CVE-2023-30856 in eDEX-UI
Summary
by MITRE • 04/28/2023
eDEX-UI is a science fiction terminal emulator. Versions 2.2.8 and prior are vulnerable to cross-site websocket hijacking. When running eDEX-UI and browsing the web, a malicious website can connect to eDEX's internal terminal control websocket, and send arbitrary commands to the shell. The project has been archived since 2021, and as of time of publication there are no plans to patch this issue and release a new version. Some workarounds are available, including shutting down eDEX-UI when browsing the web and ensuring the eDEX terminal runs with lowest possible privileges.
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Analysis
by VulDB Data Team • 05/24/2023
The eDEX-UI terminal emulator presents a critical cross-site websocket hijacking vulnerability that fundamentally undermines the security boundaries of its internal communication mechanisms. This vulnerability stems from the application's failure to properly validate websocket connections originating from external domains, creating an attack surface where malicious web content can establish unauthorized connections to the internal terminal control websocket. The flaw exists in versions 2.2.8 and earlier, representing a classic implementation weakness in websocket security controls that allows unauthorized access to shell execution capabilities through seemingly benign web browsing activities.
The technical exploitation of this vulnerability occurs through a sophisticated attack vector that leverages the trust relationship between the eDEX-UI application and its internal websocket endpoints. When a user browses the web while eDEX-UI is running, a malicious website can establish a websocket connection to the internal terminal control interface without proper authentication or authorization checks. This connection enables the attacker to send arbitrary commands directly to the underlying shell, effectively providing remote code execution capabilities within the user's terminal environment. The vulnerability maps directly to CWE-352, Cross-Site Request Forgery, and CWE-614, Sensitive Cookie in HTTPS Session Without 'Secure' Attribute, as it represents an unauthorized access to internal system resources through a trusted communication channel.
The operational impact of this vulnerability extends beyond simple command execution to encompass complete system compromise within the context of the user's terminal environment. Attackers can leverage this weakness to execute arbitrary shell commands, potentially escalating privileges, accessing sensitive files, or establishing persistent access through backdoor creation. The archived status of the eDEX-UI project since 2021 compounds the severity by eliminating any possibility of official patches or updates, leaving affected users without proper remediation paths. This vulnerability represents a particularly dangerous scenario in environments where users may browse untrusted websites while maintaining active terminal sessions, creating an inherent risk that persists across all vulnerable versions.
Security mitigations for this vulnerability must rely on operational controls and environmental restrictions rather than technical patches, as the project's archived status prevents official remediation. Users should implement the suggested workarounds including shutting down eDEX-UI when browsing the web, which effectively eliminates the attack surface by ensuring no active websocket endpoints are available for exploitation. Additionally, running the eDEX terminal with the lowest possible privileges significantly reduces the potential impact of successful exploitation attempts. These mitigations align with the principle of least privilege and demonstrate the importance of defense in depth strategies when dealing with legacy applications that cannot be updated or patched. The vulnerability also highlights the need for comprehensive security testing of internal communication mechanisms and proper websocket security implementation, particularly in applications that expose internal control interfaces to potentially untrusted environments.
The attack patterns associated with this vulnerability correspond to ATT&CK technique T1059.007, Command and Scripting Interpreter: JavaScript, as attackers can leverage web-based JavaScript to establish websocket connections and execute commands. This represents a sophisticated attack chain that combines web-based exploitation with internal system compromise, making it particularly challenging to detect and prevent through traditional security controls. Organizations should consider implementing network segmentation and websocket traffic monitoring to detect unauthorized websocket connections to internal applications, while also ensuring that legacy applications with known vulnerabilities are properly isolated from untrusted network environments. The vulnerability underscores the critical importance of maintaining security awareness regarding archived projects and their continued operational risks in modern computing environments.