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CVE-2019-9516

Published: 13 August 2019

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.

Notes

AuthorNote
sbeattie
nginx added http2 support in 1.9.5

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
nginx
Launchpad, Ubuntu, Debian
bionic
Released (1.14.0-0ubuntu1.4)
cosmic Ignored
(end of life, was needed)
disco
Released (1.15.9-0ubuntu1.1)
trusty Not vulnerable
(http2 support not implemented)
upstream Needs triage

xenial
Released (1.10.3-0ubuntu0.16.04.4)
Patches:
upstream: https://github.com/nginx/nginx/commit/dbdd9ffea81d9db46fb88b5eba828f2ad080d388

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H