CVE-2021-32772 in Poddycast
Summary
by MITRE • 08/03/2021
Poddycast is a podcast app made with Electron. Prior to version 0.8.1, an attacker can create a podcast or episode with malicious characters and execute commands on the client machine. The application does not clean the HTML characters of the podcast information obtained from the Feed, which allows the injection of HTML and JS code (cross-site scripting). Being an application made in electron, cross-site scripting can be scaled to remote code execution, making it possible to execute commands on the machine where the application is running. The vulnerability is patched in Poddycast version 0.8.1.
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Analysis
by VulDB Data Team • 08/07/2021
CVE-2021-32772 represents a critical security vulnerability in the Poddycast podcast application built on the Electron framework. This vulnerability stems from inadequate input sanitization of podcast feed data, specifically failing to properly escape HTML characters in podcast metadata. The flaw exists in versions prior to 0.8.1 where the application processes podcast information directly from RSS feeds without sufficient sanitization measures. Attackers can exploit this by crafting malicious podcast entries containing HTML and JavaScript code within podcast titles, descriptions, or other metadata fields. The root cause aligns with CWE-79, Cross-Site Scripting, where the application fails to validate and sanitize user-supplied input before rendering it in the application interface. This vulnerability is particularly dangerous within the Electron context because the framework's architecture allows web-based code execution within the desktop application environment.
The operational impact of this vulnerability extends far beyond typical web-based XSS attacks due to the Electron application architecture. When malicious code is injected into podcast metadata and subsequently rendered within the Poddycast application, the JavaScript execution context can leverage Electron's Node.js integration capabilities. This creates a direct pathway for attackers to execute arbitrary commands on the victim's machine with the privileges of the user running the application. The vulnerability essentially transforms a web-based scripting flaw into a remote code execution threat, as the Electron framework provides access to system resources through its nodeIntegration feature. Attackers can potentially download and execute malware, access local files, modify system configurations, or establish persistent access through this vector.
This vulnerability demonstrates a classic example of how web application security flaws can be amplified in desktop environments built on web technologies. The attack surface expands significantly because the Electron framework combines web rendering capabilities with native system access, creating a hybrid execution environment where malicious web code can interact with the underlying operating system. The patch implemented in version 0.8.1 addresses this by introducing proper HTML sanitization and input validation mechanisms to prevent malicious code injection. Organizations should consider this vulnerability in the context of the ATT&CK framework under T1059 Command and Scripting Interpreter, specifically targeting the execution of malicious code through application interfaces. The vulnerability also relates to T1566 Initial Access through malicious content delivery, where podcast feeds serve as the attack vector.
The remediation approach for CVE-2021-32772 involves comprehensive input validation and output encoding practices. Applications built on Electron frameworks must implement robust sanitization libraries such as DOMPurify or similar HTML sanitizers to filter malicious content before rendering. The fix should include proper escaping of HTML characters, validation of all podcast feed data, and implementation of Content Security Policy headers within the Electron application. Additionally, developers should disable unnecessary Node.js integration features when rendering user-supplied content and implement strict sandboxing mechanisms. Organizations should also consider implementing network-level filtering to detect and block malicious podcast feeds, though the primary defense remains proper application-level sanitization. Regular security updates and vulnerability assessments are crucial for maintaining protection against similar flaws in Electron-based applications.