CVE-2018-2477 in Knowledge Management
Summary
by MITRE
Knowledge Management (XMLForms) in SAP NetWeaver, versions 7.30, 7.31, 7.40 and 7.50 does not sufficiently validate an XML document accepted from an untrusted source.
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Analysis
by VulDB Data Team • 04/12/2020
The vulnerability identified as CVE-2018-2477 resides within SAP NetWeaver's Knowledge Management component, specifically in the XMLForms functionality that processes XML documents. This flaw manifests in versions 7.30, 7.31, 7.40, and 7.50 of the SAP NetWeaver platform, representing a critical security oversight that affects organizations relying on knowledge management capabilities within their enterprise systems. The vulnerability stems from insufficient validation mechanisms when processing XML documents sourced from untrusted entities, creating a pathway for malicious actors to exploit the system through crafted XML inputs.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation, and represents a classic example of XML external entity processing issues that have plagued enterprise systems for years. When the XMLForms component receives an XML document from an untrusted source, it fails to adequately sanitize or validate the document structure, allowing potentially malicious XML content to bypass security controls. This weakness enables attackers to manipulate the XML processing pipeline in ways that could lead to unauthorized access, data manipulation, or system compromise. The vulnerability specifically impacts the XML parsing and validation logic within the Knowledge Management module, where XML documents are processed for knowledge base content management and form handling.
The operational impact of this vulnerability extends beyond simple data integrity concerns, as it creates potential attack vectors that could be leveraged for privilege escalation and lateral movement within SAP environments. Attackers could craft malicious XML documents that exploit the insufficient validation to execute arbitrary code, access sensitive data, or disrupt knowledge management services. The implications are particularly severe in enterprise environments where SAP NetWeaver serves as a core platform for business operations, as compromise of the knowledge management system could affect access to critical business information, document repositories, and form processing capabilities. This vulnerability affects the confidentiality, integrity, and availability of knowledge management data within SAP systems, potentially exposing organizations to regulatory compliance violations and business disruption.
Organizations should implement immediate mitigations including applying the relevant SAP security patches and updates released to address this vulnerability, as well as implementing network segmentation and access controls to limit exposure. The ATT&CK framework categorizes this vulnerability under T1210 - Exploitation of Remote Services, where attackers could leverage XML injection techniques to compromise SAP systems. Additional defensive measures include implementing XML schema validation, restricting XML document sources, and monitoring for suspicious XML processing activities. Security teams should also consider implementing Web Application Firewalls and XML validation rules to prevent malformed XML content from reaching the vulnerable components. The vulnerability highlights the importance of proper input validation in enterprise systems and demonstrates the critical need for organizations to maintain up-to-date security patches and configurations to protect against known vulnerabilities in complex enterprise platforms.