Nginx: Excessive CPU usage in HTTP/2 with small window updates (CVE-2019-9511)
Description
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
Solution(s)
- nginx-nginx-upgrade-1_16_1
- nginx-nginx-upgrade-1_17_3
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