Matrix 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.
References
Link | Resource |
---|---|
https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c | Patch Third Party Advisory |
https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19 | Release Notes Third Party Advisory |
https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4 | Third Party Advisory |
https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients | Vendor Advisory |
Configurations
History
30 Sep 2022, 16:10
Type | Values Removed | Values Added |
---|---|---|
CPE | cpe:2.3:a:matrix:software_development_kit:*:*:*:*:*:iphone_os:*:* | |
First Time |
Matrix software Development Kit
Matrix |
|
CWE | CWE-287 | |
CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
References | (CONFIRM) https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4 - Third Party Advisory | |
References | (MISC) https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients - Vendor Advisory | |
References | (MISC) https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c - Patch, Third Party Advisory | |
References | (MISC) https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19 - Release Notes, Third Party Advisory |
28 Sep 2022, 21:15
Type | Values Removed | Values Added |
---|---|---|
New CVE |
Information
Published : 2022-09-28 21:15
Updated : 2023-12-10 14:35
NVD link : CVE-2022-39257
Mitre link : CVE-2022-39257
CVE.ORG link : CVE-2022-39257
JSON object : View
Products Affected
matrix
- software_development_kit