CVE-2022-39257
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-39257
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-39257.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-39257
- Aliases
-
- GHSA-qxr3-5jmq-xcf4
- Published
- 2022-09-28T20:55:10Z
- Modified
- 2025-11-28T04:34:18.410735Z
- 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
- Matrix iOS SDK vulnerable to impersonation via forwarded Megolm sessions
- 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 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
trustedflag 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 withtrusted = falseare 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. - Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-287", "CWE-322" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39257.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39257.json
- https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c
- https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19
- https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4
- https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients
- https://nvd.nist.gov/vuln/detail/CVE-2022-39257
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