CVE-2020-4772 in Curam Social Program Management
Summary
by MITRE • 10/12/2020
An XML External Entity Injection (XXE) vulnerability may impact IBM Curam Social Program Management 7.0.9 and 7.0.10. A remote attacker could exploit this vulnerability to expose sensitive information, denial of service, server side request forgery or consume memory resources. IBM X-Force ID: 189150.
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Analysis
by VulDB Data Team • 11/18/2020
The vulnerability identified as CVE-2020-4772 represents a critical XML External Entity Injection flaw within IBM Curam Social Program Management versions 7.0.9 and 7.0.10. This XXE vulnerability stems from the application's insufficient validation of XML input processing, creating a pathway for malicious actors to manipulate the XML parser behavior. The flaw exists in the system's handling of external entities within XML documents, allowing unauthorized access to internal resources and potentially enabling arbitrary code execution. The vulnerability is classified under CWE-611 as an Improper Restriction of XML External Entity Reference, which directly maps to the ATT&CK technique T1213.002 for Data from Information Repositories. The affected IBM Curam Social Program Management platform processes XML data from various sources including user inputs, external feeds, and integration points, making it susceptible to exploitation through crafted XML payloads.
Remote exploitation of this XXE vulnerability presents multiple attack vectors that can severely compromise system integrity and availability. An attacker can leverage the flaw to perform server-side request forgery attacks by crafting malicious XML documents that reference external resources, potentially enabling access to internal network services or databases. The vulnerability also facilitates information disclosure attacks where sensitive data from the server's file system or internal memory structures can be retrieved through entity expansion techniques. Additionally, the flaw can be weaponized for denial of service conditions by triggering excessive memory consumption through recursive entity references or by consuming system resources through repeated processing of malformed XML content. The memory exhaustion capabilities align with ATT&CK technique T1499.004 for Network Denial of Service, while the information disclosure aspects correspond to T1567.002 for Exfiltration Over Web Service.
The operational impact of CVE-2020-4772 extends beyond immediate security breaches to encompass broader business continuity and compliance concerns. Organizations utilizing affected IBM Curam Social Program Management versions face potential exposure of confidential social program data, including personal information of beneficiaries and sensitive administrative records. The vulnerability's potential for denial of service operations could disrupt critical social services, affecting vulnerable populations who rely on these programs for essential support. System administrators must consider the implications for audit trails and forensic investigations, as the vulnerability could be used to manipulate or destroy log data. The attack surface includes any component that processes XML input, particularly those handling integration with external systems, user submissions, or automated data feeds, making comprehensive vulnerability assessment essential for proper risk mitigation.
Mitigation strategies for CVE-2020-4772 require immediate implementation of XML parser configuration changes and input validation controls. Organizations should disable external entity resolution in all XML parsers used by the affected IBM Curam platform, implementing strict XML schema validation to prevent processing of unauthorized entity references. The recommended approach includes configuring XML parsers to reject external DTD declarations and entity references, effectively neutralizing the XXE attack vector. Network segmentation and firewall rules should be implemented to restrict access to the affected application from untrusted networks, while input sanitization measures should be enhanced to validate and filter all XML content before processing. IBM has released patches and updates for affected versions, and organizations should prioritize applying these security fixes as part of their vulnerability management program. Additional protective measures include implementing web application firewalls to detect and block malicious XML payloads, conducting regular security testing of XML processing components, and establishing monitoring procedures to detect unusual patterns of XML processing that may indicate exploitation attempts. The remediation process should also include comprehensive staff training on secure coding practices and awareness of XXE attack patterns to prevent future vulnerabilities in custom integrations or extensions.