CVE-2018-19286 in Mubu Note
Summary
by MITRE
The server in mubu note 2018-11-11 has XSS by configuring an account with a crafted name value (along with an arbitrary username value), and then creating and sharing a note.
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Analysis
by VulDB Data Team • 04/13/2020
The vulnerability identified as CVE-2018-19286 represents a cross-site scripting flaw within the mubu note application version released on 2018-11-11. This security weakness allows attackers to execute malicious scripts in the context of other users' browsers through a carefully crafted account configuration. The vulnerability specifically manifests when an attacker configures an account with a maliciously crafted name value combined with an arbitrary username value, subsequently creating and sharing a note that triggers the XSS payload.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the application's account creation and note sharing mechanisms. When the application processes the crafted name value, it fails to properly escape or filter special characters that could be interpreted as HTML or JavaScript code. This processing occurs during the account configuration phase where the name parameter is stored and later rendered in the user interface without proper sanitization. The vulnerability becomes exploitable when the maliciously crafted name value contains script tags or other executable code that gets rendered in contexts where user input is displayed without appropriate encoding.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with the capability to hijack user sessions, steal sensitive information, or manipulate the application's functionality. An attacker could craft a name value containing malicious JavaScript that would execute whenever another user views the note or interacts with the shared content. This could lead to session hijacking, credential theft, or the redirection of users to malicious websites. The vulnerability is particularly concerning because it leverages the legitimate sharing functionality of the application, making it more difficult for users to distinguish between benign and malicious content. The attack requires minimal privileges since it only necessitates account creation and note sharing capabilities, which are typically available to all registered users.
Security professionals should note that this vulnerability aligns with CWE-79, which describes cross-site scripting flaws where untrusted data is improperly incorporated into web pages without proper validation or encoding. The attack pattern follows common XSS exploitation techniques documented in the MITRE ATT&CK framework under the technique of Web Application Attack Surface. Organizations should implement comprehensive input validation mechanisms, output encoding, and Content Security Policy headers to prevent such vulnerabilities. The remediation approach should include thorough sanitization of all user-provided input, particularly in fields that are rendered in web interfaces, and the implementation of proper context-aware encoding to ensure that malicious code cannot be executed within the application's user interface. Regular security testing and code reviews focusing on input handling and output rendering should be conducted to identify similar vulnerabilities in the application's codebase.