CVE-2017-12581 in Electron
Summary
by MITRE
GitHub Electron before 1.6.8 allows remote command execution because of a nodeIntegration bypass vulnerability. This also affects all applications that bundle Electron code equivalent to 1.6.8 or earlier. Bypassing the Same Origin Policy (SOP) is a precondition; however, recent Electron versions do not have strict SOP enforcement. Combining an SOP bypass with a privileged URL internally used by Electron, it was possible to execute native Node.js primitives in order to run OS commands on the user's host. Specifically, a chrome-devtools://devtools/bundled/inspector.html window could be used to eval a Node.js child_process.execFile API call.
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Analysis
by VulDB Data Team • 11/03/2019
The vulnerability identified as CVE-2017-12581 represents a critical remote code execution flaw in GitHub Electron framework versions prior to 1.6.8. This security issue stems from a nodeIntegration bypass mechanism that allows attackers to circumvent the intended security boundaries of Electron applications. The vulnerability specifically targets applications that bundle Electron code equivalent to version 1.6.8 or earlier, making it a widespread concern across numerous software products that rely on this framework for their desktop application development. The flaw operates by exploiting a combination of factors that together create a pathway for arbitrary code execution on the victim's system.
The technical exploitation of this vulnerability requires a specific sequence of conditions to be met, beginning with the bypassing of the Same Origin Policy which serves as a fundamental web security mechanism. In earlier Electron versions, the enforcement of Same Origin Policy was not as strict as in later iterations, creating a window of opportunity for attackers to manipulate the security context. The vulnerability leverages a privileged URL internally used by Electron itself, specifically the chrome-devtools://devtools/bundled/inspector.html endpoint, which provides access to development tools and debugging capabilities. This internal URL serves as the attack vector because it operates with elevated privileges within the Electron framework, allowing access to Node.js primitives that should normally be restricted to the application's own security context.
The exploitation process involves using the chrome-devtools:// URL to execute JavaScript code that can access the Node.js child_process.execFile API, which enables the execution of operating system commands directly on the user's host machine. This represents a severe privilege escalation vulnerability because it transforms a web-based attack surface into a mechanism capable of executing native system commands. The attack requires the victim to be tricked into visiting a malicious website or opening a specially crafted document that triggers the vulnerability. Once executed, the malicious code can leverage the Node.js environment to perform actions such as file system access, network communication, and arbitrary command execution on the compromised system.
This vulnerability aligns with CWE-74 and CWE-94 categories, representing code injection and arbitrary code execution flaws respectively. The attack pattern follows techniques described in the MITRE ATT&CK framework under T1059 for command and script execution, and T1068 for exploit for privilege escalation. The security implications extend beyond individual applications to encompass entire ecosystems of software that depend on Electron for their desktop functionality. Organizations using Electron-based applications should immediately upgrade to versions 1.6.8 or later to mitigate this risk, as the vulnerability affects not only the core Electron framework but also any application that bundles Electron code with vulnerable versions. The flaw demonstrates the importance of proper privilege separation and the dangers of internal privileged URLs being accessible through external attack surfaces, highlighting the need for comprehensive security testing of framework components and their interactions with web-based attack vectors.