CVE-2024-51453 in Sterling Secure Proxy
Summary
by MITRE • 05/28/2025
IBM Sterling Secure Proxy 6.2.0.0 through 6.2.0.1 could allow a remote attacker to traverse directories on the system. An attacker could send a specially crafted URL request containing "dot dot" sequences (/../) to view arbitrary files on the system.
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Analysis
by VulDB Data Team • 05/28/2025
IBM Sterling Secure Proxy versions 6.2.0.0 through 6.2.0.1 contain a directory traversal vulnerability that enables remote attackers to access arbitrary files on the underlying system. This flaw arises from insufficient input validation when processing URL requests containing directory traversal sequences such as "/../" which allows unauthorized access to files outside the intended directory structure. The vulnerability stems from improper sanitization of user-supplied input in the proxy's request handling mechanism, creating an opportunity for attackers to navigate the file system beyond the designated boundaries. This issue directly maps to CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, a well-documented weakness in software security that specifically addresses inadequate restrictions on file path access. The attack vector requires a remote unauthenticated user to craft malicious URLs that exploit the lack of proper path validation in the application's processing logic. When such requests are processed, the system fails to properly resolve the directory traversal sequences, allowing access to sensitive files that should remain protected within the application's intended scope. The operational impact of this vulnerability is significant as it provides attackers with the ability to retrieve system files, configuration data, and potentially sensitive information that could aid in further exploitation attempts. This vulnerability aligns with ATT&CK technique T1083 - File and Directory Discovery, as it enables adversaries to enumerate file system contents and potentially identify other attack surfaces. The affected IBM Sterling Secure Proxy versions represent a critical security gap that could expose the underlying operating system to unauthorized file access, potentially leading to privilege escalation or information disclosure attacks. Organizations utilizing these proxy versions face increased risk of data breaches and system compromise, particularly in environments where the proxy handles sensitive data or serves as a gateway to internal systems.
The directory traversal vulnerability in IBM Sterling Secure Proxy stems from the application's failure to properly validate and sanitize incoming URL parameters before processing them within the file system context. Attackers can exploit this weakness by constructing HTTP requests that include multiple directory traversal sequences, effectively bypassing normal access controls and gaining access to files outside the intended application directory. This type of vulnerability is particularly dangerous because it can be exploited without authentication, making it an attractive target for automated scanning tools and malicious actors seeking to gather information about the target system. The flaw exists at the application layer where user input is directly incorporated into file system operations without proper validation or canonicalization. The security implications extend beyond simple file access as the ability to traverse directories may enable attackers to access configuration files, log files, or other sensitive system artifacts that could reveal system architecture details or credentials. This vulnerability represents a classic example of insufficient input validation that allows attackers to manipulate the intended execution flow of the application. The impact is particularly severe in enterprise environments where Sterling Secure Proxy may be used to protect sensitive data flows, as successful exploitation could lead to complete system compromise or unauthorized access to protected resources.
Mitigation strategies for this directory traversal vulnerability in IBM Sterling Secure Proxy should prioritize immediate remediation through official IBM security patches and updates. Organizations must ensure that all affected systems are updated to versions that contain proper input validation and sanitization mechanisms to prevent directory traversal sequences from being processed within the file system context. Network segmentation and firewall rules should be implemented to restrict access to the proxy service to only authorized users and systems, reducing the attack surface available to potential attackers. Input validation should be strengthened at multiple layers including application-level sanitization of URL parameters and implementation of proper path canonicalization routines that prevent the interpretation of directory traversal sequences. Security monitoring should be enhanced to detect and alert on suspicious URL patterns containing traversal sequences, enabling rapid response to potential exploitation attempts. Additionally, organizations should implement principle of least privilege access controls and regularly audit file system access patterns to identify any unauthorized access attempts. The vulnerability highlights the importance of proper secure coding practices and input validation, particularly in applications that handle user-supplied data and perform file system operations. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other applications and systems within the organization's infrastructure. This vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and implementing comprehensive security controls that address both application-level and network-level threats.