9.8
CRITICAL
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 :

June 23, 2021, 2:29 p.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2021-34813 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-34813 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Matrix olm
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

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

Updated: 3 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : Aug. 13, 2024, 3:12 a.m. This repo has been linked 2 different CVEs too.

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 [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
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
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.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

2.09 }} 0.60%

score

0.89322

percentile

CVSS31 - Vulnerability Scoring System
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