CVE-2016-9498 in Applications Manager
Summary
by MITRE
ManageEngine Applications Manager 12 and 13, allows unserialization of unsafe Java objects. The vulnerability can be exploited by remote user without authentication and it allows to execute remote code compromising the application as well as the operating system. As Application Manager's RMI registry is running with privileges of system administrator, by exploiting this vulnerability an attacker gains highest privileges on the underlying operating system.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 03/25/2020
The vulnerability identified as CVE-2016-9498 represents a critical security flaw in ManageEngine Applications Manager versions 12 and 13 that stems from improper handling of serialized Java objects within the application's remote method invocation (RMI) framework. This weakness falls under the category of insecure deserialization, a well-documented vulnerability pattern that has been classified under CWE-502 by the CWE database. The flaw exists in the application's RMI registry component which processes serialized objects without adequate validation or sanitization, creating an attack surface that allows malicious actors to inject arbitrary code into the target system. The vulnerability is particularly dangerous because it can be exploited remotely without requiring any authentication credentials, making it accessible to any attacker who can reach the application's network interface. This remote exploitation capability significantly broadens the potential attack vector and increases the severity of the vulnerability.
The technical implementation of this vulnerability allows attackers to craft specially crafted serialized Java objects that, when processed by the vulnerable RMI registry, trigger unintended code execution within the application's runtime environment. The RMI registry in ManageEngine Applications Manager operates with elevated privileges, specifically running under the context of a system administrator account. This privilege escalation aspect of the vulnerability means that successful exploitation does not merely compromise the application itself but provides attackers with complete control over the underlying operating system. The deserialization process fails to validate the type of objects being reconstructed, allowing attackers to inject malicious payload objects that execute arbitrary commands when the application attempts to deserialize them. This particular flaw demonstrates how insecure deserialization can serve as a gateway to full system compromise, especially when the vulnerable application operates with high-privilege accounts.
The operational impact of this vulnerability extends far beyond simple application compromise, as it creates a persistent threat vector that can be leveraged for extensive system infiltration and data exfiltration. Attackers who successfully exploit this vulnerability can gain complete administrative control over the target system, enabling them to install additional malware, modify system configurations, steal sensitive data, or establish persistent backdoors. The fact that the RMI registry runs with system administrator privileges means that the compromise affects not just the application but the entire operating environment, potentially exposing all system resources and data stored on the compromised machine. This vulnerability also demonstrates the critical importance of validating serialized object inputs in enterprise applications, particularly those that handle remote communication and inter-process communication. The exploitation of this flaw aligns with tactics described in the MITRE ATT&CK framework under the T1059.007 technique for command and scripting interpreter, specifically targeting remote code execution through Java deserialization vulnerabilities. Organizations running affected versions of ManageEngine Applications Manager face significant risk of complete system compromise, making this vulnerability a high-priority target for immediate remediation efforts.
The recommended mitigation strategies for CVE-2016-9498 focus on immediate patching of the affected software versions, as ManageEngine has released updates to address this specific vulnerability. Organizations should also implement network segmentation to limit access to the RMI registry ports and consider disabling RMI functionality if it is not essential for operations. Additional protective measures include monitoring for suspicious deserialization activities and implementing application whitelisting policies to restrict execution of unauthorized code. The vulnerability highlights the necessity of following secure coding practices for serialization and deserialization operations, particularly in enterprise applications that handle remote communication. Security teams should also conduct thorough vulnerability assessments of other applications running with elevated privileges to identify similar weaknesses in the organization's attack surface. The incident underscores the importance of maintaining current security patches and implementing robust security monitoring to detect exploitation attempts before they result in successful compromises.