CVE-2022-39248

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Summary

CVECVE-2022-39248
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-09-28 20:15:00 UTC
Updated2022-09-30 16:24:00 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 that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. matrix-android-sdk2 would then additionally sign such a key backup with its device key, spilling trust over to other devices trusting the matrix-android-sdk2 device. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-android-sdk2 version 1.5.1 has been modified to only accept Olm-encrypted to-device messages and to stop signing backups on a successful decryption. Out of caution, several other checks have been audited or added. 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 | CWE-322

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Matrix Software Development Kit All All All All

References

ReferenceSourceLinkTags
Olm/Megolm protocol confusion · Advisory · matrix-org/matrix-android-sdk2 · GitHub CONFIRM github.com
Release v1.5.1 · matrix-org/matrix-android-sdk2 · GitHub MISC github.com
Upgrade now to address E2EE vulnerabilities in matrix-js-sdk, matrix-ios-sdk and matrix-android-sdk2 | Matrix.org MISC matrix.org
Merge branch 'release/1.5.1' into develop · matrix-org/matrix-android-sdk2@77df720 · GitHub MISC github.com
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