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Lack of validation on openExternal allows XSS

High
laurent22 published GHSA-pc5v-xp44-5mgv Nov 25, 2024

Package

joplin/blob/dev/packages/app-desktop/gui/WindowCommandsAndDialogs/commands/openItem.ts

Affected versions

<3.0.3

Patched versions

3.0.3

Description

Summary

Attackers are able to abuse the fact that openExternal is used without any filtering of URI schemes to obtain remote code execution in Windows environments.

Details

Attackers are able to abuse the fact that openExternal is used without any filtering of URI schemes to obtain remote code execution in Windows environments. I recommend implementing filtering of allowed URI schemes.

PoC

https://udp.re/joplin_rce.mp4

Impact

Joplin user can fall victim to 1-click remote code execution.

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
High
Privileges required
High
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H

CVE ID

CVE-2024-53268

Weaknesses

No CWEs

Credits