CVE-2021-29430
Sydent vulnerable to denial of service attack via memory exhaustion
描述
Sydent is a reference Matrix identity server. Sydent does not limit the size of requests it receives from HTTP clients. A malicious user could send an HTTP request with a very large body, leading to memory exhaustion and denial of service. Sydent also does not limit response size for requests it makes to remote Matrix homeservers. A malicious homeserver could return a very large response, again leading to memory exhaustion and denial of service. This affects any server which accepts registration requests from untrusted clients. This issue has been patched by releases 89071a1, 0523511, f56eee3. As a workaround request sizes can be limited in an HTTP reverse-proxy. There are no known workarounds for the problem with overlarge responses.
如何修補 CVE-2021-29430
要修補 CVE-2021-29430,請將受影響套件升級到下列已修補版本。
- —升級至 2.3.0 或更新版本
- —升級至 0523511d2fb40f2738f8a8549868f44b96e5dab7 或更新版本
CVE-2021-29430 正在被利用嗎?
低 — EPSS 為 1.8%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- from 0, < 2.3.0
- from 0, < 0523511d2fb40f2738f8a8549868f44b96e5dab7, < 89071a1a754c69a50deac89e6bb74002d4cda19d, < f56eee315b6c44fdd9f6aa785cc2ec744a594428 | from 0, < 2.3.0
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:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |