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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
10/15/2023

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

  • https://attackerkb.com/topics/cve-2019-9511
  • 605641
  • CVE - 2019-9511
  • DSA-4505
  • DSA-4511
  • DSA-4669
  • RHSA-2019:2692
  • RHSA-2019:2745
  • RHSA-2019:2746
  • RHSA-2019:2775
  • RHSA-2019:2799
  • RHSA-2019:2925
  • RHSA-2019:2939
  • RHSA-2019:2949
  • RHSA-2019:2955
  • RHSA-2019:2966
  • RHSA-2019:3041
  • RHSA-2019:3932
  • RHSA-2019:3933
  • RHSA-2019:3935
  • RHSA-2019:4018
  • RHSA-2019:4019
  • RHSA-2019:4020
  • RHSA-2019:4021
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