CVE-2020-5562 in Garoon
Summary
by MITRE
Server-side request forgery (SSRF) vulnerability in Cybozu Garoon 4.6.0 to 4.6.3 allows a remote attacker with an administrative privilege to issue arbitrary HTTP requests to other web servers via V-CUBE Meeting function.
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Analysis
by VulDB Data Team • 06/03/2024
The vulnerability identified as CVE-2020-5562 represents a critical server-side request forgery flaw affecting Cybozu Garoon versions 4.6.0 through 4.6.3. This security weakness resides within the V-CUBE Meeting function of the application, creating a pathway for remote attackers to execute unauthorized HTTP requests to arbitrary web servers. The vulnerability specifically targets systems where administrative privileges have been compromised, as the attack requires elevated access levels to exploit effectively. The flaw enables attackers to bypass normal access controls and potentially access internal network resources that would otherwise be restricted from external access.
The technical implementation of this SSRF vulnerability stems from inadequate input validation and sanitization within the V-CUBE Meeting function's processing logic. When the application handles requests related to meeting configurations or external integrations, it fails to properly validate user-supplied input parameters that control the destination of HTTP requests. This allows malicious actors to manipulate request parameters to redirect traffic to internal or external systems. The vulnerability aligns with CWE-918, which specifically addresses server-side request forgery attacks where applications fail to properly validate or sanitize user input that influences HTTP requests. The flaw creates an attack surface where administrative users can be coerced into making requests that appear legitimate to the target system but actually originate from the vulnerable application.
The operational impact of this vulnerability extends beyond simple data exfiltration, as it provides attackers with potential access to internal network resources that may contain sensitive information or critical infrastructure components. An attacker with administrative privileges can leverage this vulnerability to probe internal systems, potentially discovering additional vulnerabilities within the network perimeter. The attack vector demonstrates characteristics consistent with ATT&CK technique T1071.004, which involves application layer protocol manipulation to bypass security controls and gain unauthorized access to resources. The vulnerability's exploitation capability increases significantly when combined with other attack techniques, as it allows for reconnaissance activities that can reveal network topology, internal service configurations, and potential secondary targets.
Mitigation strategies for CVE-2020-5562 should prioritize immediate patching of affected Cybozu Garoon versions to the latest available releases that contain fixes for the SSRF vulnerability. Organizations should implement network segmentation and firewall rules to restrict access to internal resources from the application servers hosting Garoon. Additional protective measures include implementing strict input validation for all parameters used in the V-CUBE Meeting function, deploying web application firewalls to monitor and filter suspicious HTTP requests, and conducting thorough security assessments of the application's external integration points. The remediation process should also include disabling unnecessary external communication capabilities within the application and implementing proper access controls to limit administrative privileges to only essential personnel. Regular security audits and vulnerability assessments should be conducted to identify similar weaknesses in other components of the application ecosystem.