| Vulnerability Name: | CVE-2020-26257 (CCN-193782) | ||||||||||||
| Assigned: | 2020-12-09 | ||||||||||||
| Published: | 2020-12-09 | ||||||||||||
| Updated: | 2022-10-12 | ||||||||||||
| Summary: | 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`). | ||||||||||||
| CVSS v3 Severity: | 6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) 5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
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| CVSS v2 Severity: | 4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
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| Vulnerability Type: | CWE-400 | ||||||||||||
| Vulnerability Consequences: | Denial of Service | ||||||||||||
| References: | Source: MITRE Type: CNA CVE-2020-26257 Source: XF Type: UNKNOWN matrix-cve202026257-dos(193782) Source: MISC Type: Release Notes, Third Party Advisory https://github.com/matrix-org/synapse/blob/develop/CHANGES.md#synapse-1231-2020-12-09 Source: MISC Type: Patch, Third Party Advisory https://github.com/matrix-org/synapse/commit/3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b Source: MISC Type: Patch, Third Party Advisory https://github.com/matrix-org/synapse/pull/8776 Source: CCN Type: synapse GIT Repository Denial of service attack via incorrect parameters to federation APIs Source: CONFIRM Type: Third Party Advisory https://github.com/matrix-org/synapse/security/advisories/GHSA-hxmp-pqch-c8mm Source: FEDORA Type: Mailing List, Third Party Advisory FEDORA-2020-eeb66c2ece Source: FEDORA Type: Mailing List, Third Party Advisory FEDORA-2020-a2172c484d | ||||||||||||
| Vulnerable Configuration: | Configuration 1: Configuration 2: Configuration CCN 1:  Denotes that component is vulnerable | ||||||||||||
| Oval Definitions | |||||||||||||
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