CVE-2017-1000036 in Chat
Summary
by MITRE
All versions of Candy Chat are vulnerable to an XSS attack by message senders, permitting remote code execution within the page
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Analysis
by VulDB Data Team • 01/01/2021
The vulnerability identified as CVE-2017-1000036 affects all versions of Candy Chat, a web-based instant messaging application that facilitates real-time communication between users. This security flaw represents a critical cross-site scripting vulnerability that enables malicious actors to inject malicious code into chat messages, potentially compromising the entire communication platform. The vulnerability stems from inadequate input validation and output encoding mechanisms within the application's message handling system, creating an exploitable entry point for attackers to manipulate the application's behavior through crafted payloads.
The technical implementation of this vulnerability involves the failure to properly sanitize user input within chat messages, allowing attackers to embed malicious javascript code or other script-based payloads. When legitimate users view these crafted messages, the browser executes the embedded code within the context of the vulnerable application, effectively granting attackers the ability to perform actions on behalf of authenticated users. This type of vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically representing a stored XSS variant where malicious content is permanently stored on the server and executed when other users access the affected pages. The vulnerability's severity is amplified by the fact that it occurs during message transmission and display, making it particularly dangerous in environments where users trust the messaging platform.
The operational impact of CVE-2017-1000036 extends beyond simple data theft or session hijacking, as the vulnerability enables full remote code execution capabilities within the browser context of affected users. Attackers can leverage this vulnerability to steal session cookies, redirect users to malicious websites, modify chat content, or even execute arbitrary commands on the victim's machine through browser-based exploits. The attack surface is particularly broad given that Candy Chat applications are typically used in collaborative environments, educational institutions, or corporate settings where multiple users interact regularly. This makes the vulnerability especially dangerous as a single compromised message can affect numerous users simultaneously, potentially leading to widespread data breaches or system compromises.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input sanitization and output encoding measures throughout the application's message processing pipeline. Organizations should implement strict content security policies that prevent execution of inline scripts and restrict the types of content that can be embedded within chat messages. The solution involves deploying proper HTML escaping mechanisms for all user-generated content before rendering it in the browser, as well as implementing web application firewalls that can detect and block suspicious payload patterns. Additionally, regular security assessments should be conducted to identify similar vulnerabilities in other components of the messaging infrastructure. This vulnerability demonstrates the critical importance of implementing defense-in-depth strategies and adheres to ATT&CK technique T1211 which involves manipulating processes to execute malicious code, making it a prime target for attackers seeking persistent access within network environments.