Allocation of Resources Without Limits or Throttling

Affecting nginx package, versions <1.10.3-1+deb9u3

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Overview

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.

References

CVSS Score

6.5
medium severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    Low
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    None
  • Availability
    High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVE
CVE-2019-9516
CWE
CWE-400 CWE-770
Snyk ID
SNYK-DEBIAN9-NGINX-459560
Disclosed
13 Aug, 2019
Published
13 Aug, 2019