Legcord 1.1.0 through 1.3.0 contains a path traversal vulnerability in theme IPC handlers that allows script in the Discord page to escape the themes directory via unvalidated theme ids. Attackers running script in the Discord origin, such as through XSS, can abuse themes.folder, themes.uninstall, and themes.install to launch local executables, recursively delete directories, and write files outside the themes directory.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
legcord:legcord
References 5
https://github.com/Legcord/Legcord
disclosure@vulncheck.com
https://github.com/Legcord/Legcord/blob/v1.3.0/src/common/themes.ts#L269-L276
disclosure@vulncheck.com
https://github.com/Legcord/Legcord/blob/v1.3.0/src/discord/ipc.ts#L201-L206
disclosure@vulncheck.com
https://github.com/Legcord/Legcord/issues/1163
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/legcord-1.1.0-through-1.3.0-path-traversal…
disclosure@vulncheck.com