CVE-2019-6503 in Cosin
Summary
by MITRE
There is a deserialization vulnerability in Chatopera cosin v3.10.0. An attacker can execute commands during server-side deserialization by uploading maliciously constructed files. This is related to the TemplateController.java impsave method and the MainUtils toObject method.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 07/02/2023
The vulnerability identified as CVE-2019-6503 represents a critical server-side deserialization flaw in Chatopera cosin version 3.10.0 that exposes the application to remote command execution attacks. This weakness stems from improper handling of serialized data within the application's deserialization process, creating a pathway for malicious actors to inject and execute arbitrary code on the affected server. The vulnerability specifically manifests in the TemplateController.java file within the impsave method and extends to the MainUtils toObject method, which serves as a critical entry point for processing potentially malicious serialized objects.
The technical exploitation of this vulnerability leverages the Java deserialization mechanism's inherent security risks, where the application fails to properly validate or sanitize serialized input before processing it. When an attacker uploads a maliciously constructed file containing serialized data, the application's deserialization process inadvertently executes the embedded malicious code during the object reconstruction phase. This type of vulnerability falls under CWE-502, which specifically addresses deserialization of untrusted data, making it a well-documented and dangerous class of security flaws that have been exploited in numerous high-profile attacks. The attack vector is particularly concerning because it allows remote code execution without requiring authentication, making it a prime target for automated exploitation tools.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data breaches. Successful exploitation enables attackers to gain full control over the affected server, allowing them to install backdoors, exfiltrate sensitive data, or use the compromised system as a launchpad for further attacks within the network infrastructure. The vulnerability affects the application's template import functionality, which is likely used for legitimate business purposes, making the attack surface more accessible through normal application usage patterns. This creates a dangerous scenario where routine administrative tasks could inadvertently trigger the exploitation process, potentially leading to prolonged undetected compromise periods.
Security mitigations for CVE-2019-6503 should focus on immediate remediation through patching the affected Chatopera cosin version to a secure release that properly validates serialized input. Organizations should implement strict input validation and sanitization measures, particularly around the TemplateController impsave method and MainUtils toObject functionality, to prevent deserialization of untrusted data. Network segmentation and monitoring should be enhanced to detect unusual deserialization activities, while implementing application whitelisting policies that restrict which serialized objects can be processed. Additionally, the principle of least privilege should be enforced to limit the damage potential even if exploitation occurs, and regular security assessments should be conducted to identify similar vulnerabilities in other application components. The ATT&CK framework categorizes this vulnerability under T1059.007 for command and scripting interpreter, highlighting the need for comprehensive endpoint detection and response capabilities to identify and prevent such exploitation attempts.