CVE-2025-48882 in Math
Summary
by MITRE • 05/30/2025
PHPOffice Math is a library that provides a set of classes to manipulate different formula file formats. Prior to version 0.3.0, loading XML data using the standard `libxml` extension and the `LIBXML_DTDLOAD` flag without additional filtration, leads to XXE. Version 0.3.0 fixes the vulnerability.
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Analysis
by VulDB Data Team • 06/02/2025
The vulnerability identified as CVE-2025-48882 affects PHPOffice Math, a library designed for manipulating various formula file formats within PHP applications. This library leverages the standard libxml extension to process XML data, creating a potential security risk that could be exploited by malicious actors. The flaw exists in versions prior to 0.3.0 where the library fails to implement proper input validation and sanitization when handling XML content, specifically when the LIBXML_DTDLOAD flag is utilized during XML parsing operations.
The technical implementation of this vulnerability stems from the library's reliance on libxml's XML parsing capabilities without adequate protection against external entity resolution. When the LIBXML_DTDLOAD flag is enabled, it allows the parser to load external document type definitions, which creates an attack surface for XML External Entity exploitation. This configuration permits attackers to craft malicious XML payloads that can reference external resources or execute arbitrary code on the server hosting the vulnerable application. The vulnerability directly maps to CWE-611, which categorizes insecure direct object references and specifically addresses XML external entity processing flaws that can lead to information disclosure, denial of service, or remote code execution.
The operational impact of this vulnerability extends beyond simple data manipulation, as it can potentially allow attackers to access sensitive server resources, perform unauthorized data exfiltration, or even achieve remote code execution depending on the server environment and configuration. Applications using PHPOffice Math to process user-provided or untrusted formula files become vulnerable to XXE attacks that could compromise the entire system. The attack vector typically involves crafting specially formatted XML documents that contain external entity declarations, which when processed by the vulnerable library can trigger unintended behavior. This vulnerability aligns with ATT&CK technique T1213.002, which covers data from information repositories, and potentially T1059.007 for command and scripting interpreter usage, depending on the attack implementation.
The fix implemented in version 0.3.0 addresses this vulnerability by introducing proper input filtering and sanitization mechanisms when processing XML data. This update likely involves disabling or properly configuring the LIBXML_DTDLOAD flag, implementing additional XML validation checks, or employing more secure XML parsing approaches that prevent external entity resolution. Organizations should immediately upgrade to version 0.3.0 or later to remediate this vulnerability and ensure that their applications using PHPOffice Math are protected against XXE attacks. System administrators should also consider implementing additional network-level protections and monitoring for suspicious XML processing activities, as well as reviewing other libraries and components that may be similarly vulnerable to XXE attacks. The mitigation strategy should include comprehensive testing of XML processing functionality and validation of input sources to prevent similar vulnerabilities from emerging in other parts of the application stack.