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CVE-2019-9517

Status Candidate

Overview

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

Related Files

Ubuntu Security Notice USN-4113-2
Posted Sep 17, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4113-2 - USN-4113-1 fixed vulnerabilities in the Apache HTTP server. Unfortunately, that update introduced a regression when proxying balancer manager connections in some configurations. This update fixes the problem. Various other issues were also addressed.

tags | advisory, web, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-0197, CVE-2019-10081, CVE-2019-10082, CVE-2019-10092, CVE-2019-10097, CVE-2019-10098, CVE-2019-9517
MD5 | f812825caab42845cee8b7c018c9fa03
Gentoo Linux Security Advisory 201909-04
Posted Sep 6, 2019
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201909-4 - Multiple vulnerabilities have been found in Apache, the worst of which could result in a Denial of Service condition. Versions less than 2.4.41 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2019-10081, CVE-2019-10082, CVE-2019-10092, CVE-2019-10097, CVE-2019-10098, CVE-2019-9517
MD5 | b7e2ec2f187750b6821de061c6e7ef30
Ubuntu Security Notice USN-4113-1
Posted Aug 30, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4113-1 - Stefan Eissing discovered that the HTTP/2 implementation in Apache did not properly handle upgrade requests from HTTP/1.1 to HTTP/2 in some situations. A remote attacker could use this to cause a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. Craig Young discovered that a memory overwrite error existed in Apache when performing HTTP/2 very early pushes in some situations. A remote attacker could use this to cause a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. Various other issues were also addressed.

tags | advisory, remote, web, denial of service
systems | linux, ubuntu
advisories | CVE-2019-0197, CVE-2019-10081, CVE-2019-10082, CVE-2019-10092, CVE-2019-10097, CVE-2019-10098, CVE-2019-9517
MD5 | 599a920f74022391b3784ad5e42c2f5b
Debian Security Advisory 4509-1
Posted Aug 27, 2019
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4509-1 - Several vulnerabilities have been found in the Apache HTTPD server.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2019-10081, CVE-2019-10082, CVE-2019-10092, CVE-2019-10097, CVE-2019-10098, CVE-2019-9517
MD5 | c762ad8dac38c57a0a75b5a2de25f227
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