CVE-2019-3774 in Spring Batch
Summary
by MITRE
Spring Batch versions 3.0.9, 4.0.1, 4.1.0, and older unsupported versions, were susceptible to XML External Entity Injection (XXE) when receiving XML data from untrusted sources.
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Analysis
by VulDB Data Team • 05/03/2020
Spring Batch is a comprehensive batch processing framework designed for enterprise applications that handles large volumes of data through structured batch jobs. The framework provides robust functionality for processing data in batches while maintaining transactional integrity and error handling capabilities. When processing XML data from untrusted sources, Spring Batch applications became vulnerable to XML External Entity Injection attacks due to insufficient input validation and secure XML parsing configurations. This vulnerability specifically affected versions 3.0.9, 4.0.1, 4.1.0, and older unsupported versions, creating a significant security risk for organizations relying on these frameworks for batch processing operations.
The technical flaw stems from the framework's XML parsing implementation which failed to properly restrict external entity resolution when processing XML input. An attacker could craft malicious XML payloads containing external entity references that would be resolved during parsing, potentially leading to information disclosure, denial of service, or server-side request forgery attacks. The vulnerability occurs when the framework uses insecure XML parsers that do not disable external entity resolution by default, allowing attackers to reference external resources through entity declarations. This weakness aligns with CWE-611, which specifically addresses improper restriction of XML external entity references, and represents a classic XXE attack vector that can be exploited to access internal system resources or perform unauthorized operations.
The operational impact of this vulnerability extends beyond simple data processing risks, as it could enable attackers to extract sensitive information from the batch processing environment. Organizations using vulnerable Spring Batch versions may experience unauthorized data access, system resource exhaustion through external entity resolution, or potential privilege escalation if batch jobs execute with elevated permissions. The attack surface is particularly concerning for enterprise environments where batch processing often handles sensitive financial, personal, or proprietary data. Additionally, the vulnerability could facilitate more sophisticated attacks such as blind XXE exploitation, where attackers might use out-of-band communication channels to exfiltrate data without direct response validation. This risk is amplified in environments where batch jobs interact with internal systems or databases without proper access controls.
Mitigation strategies for this vulnerability include upgrading to patched versions of Spring Batch where external entity resolution has been properly disabled in XML parsers. Organizations should also implement secure XML parsing configurations that explicitly disable external entity resolution and DTD processing. The recommended approach involves configuring XML parsers with secure settings that prevent loading of external entities, as outlined in the OWASP XML External Entity Prevention Cheat Sheet. Security teams should also conduct thorough vulnerability assessments to identify all instances of vulnerable Spring Batch versions within their environments and implement network segmentation to limit potential attack vectors. Additionally, input validation should be strengthened to sanitize all XML data received from untrusted sources, and regular security testing should include XXE vulnerability scanning to prevent similar issues in future deployments. The ATT&CK framework categorizes this vulnerability under T1213, which covers data from information repositories, emphasizing the importance of protecting batch processing environments from unauthorized data access through XML injection attacks.