gsd-2021-40824
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the attacker to decrypt end-to-end encrypted messages sent by affected clients.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-40824",
"description": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the attacker to decrypt end-to-end encrypted messages sent by affected clients.",
"id": "GSD-2021-40824"
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-40824"
],
"details": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the attacker to decrypt end-to-end encrypted messages sent by affected clients.",
"id": "GSD-2021-40824",
"modified": "2023-12-13T01:23:25.219566Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
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"CVE_data_meta": {
"ASSIGNER": "cve@mitre.org",
"ID": "CVE-2021-40824",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "n/a",
"version": {
"version_data": [
{
"version_value": "n/a"
}
]
}
}
]
},
"vendor_name": "n/a"
}
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"data_version": "4.0",
"description": {
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"value": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the attacker to decrypt end-to-end encrypted messages sent by affected clients."
}
]
},
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},
"references": {
"reference_data": [
{
"name": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing",
"refsource": "MISC",
"url": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
},
{
"name": "https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2",
"refsource": "MISC",
"url": "https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2"
}
]
}
},
"gitlab.com": {
"advisories": [
{
"affected_range": "(,1.2.2)",
"affected_versions": "All versions before 1.2.2",
"cvss_v2": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-937"
],
"date": "2021-09-24",
"description": "A logic error in the room key sharing functionality of Element Android exists. This error allows the attacker to decrypt end-to-end encrypted messages sent by affected clients.",
"fixed_versions": [
"1.2.2"
],
"identifier": "CVE-2021-40824",
"identifiers": [
"CVE-2021-40824"
],
"not_impacted": "All versions starting from 1.2.2",
"package_slug": "maven/org.matrix.android/matrix-android-sdk2",
"pubdate": "2021-09-13",
"solution": "Upgrade to version 1.2.2 or above.",
"title": "Use of a Broken or Risky Cryptographic Algorithm",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-40824",
"https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
],
"uuid": "92f3a5f3-a9d9-4ff7-999a-2f6f87e57753"
}
]
},
"nvd.nist.gov": {
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"nodes": [
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"cpe_match": [
{
"cpe23Uri": "cpe:2.3:a:matrix:element:*:*:*:*:*:android:*:*",
"cpe_name": [],
"versionEndExcluding": "1.2.2",
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:a:matrix:matrix-android-sdk2:*:*:*:*:*:android:*:*",
"cpe_name": [],
"versionEndExcluding": "1.2.2",
"vulnerable": true
}
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"operator": "OR"
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},
"cve": {
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"ID": "CVE-2021-40824"
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"description": {
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"value": "A logic error in the room key sharing functionality of Element Android before 1.2.2 and matrix-android-sdk2 (aka Matrix SDK for Android) before 1.2.2 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the attacker to decrypt end-to-end encrypted messages sent by affected clients."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "en",
"value": "CWE-327"
}
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}
]
},
"references": {
"reference_data": [
{
"name": "https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2",
"refsource": "MISC",
"tags": [
"Patch",
"Third Party Advisory"
],
"url": "https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2"
},
{
"name": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing",
"refsource": "MISC",
"tags": [
"Vendor Advisory"
],
"url": "https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing"
}
]
}
},
"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "MEDIUM",
"userInteractionRequired": false
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.2,
"impactScore": 3.6
}
},
"lastModifiedDate": "2021-09-24T17:40Z",
"publishedDate": "2021-09-13T19:15Z"
}
}
}
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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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