8.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
0.001 Low
EPSS
Percentile
37.8%
When matrix-rust-sdk before 0.6 requests a room key from our devices, it correctly accepts key forwards only if they are a response to a previous request. However, it doesn’t check that the device that responded matches the device the key was requested from.
This allows a malicious homeserver to insert room keys of questionable validity into the key store in some situations, potentially assisting in an impersonation attack. Note that even if key injection succeeds in this way, all forwarded keys have the imported
flag set, which is used as an indicator that such keys have lesser authentication properties (and should be marked as such in clients, e.g. with a grey shield besides the message).
If you have any questions or comments about this advisory, e-mail us at [email protected].
CPE | Name | Operator | Version |
---|---|---|---|
matrix-sdk-crypto | lt | 0.6.0 |
github.com/advisories/GHSA-vp68-2wrm-69qm
github.com/matrix-org/matrix-rust-sdk/commit/093fb5d0aa21c0b5eaea6ec96b477f1075271cbb
github.com/matrix-org/matrix-rust-sdk/commit/41449d2cc360e347f5d4e1c154ec1e3185f11acd
github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.6.0
github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-vp68-2wrm-69qm
nvd.nist.gov/vuln/detail/CVE-2022-39252
rustsec.org/advisories/RUSTSEC-2022-0085.html