CVE-2022-39257

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Summary

CVECVE-2022-39257
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-09-28 21:15:00 UTC
Updated2022-09-30 16:10:00 UTC
DescriptionMatrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, 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 matrix-ios-sdk implementing a too permissive key forwarding strategy. The default policy for accepting key forwards has been made more strict in the matrix-ios-sdk version 0.23.19. matrix-ios-sdk 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). This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.

Risk And Classification

Problem Types: CWE-287

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Matrix Software Development Kit All All All All

References

ReferenceSourceLinkTags
Upgrade now to address E2EE vulnerabilities in matrix-js-sdk, matrix-ios-sdk and matrix-android-sdk2 | Matrix.org MISC matrix.org
Resolve multiple CVEs · matrix-org/matrix-ios-sdk@5ca86c3 · GitHub MISC github.com
Impersonation via forwarded Megolm sessions · Advisory · matrix-org/matrix-ios-sdk · GitHub CONFIRM github.com
Release v0.23.19 · matrix-org/matrix-ios-sdk · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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