
This vulnerability resides in the `XmlScanner` class of PhpSpreadsheet, a library used for reading and writing spreadsheet files. The `scan` method, designed to prevent XXE attacks, has exploitable weaknesses.
Here’s a breakdown:
1. Regex Bypass: The `scan` method uses regexes that can be bypassed using UCS-4 encoding and encoding guessing techniques. This allows attackers to inject malicious code.
2. Encoding Misdetection: The `findCharSet` method used for encoding detection is vulnerable to encodings with more than 8 bits. This is because the regex doesn’t account for null bytes, leading to the library misinterpreting the encoding.
Impact:
An attacker can exploit this vulnerability to launch XXE attacks. This could enable them to:
Steal sensitive data from the system.
Execute arbitrary code on the server.
Take control of the system.
Recommendation:
Upgrade PhpSpreadsheet to versions 1.9.4, 2.1.3, 2.3.2, or 3.4.0 (or later) to address this vulnerability.
References:
Reported By: Github.com
Undercode AI: https://ai.undercodetesting.com
Image Source:
OpenAI: https://openai.com
Undercode AI DI v2: https://ai.undercode.help