CVE-2022-39255
See a problem?- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-39255
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-39255.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-39255
- Aliases
-
- GHSA-hw6g-j8v6-9hcm
- Published
- 2022-09-28T21:15:13Z
- Modified
- 2024-09-03T04:27:12.930384Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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 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. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-ios-sdk version 0.23.19 has been modified to only accept Olm-encrypted to-device messages. 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. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched.
- References
-
- https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcm
- https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients
- https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c
- https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19
Affected packages
Git / github.com/matrix-org/matrix-ios-sdk
Affected ranges
- Type
- GIT
- Repo
- https://github.com/matrix-org/matrix-ios-sdk
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed