GHSA-23CM-X6J7-6HQ3
Vulnerability from github – Published: 2021-09-14 20:24 – Updated: 2023-08-08 19:58
VLAI?
Summary
matrix-js-sdk can be tricked into disclosing E2EE room keys to a participating homeserver
Details
Impact
A logic error in the room key sharing functionality of matrix-js-sdk before 12.4.1 allows a malicious Matrix homeserver† participating in an encrypted room to steal room encryption keys from affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.
† Or anyone with access to the account of the original recipient of an encrypted message.
Known clients affected (via their use of vulnerable versions of matrix-js-sdk):
- Element Web (1.8.2 and earlier)
- Element Desktop (1.8.2 and earlier)
- SchildiChat Web (1.7.32-sc1 and earlier)
- SchildiChat Desktop (1.7.32-sc1 and earlier)
- Cinny (1.2.0 and earlier)
Patch
This was fixed in https://github.com/matrix-org/matrix-js-sdk/commit/894c24880da0e1cc81818f51c0db80e3c9fb2be9.
Workarounds
To prevent a homeserver from being able to steal the room keys, vulnerable clients can be taken offline or signed out. If signing out, care should be taken to either set up Secure Backup or export E2E room keys in order to preserve access to past messages.
Severity ?
5.9 (Medium)
{
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "matrix-js-sdk"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "12.4.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-40823"
],
"database_specific": {
"cwe_ids": [
"CWE-200",
"CWE-327"
],
"github_reviewed": true,
"github_reviewed_at": "2021-09-14T18:08:41Z",
"nvd_published_at": "2021-09-13T19:15:00Z",
"severity": "MODERATE"
},
"details": "### Impact\n\nA logic error in the room key sharing functionality of matrix-js-sdk before 12.4.1 allows a malicious Matrix homeserver\u2020 participating in an encrypted room to steal room encryption keys from affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.\n\n\u2020 Or anyone with access to the account of the original recipient of an encrypted message.\n\nKnown clients affected (via their use of vulnerable versions of matrix-js-sdk):\n\n- Element Web (1.8.2 and earlier)\n- Element Desktop (1.8.2 and earlier)\n- SchildiChat Web (1.7.32-sc1 and earlier)\n- SchildiChat Desktop (1.7.32-sc1 and earlier)\n- Cinny (1.2.0 and earlier)\n\n### Patch\n\nThis was fixed in https://github.com/matrix-org/matrix-js-sdk/commit/894c24880da0e1cc81818f51c0db80e3c9fb2be9.\n\n### Workarounds\nTo prevent a homeserver from being able to steal the room keys, vulnerable clients can be taken offline or signed out. If signing out, care should be taken to either set up Secure Backup or export E2E room keys in order to preserve access to past messages.",
"id": "GHSA-23cm-x6j7-6hq3",
"modified": "2023-08-08T19:58:08Z",
"published": "2021-09-14T20:24:18Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/matrix-org/matrix-js-sdk/security/advisories/GHSA-23cm-x6j7-6hq3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-40823"
},
{
"type": "WEB",
"url": "https://github.com/matrix-org/matrix-js-sdk/commit/894c24880da0e1cc81818f51c0db80e3c9fb2be9"
},
{
"type": "PACKAGE",
"url": "https://github.com/matrix-org/matrix-js-sdk"
},
{
"type": "WEB",
"url": "https://github.com/matrix-org/matrix-js-sdk/releases/tag/v12.4.1"
},
{
"type": "WEB",
"url": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "matrix-js-sdk can be tricked into disclosing E2EE room keys to a participating homeserver"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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