CVE-2017-12637 in NetWeaver AS JAVA
Summary
by MITRE
Directory traversal vulnerability in scheduler/ui/js/ffffffffbca41eb4/UIUtilJavaScriptJS in SAP NetWeaver Application Server Java 7.5 allows remote attackers to read arbitrary files via a .. (dot dot) in the query string, as exploited in the wild in August 2017.
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Analysis
by VulDB Data Team • 03/29/2025
The vulnerability CVE-2017-12637 represents a critical directory traversal flaw within SAP NetWeaver Application Server Java version 7.5 that exposes the scheduler component to remote exploitation. This weakness resides in the UIUtilJavaScriptJS module located at scheduler/ui/js/ffffffffbca41eb4/UIUtilJavaScriptJS, where improper input validation allows attackers to manipulate query string parameters containing directory traversal sequences. The vulnerability specifically leverages the .. (dot dot) notation to navigate outside the intended directory structure and access arbitrary files on the server filesystem. This issue was actively exploited in the wild during August 2017, demonstrating its real-world impact and the urgency of addressing such security gaps in enterprise application servers.
The technical implementation of this vulnerability stems from insufficient sanitization of user-supplied input within the web interface component of SAP NetWeaver. When the application processes query parameters containing directory traversal sequences, it fails to properly validate or filter these inputs before using them in file system operations. This allows attackers to construct malicious URLs that, when processed by the vulnerable component, result in unauthorized file access. The flaw operates at the application layer and requires no authentication to exploit, making it particularly dangerous as it can be leveraged by anyone with network access to the affected system. The vulnerability directly maps to CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which is a well-documented weakness in software security practices. The attack pattern aligns with ATT&CK technique T1083 - File and Directory Discovery, where adversaries enumerate system resources to identify valuable data for further exploitation.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with access to sensitive system files that may contain configuration data, credentials, or application logic that could facilitate further compromise. Attackers can potentially access application source code, configuration files, database connection details, and other sensitive artifacts that could be used for privilege escalation or lateral movement within the network. The vulnerability affects the entire SAP NetWeaver Java application server ecosystem and could impact organizations relying on the scheduler component for business-critical processes. The fact that this vulnerability was exploited in the wild during August 2017 indicates that it was actively targeted by threat actors, suggesting that organizations running affected versions were at significant risk of data breaches or system compromise. The impact is particularly severe for organizations that do not maintain current security patches or have inadequate network segmentation to isolate critical application servers.
Organizations should immediately apply the relevant security patches provided by SAP to address this vulnerability and ensure that all SAP NetWeaver Java components are updated to versions that include proper input validation and sanitization measures. Network segmentation should be implemented to limit access to the affected application server, and access controls should be strengthened to prevent unauthorized access to the scheduler component. Additionally, organizations should implement web application firewalls to detect and block malicious directory traversal attempts in query strings. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other application components, and input validation should be enhanced across all web interfaces to prevent similar issues from occurring. The vulnerability highlights the importance of proper secure coding practices and input validation, particularly in enterprise application servers where the impact of security flaws can be extensive and far-reaching.