Outline is a service that allows for collaborative documentation. In versions 0.72.0 through 0.83.0, Outline introduced a feature which facilitates local file system storage capabilities as an optional file storage strategy. This feature allowed a CSP bypass as well as a ContentType bypass that might facilitate further attacks.
In the case of self-hosting and using Outline FILE_STORAGE=local on the same domain as the Outline application, a malicious payload can be uploaded as a file attachment and bypass those CSP restrictions, allowing script execution within the context of another user. This is fixed in version 0.84.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Getoutline Outline
cpe:2.3:a:getoutline:outline:*:*:*:*:*:*:*:*
|
0.72.0
|
0.84.0
|
References 3
https://github.com/outline/outline/commit/18bc93c9c207329244c6909606a2393e86389…
security-advisories@github.com
https://github.com/outline/outline/releases/tag/v0.84.0
security-advisories@github.com
https://github.com/outline/outline/security/advisories/GHSA-gcj7-c9jv-fhgf
security-advisories@github.com