CVE-2018-20596 in XCMS
Summary
by MITRE
Jspxcms v9.0.0 allows SSRF.
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Analysis
by VulDB Data Team • 04/25/2020
The vulnerability identified as CVE-2018-20596 represents a server-side request forgery flaw within Jspxcms version 9.0.0, a content management system widely used for web publishing and management. This vulnerability arises from insufficient validation of user-supplied input parameters that are subsequently used to construct HTTP requests to remote servers. The flaw enables malicious actors to manipulate the application's request handling mechanisms, potentially allowing unauthorized access to internal network resources that would normally be protected from external exposure.
The technical implementation of this SSRF vulnerability stems from improper sanitization and validation of input data within the application's request processing components. When Jspxcms processes user-provided URLs or endpoints, it fails to adequately verify the legitimacy of these inputs, creating an opportunity for attackers to inject malicious URLs that point to internal systems. This weakness directly aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to properly validate external resource requests. The vulnerability manifests when the application accepts user input without proper validation, allowing arbitrary URLs to be processed and executed by the server's network stack.
The operational impact of this vulnerability extends beyond simple data theft, as it can enable attackers to perform reconnaissance on internal network infrastructure, access sensitive internal services, and potentially escalate privileges within the affected environment. Attackers can leverage this flaw to target internal systems such as database servers, application servers, or other network services that are typically not directly accessible from the internet. This capability significantly increases the attack surface and can lead to comprehensive system compromise, particularly when internal services are not adequately protected by firewalls or other network segmentation controls. The vulnerability can be exploited through various attack vectors including direct URL manipulation, file inclusion attacks, or by crafting malicious requests that bypass normal access controls.
Mitigation strategies for this SSRF vulnerability should prioritize immediate patching of the Jspxcms application to the latest version that addresses the identified flaw. Organizations should implement strict input validation mechanisms that filter and sanitize all user-supplied URLs, ensuring that only predetermined, trusted domains or IP addresses are permitted for external requests. Network-level controls including firewall rules and proxy configurations should be implemented to restrict outbound connections from the application server to only necessary external endpoints. Additionally, implementing proper access controls and privilege separation within the application can limit the potential damage from successful exploitation attempts. Security monitoring should be enhanced to detect unusual patterns of outbound network requests that may indicate exploitation attempts. The vulnerability's classification under ATT&CK technique T1071.004 for application layer protocol manipulation further emphasizes the need for comprehensive network traffic inspection and validation of all external resource access patterns within the affected environment.