Horizon Alert
Summary of the vulnerability and why it matters
A configuration injection vulnerability exists in Legcord versions 1.1.0 through 1.3.0, allowing malicious scripts to modify client settings. This could enable attackers to redirect all client traffic through an interception proxy by exploiting a Discord Cross-Site Scripting (XSS) vulnerability. Given Legcord is a client-side application and not internet-exposed, the primary concern is confirming its relevance and any potential local exposure.
- Malicious scripts can change client settings.
- This could route all traffic through a proxy.
- Confirm relevance and exposure for this tool.
Attack Path
How an attacker could exploit the issue
An attacker could first compromise a user's Discord client through cross-site scripting (XSS) to inject malicious script. This script would then target a configuration setting within the Legcord application, allowing the attacker to modify critical application switches. By manipulating these settings, an attacker could reroute all client traffic through a proxy they control, potentially leading to data interception and manipulation.
- Requires an existing Discord XSS vulnerability.
- Script in Discord page writes any config key.
- Enables traffic interception and manipulation.
Live Threat
Current exploitation, exposure, and threat context
A configuration injection vulnerability could allow scripts within the Discord page to write arbitrary configuration keys, potentially enabling an attacker to inject malicious switches into the Legcord client. This could reroute all client network traffic through an interception proxy when supported by the advisory.
- Client traffic could be rerouted.
- Via Discord XSS and Legcord settings.
- All client traffic may be intercepted.
Operational Fix
Recommended remediation, mitigation, and detection steps
Given that Legcord is a client-side application, the primary responsibility likely falls to individual users or endpoint security teams to manage installations and configurations. The first practical step is to identify all endpoints where Legcord is deployed, assess the risk based on user privileges and network exposure, and then coordinate with users for remediation or mitigation actions.
- Identify affected users and endpoints.
- Verify user impact and configuration.
- Plan user-level remediation or mitigation.
