CVE-2022-39252

When matrix-rust-sdk recieves forwarded room keys, the reciever doesn't check if it requested the key from the forwarder

Published Sep 29, 2022 CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Description
matrix-rust-sdk is an implementation of a Matrix client-server library in Rust, and matrix-sdk-crypto is the Matrix encryption library. Prior to version 0.6, when a user requests a room key from their devices, the software correctly remembers the request. When the user receives a forwarded room key, the software accepts it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.6 fixes this issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2022-6950 matrix-rust-sdk is an implementation of a Matrix client-server library in Rust, and matrix-sdk-crypto is the Matrix encryption library. Prior to version 0.6, when a user requests a room key from their devices, the software correctly remembers the request. When the user receives a forwarded room key, the software accepts it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.6 fixes this issue.
Github GHSA Github GHSA GHSA-vp68-2wrm-69qm matrix-sdk-crypto contains potential impersonation via room key forward responses
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Apr 23, 2025, 4:54 PM
Reserved
Sep 2, 2022, 12:00 AM
Status
Modified
Published
Sep 29, 2022, 3:15 PM
Modified
Jun 17, 2026, 4:58 AM