CVE-2015-0194 in Sterling B2B Integrator
Summary
by MITRE
XML External Entity (XXE) vulnerability in IBM Sterling B2B Integrator 5.1 and 5.2 and IBM Sterling File Gateway 2.1 and 2.2 allows remote attackers to read arbitrary files via a crafted XML data.
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Analysis
by VulDB Data Team • 01/07/2021
The CVE-2015-0194 vulnerability represents a critical XML External Entity processing flaw affecting IBM Sterling B2B Integrator versions 5.1 and 5.2, along with IBM Sterling File Gateway versions 2.1 and 2.2. This vulnerability falls under the Common Weakness Enumeration category CWE-611, which specifically addresses improper restriction of XML external entity references. The flaw enables remote attackers to exploit the system by crafting malicious XML data that triggers unauthorized file access patterns. The vulnerability stems from insufficient validation of external entity references within XML processing mechanisms, allowing adversaries to manipulate the parsing behavior and potentially access sensitive system resources.
The technical implementation of this vulnerability occurs when the affected IBM products process XML documents without proper sanitization of external entity declarations. Attackers can construct XML payloads that reference external entities pointing to local files on the server filesystem, enabling arbitrary file read operations. This exploitation vector demonstrates a fundamental flaw in the XML parser configuration where external entity resolution is not properly restricted or disabled. The vulnerability specifically impacts the XML processing components within these enterprise integration platforms, which are designed to handle complex data transformations and business-to-business communications. The flaw exists in the core XML parsing libraries that these products utilize, making it particularly dangerous as it affects the foundational data processing capabilities.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can lead to complete system compromise when combined with other attack vectors. Remote attackers can leverage this XXE vulnerability to access sensitive configuration files, authentication credentials, and business data stored on the affected systems. The implications are severe for organizations relying on these integration platforms, as they typically handle critical business data exchanges and may contain proprietary information. According to the MITRE ATT&CK framework, this vulnerability maps to technique T1566.001 for Initial Access through the exploitation of XML external entity vulnerabilities, and can facilitate subsequent techniques such as T1083 for file and directory discovery and T1078 for valid accounts exploitation. Organizations may experience regulatory compliance violations and significant financial losses due to data breaches resulting from this vulnerability.
Mitigation strategies for CVE-2015-0194 should prioritize immediate patching of affected systems with vendor-provided security updates. Organizations must disable external entity resolution in all XML processing components and implement strict XML schema validation to prevent unauthorized entity references. Network segmentation and firewall rules should restrict access to affected systems, while monitoring solutions should be deployed to detect anomalous XML processing patterns. Security teams should conduct comprehensive vulnerability assessments to identify all instances of affected software versions and implement proper input validation controls. The remediation process should include disabling the XML external entity feature entirely within the affected IBM products, as recommended by the vendor security advisories. Additionally, organizations should establish robust configuration management practices to prevent similar vulnerabilities from emerging in other XML processing components throughout their infrastructure.