Horizon Alert
Summary of the vulnerability and why it matters
A path traversal vulnerability has been identified in the Legcord application, allowing malicious scripts to execute commands and manipulate files outside of designated directories. This issue arises from unvalidated theme IDs within the application's theme handling processes. The primary concern is to confirm if this specific application is in use within the organization and, if so, to understand the potential exposure.
- Unvalidated themes allow script execution and file manipulation.
- Confirms if this client-side application is relevant.
- Assess potential exposure and relevance to our environment.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this by first executing script within the Discord origin, potentially through a cross-site scripting (XSS) attack. This script can then abuse specific theme handling functions, such as installing or uninstalling themes, to bypass security restrictions. By manipulating theme identifiers, the attacker can target files and directories outside the intended themes folder, leading to the execution of local commands, deletion of files, or writing arbitrary data.
- Requires script execution within Discord origin.
- Triggers via unvalidated theme identifiers in IPC handlers.
- Leads to arbitrary code execution and file manipulation.
Live Threat
Current exploitation, exposure, and threat context
When supported by the advisory, attackers with script execution capabilities within the Discord origin could abuse theme handlers to write files outside the intended directory, recursively delete directories, or launch local executables.
- Local executables could be launched.
- Directories could be recursively deleted.
- Files could be written outside themes.
Operational Fix
Recommended remediation, mitigation, and detection steps
Understanding who should act requires identifying the owners of the Legcord application and its deployment. The first practical step is to locate all instances of Legcord, determine if they are business-critical or exposed to risk, and then assign an accountable owner to plan remediation, potentially coordinating with the vendor.
- Application owners are responsible.
- Verify Legcord installation and reachability.
- Plan vendor-coordinated remediation.
