CVE-2022-41952
Synapse URL Preview Connection Denial of Service
Description
Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for media stream URLs without properly limiting connection time. Connections will only be terminated after `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived connections towards the streaming media server (for instance, Icecast). This can cause excessive traffic and connections toward such servers if their stream URL is, for example, posted to a large room with many Synapse instances with URL preview enabled. Version 1.52.0 implements a timeout mechanism which will terminate URL preview connections after 30 seconds. Since generating URL previews for media streams is not supported and always fails, 1.53.0 additionally implements an allow list for content types for which Synapse will even attempt to generate a URL preview. Upgrade to 1.53.0 to fully resolve the issue. As a workaround, turn off URL preview functionality by setting `url_preview_enabled: false` in the Synapse configuration file.
INFO
Published Date :
Nov. 22, 2022, 4:15 p.m.
Last Modified :
July 6, 2023, 1:37 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
3.9
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-2022-41952.
| URL | Resource |
|---|---|
| https://github.com/matrix-org/synapse/pull/11784 | Patch Third Party Advisory |
| https://github.com/matrix-org/synapse/pull/11936 | Patch Third Party Advisory |
| https://github.com/matrix-org/synapse/releases/tag/v1.52.0 | Release Notes Third Party Advisory |
| https://github.com/matrix-org/synapse/releases/tag/v1.53.0 | Release Notes Third Party Advisory |
| https://github.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47h | Mitigation Third Party 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-2022-41952 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2022-41952 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 -
Reanalysis by [email protected]
Jul. 06, 2023
Action Type Old Value New Value Added CWE NIST CWE-772 -
Initial Analysis by [email protected]
Nov. 26, 2022
Action Type Old Value New Value Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Changed Reference Type https://github.com/matrix-org/synapse/pull/11784 No Types Assigned https://github.com/matrix-org/synapse/pull/11784 Patch, Third Party Advisory Changed Reference Type https://github.com/matrix-org/synapse/pull/11936 No Types Assigned https://github.com/matrix-org/synapse/pull/11936 Patch, Third Party Advisory Changed Reference Type https://github.com/matrix-org/synapse/releases/tag/v1.52.0 No Types Assigned https://github.com/matrix-org/synapse/releases/tag/v1.52.0 Release Notes, Third Party Advisory Changed Reference Type https://github.com/matrix-org/synapse/releases/tag/v1.53.0 No Types Assigned https://github.com/matrix-org/synapse/releases/tag/v1.53.0 Release Notes, Third Party Advisory Changed Reference Type https://github.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47h No Types Assigned https://github.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47h Mitigation, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* versions up to (excluding) 1.53.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-41952 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-2022-41952
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.19 }} -0.00%
score
0.56031
percentile