CVE-2020-5003 in Financial Transaction Manager
Summary
by MITRE • 06/11/2021
IBM Financial Transaction Manager 3.2.4 is vulnerable to an XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 192956.
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Analysis
by VulDB Data Team • 06/13/2021
The vulnerability identified as CVE-2020-5003 affects IBM Financial Transaction Manager version 3.2.4, representing a critical XML External Entity Injection flaw that exposes the system to significant security risks. This vulnerability falls under the Common Weakness Enumeration category CWE-611, which specifically addresses improper restriction of XML external entities, making it a well-documented and dangerous class of vulnerability in web applications and enterprise systems. The flaw manifests when the application processes XML data without proper validation or sanitization of external entity references, creating an attack surface that can be exploited by malicious actors to gain unauthorized access to system resources and sensitive data.
The technical implementation of this vulnerability allows remote attackers to craft malicious XML payloads that, when processed by the affected IBM Financial Transaction Manager, trigger unintended behavior within the application's XML parser. The XXE injection occurs at the parser level where external entity references are resolved without adequate restrictions, enabling attackers to reference external resources or perform server-side request forgery attacks. This vulnerability specifically impacts the processing of XML data within the financial transaction management system, potentially allowing attackers to access internal network resources, read local files, or consume excessive memory resources through malicious entity expansion attacks. The attack vector is particularly dangerous as it requires no authentication and can be executed remotely against the vulnerable system.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can lead to significant resource exhaustion and potential denial of service conditions within the financial transaction processing environment. Attackers leveraging this vulnerability can consume substantial memory resources through malicious XML entity expansion, potentially causing system instability or complete service disruption. The financial implications are severe given that this affects a transaction management system, where unauthorized access to sensitive financial data or disruption of transaction processing could result in substantial monetary losses and regulatory compliance violations. The vulnerability also creates opportunities for attackers to escalate privileges or move laterally within the network infrastructure, particularly in environments where the financial transaction manager interfaces with other critical systems.
Organizations should implement immediate mitigations including disabling external entity resolution in XML parsers, implementing strict input validation for all XML data processing, and applying the vendor-provided security patches as soon as they become available. The mitigation strategy should follow established security frameworks such as the ATT&CK technique T1213.002 for data from information repositories, ensuring that XML processing components are hardened against external entity references. Network segmentation and firewall rules should be configured to restrict access to the vulnerable system, while monitoring solutions should be deployed to detect anomalous XML processing patterns that might indicate exploitation attempts. Regular security assessments and penetration testing should be conducted to verify that the implemented mitigations are effective and that no other similar vulnerabilities exist within the broader system architecture.