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CVE-2023-43622

Status Candidate

Overview

An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue.

Related Files

Red Hat Security Advisory 2024-2368-03
Posted Apr 30, 2024
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2024-2368-03 - An update for mod_http2 is now available for Red Hat Enterprise Linux 9. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2023-43622
SHA-256 | 0f5aa200c9600539480d0e610eaa416fe914f44d18db901641229f81dadf01f1
Debian Security Advisory 5662-1
Posted Apr 17, 2024
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5662-1 - Multiple vulnerabilities have been discovered in the Apache HTTP server, which may result in HTTP response splitting or denial of service.

tags | advisory, web, denial of service, vulnerability
systems | linux, debian
advisories | CVE-2023-31122, CVE-2023-38709, CVE-2023-43622, CVE-2023-45802, CVE-2024-24795, CVE-2024-27316
SHA-256 | 91dd197c5a6d8baaed2ebca649cbbb006dfaa18a448d23acca955357225d36eb
Ubuntu Security Notice USN-6506-1
Posted Nov 22, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6506-1 - David Shoon discovered that the Apache HTTP Server mod_macro module incorrectly handled certain memory operations. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. Prof. Sven Dietrich, Isa Jafarov, Prof. Heejo Lee, and Choongin Lee discovered that the Apache HTTP Server incorrectly handled certain HTTP/2 connections. A remote attacker could possibly use this issue to cause the server to consume resources, leading to a denial of service. This issue only affected Ubuntu 23.04, and Ubuntu 23.10.

tags | advisory, remote, web, denial of service
systems | linux, ubuntu
advisories | CVE-2023-31122, CVE-2023-43622, CVE-2023-45802
SHA-256 | 8a919d1a4d307c69872670d645ac6969f558a3c26282d75583807e9eb42825c5
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