CVE-2020-26257
Denial of service attack via incorrect parameters in Matrix Synapse
描述
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`).
如何修補 CVE-2020-26257
要修補 CVE-2020-26257,請將受影響套件升級到下列已修補版本。
- —升級至 1.24.0-1 或更新版本
- —升級至 1.23.1 或更新版本
- —升級至 3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b 或更新版本
CVE-2020-26257 正在被利用嗎?
低 — EPSS 為 2.4%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- from 0, < 1.24.0-1
- from 0, < 1.23.1
- from 0, < 3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b | from 0, < 1.23.1
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |