CVE-2017-15892 in Chat
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Slash Command Creator in Synology Chat before 2.0.0-1124 allow remote authenticated users to inject arbitrary web script or HTML via (1) COMMAND, (2) COMMANDS INSTRUCTION, or (3) DESCRIPTION parameter.
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Analysis
by VulDB Data Team • 01/19/2023
The vulnerability identified as CVE-2017-15892 represents a critical cross-site scripting flaw within the Slash Command Creator functionality of Synology Chat versions prior to 2.0.0-1124. This issue affects the web-based chat application's command creation interface where users can define custom slash commands for automated responses and integrations. The vulnerability stems from insufficient input validation and sanitization mechanisms that fail to properly escape or filter user-supplied data before rendering it within the application's web interface.
The technical exploitation of this vulnerability occurs through three specific parameter injection points within the command creation process: COMMAND, COMMANDS INSTRUCTION, and DESCRIPTION fields. Attackers with authenticated access to the Synology Chat system can leverage these parameters to inject malicious JavaScript code or HTML content that will execute in the context of other users who view the crafted commands. This authentication requirement does not mitigate the risk significantly since compromised user accounts or insider threats can easily exploit these vectors. The vulnerability maps directly to CWE-79, which categorizes cross-site scripting flaws as weaknesses in input validation and output encoding.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform session hijacking, steal sensitive user data, and potentially escalate privileges within the chat environment. When legitimate users view maliciously crafted slash commands, their browsers execute the injected scripts, which can capture cookies, redirect users to malicious sites, or even modify the chat interface to display fraudulent content. The attack surface is particularly concerning in enterprise environments where Synology Chat serves as a communication platform for sensitive business discussions and collaborative workspaces. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, specifically targeting the execution of malicious scripts through web-based interfaces.
Organizations utilizing Synology Chat should prioritize immediate patching to version 2.0.0-1124 or later, which implements proper input sanitization and output encoding mechanisms for all command creation parameters. Additionally, administrators should implement network-level monitoring to detect unusual command creation patterns and consider restricting user privileges to slash command creation where possible. The vulnerability demonstrates the critical importance of input validation in web applications and the potential for authenticated users to cause significant damage through XSS attacks. Security teams should conduct thorough reviews of all web-based application interfaces to identify similar input validation gaps that could be exploited by attackers with legitimate access credentials.