CVE-2018-1311 in JD Edwards EnterpriseOne Tools
Summary
by MITRE
The Apache Xerces-C 3.0.0 to 3.2.3 XML parser contains a use-after-free error triggered during the scanning of external DTDs. This flaw has not been addressed in the maintained version of the library and has no current mitigation other than to disable DTD processing. This can be accomplished via the DOM using a standard parser feature, or via SAX using the XERCES_DISABLE_DTD environment variable.
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Analysis
by VulDB Data Team • 01/23/2025
The vulnerability identified as CVE-2018-1311 represents a critical use-after-free error within the Apache Xerces-C XML parser library, affecting versions ranging from 3.0.0 through 3.2.3. This flaw exists in the parser's handling of external Document Type Definitions and poses significant security implications for any application that processes untrusted XML content. The vulnerability stems from improper memory management during the parsing of external DTDs, where freed memory locations are subsequently accessed, creating opportunities for arbitrary code execution or system compromise. The issue is particularly concerning because XML parsers are fundamental components in numerous applications and systems, making this vulnerability widespread in scope and impact.
The technical nature of this vulnerability aligns with CWE-416, which describes the use of freed memory condition where a program continues to reference memory that has already been freed. This specific flaw occurs during the scanning process of external DTDs, where the parser's internal state management fails to properly handle memory deallocation and subsequent access patterns. The parser's implementation does not adequately validate or sanitize external DTD references, allowing attackers to craft malicious XML documents that trigger the use-after-free condition. When the parser encounters such malformed external DTD content, it executes code that leads to memory corruption, potentially enabling attackers to execute arbitrary code with the privileges of the affected application.
From an operational perspective, this vulnerability creates a substantial risk for organizations utilizing Apache Xerces-C in their applications, particularly those that process external XML content or user-provided data. The attack vector requires the target application to parse XML documents containing external DTD references, which is common in web applications, enterprise systems, and middleware components. The vulnerability can be exploited through various attack methods including XML External Entity (XXE) attacks, where attackers craft malicious XML payloads that trigger the use-after-free condition. This exploitation can lead to complete system compromise, data exfiltration, or denial of service conditions depending on the specific implementation and environment. The lack of a direct patch for this vulnerability means that affected systems remain at risk until the underlying issue is resolved through code modifications or complete disabling of DTD processing.
The recommended mitigations for CVE-2018-1311 primarily focus on disabling DTD processing entirely, which aligns with defensive security practices outlined in the ATT&CK framework under the technique of reducing attack surface. Organizations should implement the DOM parser feature to disable DTD processing or utilize the XERCES_DISABLE_DTD environment variable for SAX-based applications. These approaches effectively neutralize the vulnerability by preventing the parser from processing external DTD content that triggers the memory management error. Additional defensive measures include implementing strict XML input validation, employing XML schema validation, and applying network-level restrictions to prevent access to external DTD resources. The vulnerability demonstrates the importance of proper memory management in security-critical components and highlights the necessity of regular security updates and patches for widely-used libraries. Security teams should also consider implementing monitoring and detection mechanisms to identify potential exploitation attempts and ensure that all affected systems have been properly mitigated according to the established security controls and best practices.