CVE-2022-31052
Synapse Unbounded Recursion URL Preview Vulnerability (Stack Exhaustion)
Description
Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for. Remote users are not able to exploit this directly, because the URL preview endpoint is authenticated. Deployments with `url_preview_enabled: false` set in configuration are not affected. Deployments with `url_preview_enabled: true` set in configuration **are** affected. Deployments with no configuration value set for `url_preview_enabled` are not affected, because the default is `false`. Administrators of homeservers with URL previews enabled are advised to upgrade to v1.61.1 or higher. Users unable to upgrade should set `url_preview_enabled` to false.
INFO
Published Date :
June 28, 2022, 5:15 p.m.
Last Modified :
Nov. 7, 2023, 3:47 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.8
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-2022-31052.
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-2022-31052 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2022-31052 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.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF/ [No types assigned] Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD/ [No types assigned] Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD/ Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF/ -
Initial Analysis by [email protected]
Jul. 09, 2022
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://github.com/matrix-org/synapse/commit/fa1308061802ac7b7d20e954ba7372c5ac292333 No Types Assigned https://github.com/matrix-org/synapse/commit/fa1308061802ac7b7d20e954ba7372c5ac292333 Patch, Third Party Advisory Changed Reference Type https://github.com/matrix-org/synapse/security/advisories/GHSA-22p3-qrh9-cx32 No Types Assigned https://github.com/matrix-org/synapse/security/advisories/GHSA-22p3-qrh9-cx32 Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD/ Mailing List, Third Party Advisory Changed Reference Type https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url No Types Assigned https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3preview_url Vendor Advisory Added CPE Configuration OR *cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* versions up to (excluding) 1.61.1 Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 08, 2022
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/QGSDQ4YAITCUACAB7SXQZDJIU3IQ4CJD/ [No Types Assigned] Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/7EARKKJZ2W7WUITFDT4EG4NVATFYJQHF/ [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2022-31052 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-2022-31052
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.14 }} 0.01%
score
0.48883
percentile