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matrix-synapse vulnerable to improper validation of receipts allows forged read receipts

Low severity GitHub Reviewed Published Sep 26, 2023 in matrix-org/synapse • Updated Jan 8, 2024

Package

pip matrix-synapse (pip)

Affected versions

>= 0.34.0, < 1.93.0

Patched versions

1.93.0

Description

Impact

Users were able to forge read receipts for any event (if they knew the room ID and event ID). Note that the users were not able to view the events, but simply mark it as read. This could be confusing as clients will show the event as read by the user, even if they are not in the room.

Patches

matrix-org/synapse#16327

Workarounds

There is no workaround.

References

@erikjohnston erikjohnston published to matrix-org/synapse Sep 26, 2023
Published to the GitHub Advisory Database Sep 26, 2023
Reviewed Sep 26, 2023
Published by the National Vulnerability Database Sep 27, 2023
Last updated Jan 8, 2024

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
None
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:N/S:U/C:N/I:L/A:N

EPSS score

0.067%
(30th percentile)

Weaknesses

CVE ID

CVE-2023-42453

GHSA ID

GHSA-7565-cq32-vx2x

Source code

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