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User content sandbox can be confused into opening arbitrary documents

Low severity GitHub Reviewed Published Mar 1, 2021 in matrix-org/matrix-react-sdk • Updated Feb 1, 2023

Package

npm matrix-react-sdk (npm)

Affected versions

< 3.15.0

Patched versions

3.15.0

Description

Impact

The user content sandbox can be abused to trick users into opening unexpected documents after several user interactions. The content can be opened with a blob origin from the Matrix client, so it is possible for a malicious document to access user messages and secrets.

Patches

This has been fixed by matrix-org/matrix-react-sdk#5657, which is included in 3.15.0.

Workarounds

There are no known workarounds.

References

@jryans jryans published to matrix-org/matrix-react-sdk Mar 1, 2021
Reviewed Mar 2, 2021
Published by the National Vulnerability Database Mar 2, 2021
Published to the GitHub Advisory Database Mar 3, 2021
Last updated Feb 1, 2023

Severity

Low

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
Network
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

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:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N

EPSS score

0.089%
(39th percentile)

Weaknesses

CVE ID

CVE-2021-21320

GHSA ID

GHSA-52mq-6jcv-j79x

Source code

No known source code

Credits

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