CVE-2025-68280: Apache SIS XXE Vulnerability

CVE-2025-68280 Overview

CVE-2025-68280 is an XML External Entity (XXE) vulnerability in Apache SIS, a Java library for developing geospatial applications. The vulnerability allows attackers to craft malicious XML files that, when parsed by Apache SIS, can expose the contents of local files on the server. This type of vulnerability enables information disclosure through the exploitation of XML parsers that process external entity references without proper restrictions.

The vulnerability impacts several critical SIS services including reading of GeoTIFF files with GEO_METADATA tags defined by the Defense Geospatial Information Working Group (DGIWG), parsing of ISO 19115 metadata in XML format, parsing of Coordinate Reference Systems defined in GML format, and parsing of GPS Exchange Format (GPX) files.

Critical Impact

Attackers can exfiltrate sensitive local files from servers running vulnerable Apache SIS versions by exploiting improper XML parsing configurations, potentially exposing configuration files, credentials, and other sensitive data.

Affected Products

• Apache SIS versions 0.4 through 1.5
• Applications using Apache SIS for GeoTIFF, ISO 19115, GML, or GPX file parsing
• Geospatial services and applications built on vulnerable Apache SIS versions

Discovery Timeline

• 2026-01-05 - CVE CVE-2025-68280 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-68280

Vulnerability Analysis

This XXE vulnerability (CWE-611) exists due to improper restriction of XML external entity references during the parsing of various geospatial file formats. When Apache SIS processes XML content from GeoTIFF files, ISO 19115 metadata, GML coordinate reference systems, or GPX files, it fails to properly disable external entity processing. This allows an attacker to include external entity declarations in malicious XML that reference local files on the server.

The vulnerability is particularly concerning in geospatial applications where data is frequently exchanged between organizations and systems, as attackers could embed malicious payloads within seemingly legitimate geographic data files.

Root Cause

The root cause is the lack of secure XML parser configuration in Apache SIS's file handling routines. The XML parsers used by SIS do not have external DTD and entity processing disabled by default, which is a well-known security best practice for preventing XXE attacks. When parsing user-supplied or external XML content, the parser processes external entity declarations, allowing file content to be included in error messages or processing output.

Attack Vector

The attack is network-based and requires user interaction, as a victim must parse a maliciously crafted file. An attacker prepares a specially crafted XML file containing external entity declarations that reference sensitive files such as /etc/passwd or application configuration files. When a vulnerable Apache SIS instance processes this file, the XML parser retrieves the contents of the referenced files and includes them in the parsed data, which may then be disclosed to the attacker through application responses or error messages.

Attack scenarios include:

• Uploading malicious GeoTIFF files with crafted GEO_METADATA tags to geospatial platforms
• Submitting malicious ISO 19115 metadata to geographic data processing services
• Providing crafted GML or GPX files to mapping or GPS applications

The vulnerability can be exploited by crafting XML documents with external entity declarations that reference file:// URIs pointing to local system files. When the vulnerable Apache SIS instance parses such content, the XML processor attempts to resolve these entities, resulting in the disclosure of local file contents. For detailed technical information, see the Apache Mailing List Discussion.

Detection Methods for CVE-2025-68280

Indicators of Compromise

• Unusual XML parsing errors in Apache SIS logs containing file path references
• Application logs showing attempts to access sensitive system files like /etc/passwd, /etc/shadow, or application configuration files
• Incoming requests or file uploads containing XML with <!DOCTYPE> declarations and external entity references
• Outbound data transfers containing unexpected system file contents

Detection Strategies

• Monitor Apache SIS application logs for XML parsing exceptions or errors mentioning file access
• Implement Web Application Firewall (WAF) rules to detect XXE patterns in uploaded files including <!ENTITY declarations
• Deploy file upload scanning to detect malicious XML constructs in GeoTIFF, GML, GPX, and ISO 19115 files
• Use runtime application self-protection (RASP) to detect and block external entity resolution attempts

Monitoring Recommendations

• Enable verbose logging for Apache SIS file parsing operations to capture potential exploitation attempts
• Configure alerting for XML parser errors that reference local file paths or external DTD loading
• Monitor network traffic for unusual data exfiltration patterns following geospatial file uploads
• Implement integrity monitoring on sensitive configuration files that may be targeted

How to Mitigate CVE-2025-68280

Immediate Actions Required

• Upgrade Apache SIS to version 1.6 or later, which addresses this vulnerability
• Apply the recommended Java system property workaround if immediate upgrade is not possible
• Review and restrict file upload capabilities for geospatial data formats
• Audit existing uploaded files for potential malicious XML content

Patch Information

The Apache SIS development team has released version 1.6 which fixes this XXE vulnerability. Users should upgrade to this version as the primary remediation. For additional technical details, refer to the Apache Mailing List Discussion and Openwall OSS Security Update.

Workarounds

• Launch Java applications with the javax.xml.accessExternalDTD system property set to restrict external DTD access
• Configure XML parsers to disable external entity processing using parser-specific security features
• Implement input validation to strip or reject XML content containing external entity declarations
• Use application-level sandboxing to restrict file system access for XML parsing operations

# Configuration example - Launch Java with XXE protections enabled
java -Djavax.xml.accessExternalDTD="" -jar your-application.jar

# Alternative: Disable external schema access as well
java -Djavax.xml.accessExternalDTD="" -Djavax.xml.accessExternalSchema="" -jar your-application.jar