In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the `PreferenceUtils.merge` function in `@theia/core` recursively merges preference values without rejecting prototype-related keys (`__proto__`, `constructor`, `prototype`). Because this function is invoked by `PreferenceServiceImpl.doResolve` for every preference resolution across scopes (default, user, workspace, folder), a crafted preference value in a workspace settings file (`.theia/settings.json` or `.vscode/settings.json`) can pollute `Object.prototype` when the user opens the workspace, potentially altering application logic across the Theia process.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
Active
User action required
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
High
Complete data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Eclipse Theia
cpe:2.3:a:eclipse:theia:*:*:*:*:*:*:*:*
|
0.7.0
|
1.74.0
|
References 4
https://github.com/eclipse-theia/theia/security/advisories/GHSA-f3w9-qfw3-xr32
emo@eclipse.org
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/157
emo@eclipse.org
https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/567
emo@eclipse.org
https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/567
134c704f-9b21-4f2e-91b3-4a467353bcc0