CVE-2021-21392
Open redirect via transitional IPv6 addresses on dual-stack networks
描述
Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks. See referenced GitHub security advisory for details and workarounds.
如何修補 CVE-2021-21392
要修補 CVE-2021-21392,請將受影響套件升級到下列已修補版本。
- —升級至 1.28.0rc1 或更新版本
CVE-2021-21392 正在被利用嗎?
低 — EPSS 為 0.9%,目前沒有觀察到大規模利用活動。
受影響套件(1)
- from 0, < 1.28.0rc1
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:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N |