CVE-2022-39257 (GCVE-0-2022-39257)
Vulnerability from cvelistv5
Published
2022-09-28 20:55
Modified
2025-04-23 16:54
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| matrix-org | matrix-ios-sdk |
Version: < 0.23.19 |
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This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-322\", \"description\": \"CWE-322: Key Exchange without Entity Authentication\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-287\", \"description\": \"CWE-287: Improper Authentication\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2022-09-28T20:55:10.000Z\"}, \"x_legacyV4Record\": {\"impact\": {\"cvss\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, \"source\": {\"advisory\": \"GHSA-qxr3-5jmq-xcf4\", \"discovery\": \"UNKNOWN\"}, \"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"version\": {\"version_data\": [{\"version_value\": \"\u003c 0.23.19\"}]}, \"product_name\": \"matrix-ios-sdk\"}]}, \"vendor_name\": \"matrix-org\"}]}}, \"data_type\": \"CVE\", \"references\": {\"reference_data\": [{\"url\": \"https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients\", \"name\": \"https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients\", \"refsource\": \"MISC\"}, {\"url\": \"https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c\", \"name\": \"https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c\", \"refsource\": \"MISC\"}, {\"url\": \"https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19\", \"name\": \"https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19\", \"refsource\": \"MISC\"}, {\"url\": \"https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4\", \"name\": \"https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-qxr3-5jmq-xcf4\", \"refsource\": \"CONFIRM\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. 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This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"CWE-322: Key Exchange without Entity Authentication\"}]}, {\"description\": [{\"lang\": \"eng\", \"value\": \"CWE-287: Improper Authentication\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2022-39257\", \"STATE\": \"PUBLIC\", \"TITLE\": \"Matrix iOS SDK vulnerable to impersonation via forwarded Megolm sessions\", \"ASSIGNER\": \"security-advisories@github.com\"}}}}",
"cveMetadata": "{\"cveId\": \"CVE-2022-39257\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-04-23T16:54:28.718Z\", \"dateReserved\": \"2022-09-02T00:00:00.000Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2022-09-28T20:55:10.000Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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