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File upload local preview can run embedded scripts after user interaction

Moderate severity GitHub Reviewed Published May 17, 2021 in matrix-org/matrix-react-sdk • Updated Jan 9, 2023

Package

npm matrix-react-sdk (npm)

Affected versions

< 3.21.0

Patched versions

3.21.0

Description

Impact

When uploading a file, the local file preview can lead to execution of scripts embedded in the uploaded file, but only after several user interactions to open the preview in a separate tab. This only impacts the local user while in the process of uploading. It cannot be exploited remotely or by other users.

Patches

This has been fixed by matrix-org/matrix-react-sdk#5981, which is included in 3.21.0.

Workarounds

There are no known workarounds.

References

@jryans jryans published to matrix-org/matrix-react-sdk May 17, 2021
Reviewed May 17, 2021
Published to the GitHub Advisory Database May 17, 2021
Last updated Jan 9, 2023

Severity

Moderate

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
Low
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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:L/UI:R/S:U/C:L/I:L/A:L

Weaknesses

CVE ID

No known CVE

GHSA ID

GHSA-8796-gc9j-63rv

Source code

Credits

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