CVE-2021-34813
Matrix libolm Buffer Overflow Vulnerability
Description
Matrix libolm before 3.2.3 allows a malicious Matrix homeserver to crash a client (while it is attempting to retrieve an Olm encrypted room key backup from the homeserver) because olm_pk_decrypt has a stack-based buffer overflow. Remote code execution might be possible for some nonstandard build configurations.
INFO
Published Date :
June 16, 2021, 6:15 p.m.
Last Modified :
Nov. 21, 2024, 6:11 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update the affected libolm-dev, libolm3 and / or python3-olm packages.
Public PoC/Exploit Available at Github
CVE-2021-34813 has a 5 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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-2021-34813.
| URL | Resource |
|---|---|
| https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b | Patch Vendor Advisory |
| https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 | Release Notes Vendor Advisory |
| https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm | Exploit Patch Vendor Advisory |
| https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b | Patch Vendor Advisory |
| https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 | Release Notes Vendor Advisory |
| https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm | Exploit Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-34813 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-2021-34813
weaknesses.
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).
None
CMake Makefile Ruby Swift Java C++ C Python Nix Shell
None
CMake Makefile Ruby Swift Java C++ C Python Nix Shell
An implementation of the Double Ratchet cryptographic ratchet
CMake Makefile Ruby Swift Python Nix C++ C Shell Lua
None
CMake Makefile Ruby Swift Java C++ C Python Shell Lua
None
CMake Makefile Ruby Swift Java C++ C Python Nix Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-34813 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-34813 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 af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b Added Reference https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 Added Reference https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Jun. 23, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b No Types Assigned https://gitlab.matrix.org/matrix-org/olm/-/commit/ccc0d122ee1b4d5e5ca4ec1432086be17d5f901b Patch, Vendor Advisory Changed Reference Type https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 No Types Assigned https://gitlab.matrix.org/matrix-org/olm/-/releases/3.2.3 Release Notes, Vendor Advisory Changed Reference Type https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm No Types Assigned https://matrix.org/blog/2021/06/14/adventures-in-fuzzing-libolm Exploit, Patch, Vendor Advisory Added CWE NIST CWE-787 Added CPE Configuration OR *cpe:2.3:a:matrix:olm:*:*:*:*:*:*:*:* versions up to (excluding) 3.2.3
Vulnerability Scoring Details
Base CVSS Score: 9.8
Base CVSS Score: 7.5
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
4.46 }} -5.82%
score
0.88028
percentile