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CVE-2020-26257— Denial of service attack via incorrect parameters to federation APIs

Quick assessment

Affected
matrix-org synapse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 存在资源管理错误漏洞，该漏洞源于恶意的或实现不理想的主机服务器可以通过在“发送加入”、“发送离开”、“邀请”或“交换第三方邀请”请求的路径中指定不同的房间id来将畸形的事件注入到房间中。这可能导致拒绝服务，在这种情况下，未来的事件将不能通过联合正确地发送到其他服务器。

CVSS 6.5 · Medium EPSS 2.39% · P84

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-26257

Vulnerability Information
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Vulnerability Title
Denial of service attack via incorrect parameters to federation APIs
Source: CVE Program / CVE List V5
Vulnerability 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`).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Synapse 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 存在资源管理错误漏洞，该漏洞源于恶意的或实现不理想的主机服务器可以通过在“发送加入”、“发送离开”、“邀请”或“交换第三方邀请”请求的路径中指定不同的房间id来将畸形的事件注入到房间中。这可能导致拒绝服务，在这种情况下，未来的事件将不能通过联合正确地发送到其他服务器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
matrix-org synapse < 1.23.1 -

II. Public POCs for CVE-2020-26257

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III. Intelligence Information for CVE-2020-26257

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Patches & Fixes for CVE-2020-26257 (2)

Vendor Advisories for CVE-2020-26257 (1)

Mailing List Discussions for CVE-2020-26257 (2)

Other References for CVE-2020-26257 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-400