CVE-2007-1913 in RFC Library
Summary
by MITRE
The TRUSTED_SYSTEM_SECURITY function in the SAP RFC Library 6.40 and 7.00 before 20061211 allows remote attackers to verify the existence of users and groups on systems and domains via unspecified vectors, a different vulnerability than CVE-2006-6010. NOTE: This information is based upon a vague initial disclosure. Details will be updated after the grace period has ended.
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Analysis
by VulDB Data Team • 10/22/2017
The vulnerability identified as CVE-2007-1913 affects the SAP RFC Library version 6.40 and 7.00 prior to the 20061211 patch release, specifically within the TRUSTED_SYSTEM_SECURITY function. This flaw represents a significant information disclosure vulnerability that enables remote attackers to enumerate user accounts and group memberships across systems and domains without proper authentication. The vulnerability operates through unspecified vectors that have not been fully detailed in the initial disclosure, suggesting a complex attack surface that may involve multiple network protocols or system interfaces. The issue is distinct from CVE-2006-6010, indicating that while both vulnerabilities relate to system security, they affect different components or exploit different attack paths within the SAP ecosystem. This classification aligns with CWE-200, which covers "Information Exposure," and represents a fundamental weakness in the security architecture of the SAP RFC library that undermines the principle of least privilege and system access control.
The technical implementation of this vulnerability stems from improper access control mechanisms within the TRUSTED_SYSTEM_SECURITY function, which should normally enforce strict authentication and authorization checks before allowing system-level queries. However, the flaw allows attackers to bypass these controls and perform reconnaissance activities that reveal the existence of legitimate users and groups within the system. This enumeration capability provides attackers with valuable intelligence for subsequent attacks, as it reveals the structure of the user base and potential target accounts. The vulnerability operates at the application layer and can be exploited over network connections, making it particularly dangerous in environments where SAP systems are exposed to untrusted networks. The unspecified vectors suggest that the vulnerability may be accessible through multiple communication channels or may involve complex interaction patterns with other SAP components, potentially including the use of specific RFC protocol implementations that do not properly validate incoming requests.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with critical reconnaissance data that can be leveraged for more sophisticated attacks. The ability to verify user and group existence enables attackers to craft targeted attacks against specific accounts, potentially leading to credential harvesting, privilege escalation, or social engineering campaigns. This vulnerability particularly affects organizations that rely heavily on SAP systems for business-critical operations, as it exposes the underlying user infrastructure to unauthorized discovery. The risk is amplified when considering that SAP systems often contain sensitive business data and financial information, making the exposure of user accounts particularly concerning from a compliance and regulatory perspective. Organizations may face increased risk of insider threats, targeted credential stuffing attacks, and other exploitation techniques that rely on knowledge of legitimate user accounts within the system.
Mitigation strategies for CVE-2007-1913 should focus on immediate patch deployment to the affected SAP RFC Library versions, with particular attention to the specific 20061211 patch release that addresses this vulnerability. Network segmentation and firewall rules should be implemented to restrict access to SAP systems and limit the attack surface, ensuring that only authorized systems can communicate with SAP RFC services. Access control mechanisms should be strengthened through the implementation of proper authentication protocols and the enforcement of least privilege principles, preventing unauthorized access to system-level functions. Security monitoring should be enhanced to detect unusual enumeration attempts and anomalous access patterns that may indicate exploitation of this vulnerability. Organizations should also consider implementing intrusion detection systems that can identify and alert on suspicious RFC protocol usage patterns. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access and reconnaissance, specifically covering T1078 for valid accounts and T1069 for permission groups, making it a critical target for defensive measures. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within the broader SAP ecosystem and ensure comprehensive protection against related attack vectors.