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Nginx: Excessive memory usage in HTTP/2 with zero length headers (CVE-2019-9516)

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Nginx: Excessive memory usage in HTTP/2 with zero length headers (CVE-2019-9516)

Severity
7
CVSS
(AV:N/AC:L/Au:S/C:N/I:N/A:C)
Published
08/14/2019
Created
08/15/2019
Added
08/14/2019
Modified
02/16/2023

Description

Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.

Solution(s)

  • nginx-nginx-upgrade-1_16_1
  • nginx-nginx-upgrade-1_17_3

References

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