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Vulnerability Details : CVE-2020-26257

Matrix is an ecosystem for open federated Instant Messaging and VoIP. Synapse is a reference "homeserver" implementation of Matrix. A malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a `/send_join`, `/send_leave`, `/invite` or `/exchange_third_party_invite` request. This can lead to a denial of service in which future events will not be correctly sent to other servers over federation. This affects any server which accepts federation requests from untrusted servers. The Matrix Synapse reference implementation before version 1.23.1 the implementation is vulnerable to this injection attack. Issue is fixed in version 1.23.1. As a workaround homeserver administrators could limit access to the federation API to trusted servers (for example via `federation_domain_whitelist`).
Publish Date : 2020-12-09 Last Update Date : 2020-12-19
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- CVSS Scores & Vulnerability Types

CVSS Score
4.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication ???
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 400

- Products Affected By CVE-2020-26257

# Product Type Vendor Product Version Update Edition Language
1 Application Matrix Synapse * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Matrix Synapse 1

- References For CVE-2020-26257

https://github.com/matrix-org/synapse/security/advisories/GHSA-hxmp-pqch-c8mm CONFIRM
https://github.com/matrix-org/synapse/commit/3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b
https://github.com/matrix-org/synapse/blob/develop/CHANGES.md#synapse-1231-2020-12-09
https://github.com/matrix-org/synapse/pull/8776
https://lists.fedoraproject.org/archives/list/[email protected]/message/QR4MMYZKX5N5GYGH4H5LBUUC5TLAFHI7/
FEDORA FEDORA-2020-a2172c484d
https://lists.fedoraproject.org/archives/list/[email protected]/message/DBTIU3ZNBFWZ56V4X7JIAD33V5H2GOMC/
FEDORA FEDORA-2020-eeb66c2ece

- Metasploit Modules Related To CVE-2020-26257

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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