CVE-2022-39246

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Summary

CVECVE-2022-39246
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-09-28 20:15:00 UTC
Updated2022-09-30 17:12:00 UTC
Descriptionmatrix-android-sdk2 is the Matrix SDK for Android. Prior to version 1.5.1, an attacker cooperating with a malicious homeserver can construct messages appearing to have come from another person. Such messages will be marked with a grey shield on some platforms, but this may be missing in others. This attack is possible due to the key forwarding strategy implemented in the matrix-android-sdk2 that is too permissive. Starting with version 1.5.1, the default policy for accepting key forwards has been made more strict in the matrix-android-sdk2. The matrix-android-sdk2 will now only accept forwarded keys in response to previously issued requests and only from own, verified devices. The SDK now sets a `trusted` flag on the decrypted message upon decryption, based on whether the key used to decrypt the message was received from a trusted source. Clients need to ensure that messages decrypted with a key with `trusted = false` are decorated appropriately (for example, by showing a warning for such messages). As a workaroubnd, current users of the SDK can disable key forwarding in their forks using `CryptoService#enableKeyGossiping(enable: Boolean)`.

Risk And Classification

Problem Types: CWE-287 | CWE-322

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Matrix Software Development Kit All All All All

References

ReferenceSourceLinkTags
Release v1.5.1 · matrix-org/matrix-android-sdk2 · GitHub MISC github.com
MSC3061: Sharing room keys for past messages by uhoreg · Pull Request #3061 · matrix-org/matrix-spec-proposals · GitHub MISC github.com
Impersonation via forwarded Megolm sessions · Advisory · matrix-org/matrix-android-sdk2 · GitHub CONFIRM github.com
Merge branch 'release/1.5.1' into develop · matrix-org/matrix-android-sdk2@77df720 · GitHub MISC github.com
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