要点
- CVE-2020-26257 是影响 matrix-synapse, synapse (matrix) 的中危 (CVSS 6.5)漏洞。
- 未来 30 天内被利用的概率（EPSS）：2.4%，高于 84.0% 的漏洞。
- 修复：升级到 1.23.1 或更高版本。
Description
Impact
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.
Patches
Issue is resolved by https://github.com/matrix-org/synapse/pull/8776.
Workarounds
Homeserver administrators could limit access to the federation API to trusted servers (for example via federation_domain_whitelist).
NVD description
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`).
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