CVE-2016-3674 in Utilities Framework
Summary
by MITRE
Multiple XML external entity (XXE) vulnerabilities in the (1) Dom4JDriver, (2) DomDriver, (3) JDomDriver, (4) JDom2Driver, (5) SjsxpDriver, (6) StandardStaxDriver, and (7) WstxDriver drivers in XStream before 1.4.9 allow remote attackers to read arbitrary files via a crafted XML document.
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Analysis
by VulDB Data Team • 05/23/2025
The vulnerability identified as CVE-2016-3674 represents a critical XML external entity processing flaw affecting multiple XML parsing drivers within the XStream library. This vulnerability impacts versions of XStream prior to 1.4.9 and affects seven distinct XML drivers including Dom4JDriver, DomDriver, JDomDriver, JDom2Driver, SjsxpDriver, StandardStaxDriver, and WstxDriver. The flaw stems from insufficient input validation during XML document processing, creating a pathway for remote attackers to exploit the system through carefully crafted XML payloads. The vulnerability is categorized under CWE-611, which specifically addresses improper restriction of XML external entity reference, making it a direct descendant of the well-known XXE attack vector that has plagued XML processing systems for years. Attackers can leverage this vulnerability to perform unauthorized file access operations, potentially leading to data exfiltration, system compromise, or further escalation within the affected environment.
The technical exploitation of this vulnerability occurs when XStream processes XML documents containing malicious external entity declarations. When any of the affected drivers encounter XML content that includes external entity references pointing to local files or network resources, the system will attempt to resolve these entities, thereby reading arbitrary files from the server's file system. This occurs because the XML parsers used by these drivers do not properly restrict or disable external entity resolution by default. The attack vector is particularly dangerous because it can be executed remotely without requiring authentication, and the malicious XML payload can be constructed to access sensitive files such as configuration files, database credentials, system files, or application data. The vulnerability essentially bypasses normal access controls and allows attackers to retrieve content that should remain restricted.
The operational impact of CVE-2016-3674 extends beyond simple data theft, as it can enable more sophisticated attack chains within affected systems. Organizations using vulnerable versions of XStream in their applications become susceptible to information disclosure attacks that could expose sensitive business data, user credentials, or system configurations. The vulnerability is particularly concerning in environments where XStream is used to process untrusted XML input from web services, APIs, or user uploads. Security professionals should note that this vulnerability maps directly to ATT&CK technique T1566.001, which covers the use of malicious external entities in XML processing. The attack can potentially lead to privilege escalation if the target system has access to sensitive files with elevated permissions, and in some cases may enable further exploitation such as command execution through file inclusion vulnerabilities. This makes the vulnerability a prime target for attackers seeking to establish persistent access or conduct advanced persistent threats.
Mitigation strategies for CVE-2016-3674 center around updating to XStream version 1.4.9 or later, which includes proper protections against external entity resolution. Organizations should also implement XML parser configuration changes to disable external entity processing entirely, particularly in applications that process untrusted XML input. The recommended approach involves configuring the XML parsers to reject external entity declarations and DTD (Document Type Definition) processing. Security teams should conduct thorough vulnerability assessments to identify all applications using affected XStream versions and ensure proper patching across the entire application portfolio. Additional defensive measures include implementing network segmentation, monitoring for unusual file access patterns, and deploying web application firewalls that can detect and block malicious XML payloads. Organizations should also consider implementing proper input validation and sanitization mechanisms for all XML processing components, following industry best practices outlined in OWASP XML Security guidelines and ensuring that XML parsers are configured with the principle of least privilege.