CVE-2021-40824
CVSS V2 Medium 4.3
CVSS V3 Medium 5.9
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.
Overview
- CVE ID
- CVE-2021-40824
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2021-09-13T19:15:19
- Last Modified Date
- 2021-09-24T17:40:07
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| cpe:2.3:a:matrix:element:*:*:*:*:*:android:*:* | 1 | OR | 1.2.2 | |
| cpe:2.3:a:matrix:matrix-android-sdk2:*:*:*:*:*:android:*:* | 1 | OR | 1.2.2 |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:M/Au:N/C:P/I:N/A:N
- Access Vector
- NETWORK
- Access Compatibility
- MEDIUM
- Authentication
- NONE
- Confidentiality Impact
- PARTIAL
- Integrity Impact
- NONE
- Availability Impact
- NONE
- Base Score
- 4.3
- Severity
- MEDIUM
- Exploitability Score
- 8.6
- Impact Score
- 2.9
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Attack Vector
- NETWORK
- Attack Compatibility
- HIGH
- Privileges Required
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- NONE
- Base Score
- 5.9
- Base Severity
- MEDIUM
- Exploitability Score
- 2.2
- Impact Score
- 3.6
References
| Reference URL | Reference Tags |
|---|---|
| https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2 | Patch Third Party Advisory |
| https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing | Vendor Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2021-40824 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40824 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 06:53:33 | Added to TrackCVE | |||
| 2022-12-05 10:27:24 | 2021-09-13T19:15Z | 2021-09-13T19:15:19 | CVE Published Date | updated |
| 2022-12-05 10:27:24 | 2021-09-24T17:40:07 | CVE Modified Date | updated | |
| 2022-12-05 10:27:24 | Analyzed | Vulnerability Status | updated |