CVE-2018-2406 in Crystal Reports Server
Summary
by MITRE
Unquoted windows search path (directory/path traversal) vulnerability in Crystal Reports Server, OEM Edition (CRSE), 4.0, 4.10, 4.20, 4.30, startup path.
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Analysis
by VulDB Data Team • 02/27/2023
The vulnerability identified as CVE-2018-2406 represents a critical unquoted search path weakness in SAP Crystal Reports Server OEM Edition versions 4.0 through 4.30. This flaw manifests in the application's startup path handling mechanism where the system fails to properly quote directory paths during the search process. The vulnerability stems from the Windows operating system's default behavior of searching directories in the PATH environment variable without requiring explicit quotation marks, creating opportunities for malicious actors to inject arbitrary code. When applications execute with unquoted paths, the operating system will first search for executables in the root of the specified path, and if no executable exists there, it will proceed to search subdirectories. This creates a race condition where attackers can place malicious binaries in directories with the same name as the expected application components, leading to privilege escalation and code execution. The vulnerability falls under the CWE-177 weakness category, specifically addressing improper handling of unquoted search paths, which is a well-documented security risk in Windows environments. The ATT&CK framework categorizes this as a privilege escalation technique through path manipulation, where adversaries exploit the operating system's search order to execute malicious code with elevated privileges.
The technical exploitation of this vulnerability requires an attacker to gain access to a system with sufficient privileges to modify the PATH environment variable or place malicious executables in strategic locations within the search path. The impact extends beyond simple code execution to include potential system compromise and data exfiltration capabilities. The affected Crystal Reports Server OEM Edition versions are particularly vulnerable because they do not properly validate or sanitize the startup paths during initialization, allowing attackers to manipulate the execution flow. This weakness is particularly dangerous in enterprise environments where Crystal Reports servers often run with elevated privileges and have access to sensitive business data. The vulnerability can be exploited through various attack vectors including social engineering, where attackers convince legitimate users to execute modified binaries, or through direct system compromise where attackers have already gained access to the target system. The lack of proper input validation and path sanitization in the application's startup routine creates a persistent security gap that remains exploitable until the underlying software is patched or the configuration is corrected.
Organizations affected by this vulnerability should implement immediate mitigations including updating to the latest available patches from SAP, which address the unquoted search path issue by properly quoting all directory paths during the startup process. System administrators should also review and harden the PATH environment variables to remove unnecessary or untrusted directories, particularly those that may be writable by unprivileged users. The implementation of application whitelisting solutions can provide additional protection by restricting execution of unauthorized binaries, even if an attacker manages to place malicious code in a search path directory. Network segmentation and privilege separation should be enforced to limit the potential impact of successful exploitation, ensuring that Crystal Reports services do not run with unnecessary administrative privileges. Additionally, regular security audits should be conducted to identify and remediate any other instances of unquoted search paths within the enterprise environment. The vulnerability demonstrates the importance of secure coding practices and proper input validation, as outlined in the OWASP Top Ten and NIST cybersecurity guidelines, which emphasize the need for robust path handling mechanisms to prevent such privilege escalation attacks. Organizations should also consider implementing automated monitoring solutions that can detect anomalous execution patterns or unauthorized modifications to system paths, providing early warning capabilities for potential exploitation attempts.