CVE-2019-12994 in AssetExplorer
Summary
by MITRE
Server Side Request Forgery (SSRF) exists in Zoho ManageEngine AssetExplorer version 6.2.0 for the AJaxServlet servlet via a parameter in a URL.
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Analysis
by VulDB Data Team • 11/21/2023
The vulnerability identified as CVE-2019-12994 represents a critical server side request forgery flaw within Zoho ManageEngine AssetExplorer version 6.2.0. This security weakness specifically manifests through the AJaxServlet servlet which processes incoming requests through URL parameters, creating an avenue for malicious actors to manipulate server behavior. The flaw resides in the application's improper validation of user-supplied input, allowing attackers to craft specially formatted requests that can cause the server to make unintended requests to internal or external systems. This vulnerability falls under the Common Weakness Enumeration category CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to properly validate and sanitize input parameters before using them in network requests. The affected AssetExplorer version 6.2.0 demonstrates a classic example of how web applications can inadvertently expose internal network resources when they fail to properly control user input that gets processed by server-side components.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing crafted parameters that are passed to the AJaxServlet endpoint. The servlet processes these parameters without adequate validation, allowing the application to make HTTP requests to arbitrary destinations specified by the attacker. This can result in unauthorized access to internal systems, data exfiltration, or further exploitation of network resources that would normally be protected by firewalls or network segmentation. The attack vector aligns with the MITRE ATT&CK framework's technique T1071.004, which covers application layer protocol usage for command and control communications. The vulnerability essentially allows attackers to bypass normal network security controls by leveraging the legitimate application's network access to probe internal systems, potentially enabling reconnaissance activities that could lead to more severe compromises.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable attackers to perform extensive reconnaissance of internal network infrastructure, access sensitive data stored on internal servers, or even facilitate further attacks through lateral movement. Organizations using Zoho ManageEngine AssetExplorer version 6.2.0 face significant risk of unauthorized access to their internal systems, particularly if the application has access to sensitive network resources or if the server hosting the application is not properly isolated from critical internal systems. The vulnerability can be exploited to access internal databases, network services, or other applications that may be accessible from the server hosting AssetExplorer. This makes the flaw particularly dangerous in enterprise environments where network segmentation is expected to protect sensitive systems from direct internet access. Security teams should consider this vulnerability as a potential entry point for attackers seeking to establish persistence within network environments.
Mitigation strategies for CVE-2019-12994 should focus on implementing proper input validation and sanitization mechanisms within the AJaxServlet component, ensuring that all user-supplied parameters are thoroughly validated before being used in any network operations. Organizations should immediately upgrade to a patched version of Zoho ManageEngine AssetExplorer, as the vendor has likely released security updates addressing this specific vulnerability. Network segmentation and firewall rules should be implemented to restrict access to the affected servlet and limit the potential impact of exploitation. Additionally, implementing web application firewalls and monitoring for suspicious network requests can help detect and prevent exploitation attempts. The remediation process should also include comprehensive security testing of all application components that handle external input, particularly those that perform network operations. Organizations should conduct thorough vulnerability assessments to identify similar patterns in other applications that might be susceptible to the same class of vulnerabilities, ensuring that the fix addresses not just the immediate issue but also prevents similar flaws from existing in other parts of the application infrastructure.