CVE-2021-40824
Element Android/Matrix SDK for Android Key Stealing Vulnerability
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.
INFO
Published Date :
Sept. 13, 2021, 7:15 p.m.
Last Modified :
Aug. 8, 2023, 2:22 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.2
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-40824.
| URL | Resource |
|---|---|
| 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-40824 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-40824 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CWE Remap by [email protected]
Aug. 08, 2023
Action Type Old Value New Value Changed CWE CWE-327 CWE-290 -
Initial Analysis by [email protected]
Sep. 24, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Changed Reference Type https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2 No Types Assigned https://github.com/matrix-org/matrix-android-sdk2/releases/tag/v1.2.2 Patch, Third Party Advisory Changed Reference Type https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing No Types Assigned https://matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing Vendor Advisory Added CWE NIST CWE-327 Added CPE Configuration OR *cpe:2.3:a:matrix:element:*:*:*:*:*:android:*:* versions up to (excluding) 1.2.2 *cpe:2.3:a:matrix:matrix-android-sdk2:*:*:*:*:*:android:*:* versions up to (excluding) 1.2.2 -
CVE Modified by [email protected]
Sep. 14, 2021
Action Type Old Value New Value Changed 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 leads to a situation where identity verification is inadequate and thus a key-requesting device can be impersonated. 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.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-40824 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-40824
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.08 }} 0.01%
score
0.35735
percentile