CVE-2016-6581
HPACK Denial of Service vulnerability (HPACK Bomb)
7.5
HIGH
CVSS 3.1
EPSS 0.37%
描述
A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header table into the dynamic header table. The attacker can then send a header block that is simply repeated requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine.
如何修補 CVE-2016-6581
要修補 CVE-2016-6581,請將受影響套件升級到下列已修補版本。
- —升級至 2.3.0-1 或更新版本
- —升級至 2.3.0 或更新版本
- —升級至 2.3.0 或更新版本
CVE-2016-6581 正在被利用嗎?
低 — EPSS 為 0.4%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- from 0, < 2.3.0-1
- >= 1.0.0, < 2.3.0
- 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 |