7.5
HIGH
CVE-2022-31152
Matrix Synapse Event Authorization Rule Bypass Vulnerability
Description

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including version 1.61.0, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`) as a workaround.

INFO

Published Date :

Sept. 2, 2022, 8:15 p.m.

Last Modified :

Sept. 9, 2022, 3:21 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2022-31152 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 synapse
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-2022-31152.

URL Resource
https://github.com/matrix-org/synapse/pull/13087 Issue Tracking Patch Third Party Advisory
https://github.com/matrix-org/synapse/pull/13088 Issue Tracking Patch Third Party Advisory
https://github.com/matrix-org/synapse/releases/tag/v1.62.0 Release Notes Third Party Advisory
https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765 Issue Tracking 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-2022-31152 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2022-31152 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]

    Sep. 09, 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:H
    Changed Reference Type https://github.com/matrix-org/synapse/pull/13087 No Types Assigned https://github.com/matrix-org/synapse/pull/13087 Issue Tracking, Patch, Third Party Advisory
    Changed Reference Type https://github.com/matrix-org/synapse/pull/13088 No Types Assigned https://github.com/matrix-org/synapse/pull/13088 Issue Tracking, Patch, Third Party Advisory
    Changed Reference Type https://github.com/matrix-org/synapse/releases/tag/v1.62.0 No Types Assigned https://github.com/matrix-org/synapse/releases/tag/v1.62.0 Release Notes, Third Party Advisory
    Changed Reference Type https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765 No Types Assigned https://github.com/matrix-org/synapse/security/advisories/GHSA-jhjh-776m-4765 Issue Tracking, Mitigation, Third Party Advisory
    Added CWE NIST CWE-755
    Added CPE Configuration OR *cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:* versions up to (excluding) 1.62.0
  • CVE Modified by [email protected]

    Sep. 02, 2022

    Action Type Old Value New Value
    Changed Description Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including version 1.61.0, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`) as a workaround. Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including version 1.61.0, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`) as a workaround.
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-2022-31152 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-2022-31152 weaknesses.

Exploit Prediction

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

0.13 }} 0.01%

score

0.47201

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
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