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Nginx: Excessive CPU usage in HTTP/2 with small window updates (CVE-2019-9511)

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Nginx: Excessive CPU usage in HTTP/2 with small window updates (CVE-2019-9511)

Severity
8
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Published
08/14/2019
Created
08/15/2019
Added
08/14/2019
Modified
11/27/2024

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

References

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