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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTM1ZzQtcXgzYy12amh4

Automatic room upgrade handling can be used maliciously to bridge a room non-consentually

Impact

If a bridge has room upgrade handling turned on in the configuration (the roomUpgradeOpts key when instantiating a new Bridge instance.), any m.room.tombstone event it encounters will be used to unbridge the current room and bridge into the target room. However, the target room m.room.create event is not checked to verify if the predecessor field contains the previous room. This means that any mailcious admin of a bridged room can repoint the traffic to a different room without the new room being aware.

Patches

Versions 2.6.1 and greater are patched.

Workarounds

Disabling the automatic room upgrade handling can be done by removing the roomUpgradeOpts key from the Bridge class options.

References

The issue is patched by https://github.com/matrix-org/matrix-appservice-bridge/pull/330

For more information]

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Permalink: https://github.com/advisories/GHSA-35g4-qx3c-vjhx
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTM1ZzQtcXgzYy12amh4
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: almost 3 years ago
Updated: over 1 year ago


CVSS Score: 6.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Identifiers: GHSA-35g4-qx3c-vjhx, CVE-2021-32659
References: Repository: https://github.com/matrix-org/matrix-appservice-bridge
Blast Radius: 17.5

Affected Packages

npm:matrix-appservice-bridge
Dependent packages: 9
Dependent repositories: 488
Downloads: 2,219 last month
Affected Version Ranges: < 2.6.1
Fixed in: 2.6.1
All affected versions: 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.3.6, 0.3.7, 1.0.0, 1.0.1, 1.1.1, 1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.3.2, 1.3.3, 1.3.4, 1.3.5, 1.3.6, 1.3.7, 1.4.0, 1.6.0, 1.6.1, 1.7.0, 1.8.0, 1.8.1, 1.9.0, 1.9.1, 1.9.2, 1.10.0, 1.10.1, 1.10.2, 1.10.3, 1.11.0, 1.11.1, 1.12.0, 1.12.1, 1.12.2, 1.13.0, 1.13.1, 1.13.2, 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.3.1, 2.4.0, 2.4.1, 2.5.0, 2.6.0
All unaffected versions: 2.6.1, 2.7.0, 3.0.0, 3.1.0, 3.1.1, 3.1.2, 3.2.0, 4.0.0, 4.0.1, 4.0.2, 5.0.0, 5.1.0, 6.0.0, 7.0.0, 8.0.0, 8.1.0, 8.1.1, 8.1.2, 9.0.0, 9.0.1, 10.0.0, 10.1.0