CVE-2019-19810 in Call Recording
Summary
by MITRE • 10/28/2021
Zoom Call Recording 6.3.1 from ZOOM International is vulnerable to Java Deserialization attacks targeting the inbuilt RMI service. A remote unauthenticated attacker can exploit this vulnerability by sending crafted RMI requests to execute arbitrary code on the target host.
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Analysis
by VulDB Data Team • 11/01/2021
The vulnerability identified as CVE-2019-19810 represents a critical security flaw in Zoom Call Recording version 6.3.1, which was discovered through comprehensive security analysis of the software's remote method invocation service. This vulnerability stems from improper handling of serialized Java objects within the application's built-in RMI (Remote Method Invocation) service, creating an attack vector that allows malicious actors to execute arbitrary code on affected systems. The flaw specifically affects the deserialization process, where the application fails to properly validate or sanitize incoming serialized data before processing it, leading to potential remote code execution capabilities.
The technical implementation of this vulnerability aligns with common Java deserialization attack patterns that have been documented in various security frameworks and threat intelligence reports. The RMI service in Zoom Call Recording 6.3.1 accepts serialized Java objects through network connections without adequate input validation, enabling attackers to craft malicious payloads that, when deserialized, trigger unintended code execution. This type of vulnerability falls under the CWE-502 category of "Deserialization of Untrusted Data" and represents a well-known attack vector that has been exploited in numerous high-profile security incidents. The attack requires no authentication credentials, making it particularly dangerous as it can be exploited by any remote attacker with network access to the vulnerable service.
The operational impact of CVE-2019-19810 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and unauthorized access to sensitive data. Attackers can leverage this vulnerability to establish persistent backdoors, escalate privileges, or deploy additional malware payloads within the network environment. The vulnerability affects systems running Zoom Call Recording 6.3.1, which typically operates in enterprise environments where sensitive business communications and data are processed. Organizations utilizing this software may face significant security risks including data breaches, unauthorized surveillance, and potential compliance violations that could result in substantial financial and reputational damage. The attack surface is particularly concerning because it targets the RMI service, which often runs on standard network ports and may be accessible from external networks without proper firewall restrictions.
Mitigation strategies for CVE-2019-19810 should focus on immediate remediation through software updates, as Zoom released patches to address this specific vulnerability. Organizations should implement network segmentation to isolate the affected RMI service from external networks, disable unnecessary RMI services when possible, and apply strict firewall rules to restrict access to the service. Security teams should conduct comprehensive network monitoring to detect potential exploitation attempts and implement application whitelisting to prevent execution of unauthorized code. The vulnerability demonstrates the importance of proper input validation and secure coding practices, particularly when dealing with serialized data in network services. Organizations should also consider implementing intrusion detection systems that can identify anomalous RMI traffic patterns and establish incident response procedures for rapid containment of potential exploitation attempts. The ATT&CK framework categorizes this vulnerability under the technique of "Deserialization of Untrusted Data" with potential lateral movement and privilege escalation capabilities, emphasizing the need for comprehensive defensive measures beyond simple patching.