VAR-201908-0263

Vulnerability from variot - Updated: 2026-04-10 22:30

Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU. Multiple HTTP/2 implementations are vulnerable to a variety of denial-of-service (DoS) attacks. HTTP/2 is the second version of the hypertext transfer protocol, which is mainly used to ensure the communication between the client and the server. A resource management error vulnerability exists in HTTP/2. A vulnerability in the HTTP/2 implementation of Nginx could allow an unauthenticated, remote malicious user to cause a denial of service (DoS) condition on a targeted system. The vulnerability is due to improper priority changes in the affected software that could lead to excessive CPU usage. An attacker could exploit this vulnerability by sending a request that submits malicious input to an affected system. A successful exploit could result in a DoS condition on the targeted system. nginx.org has confirmed the vulnerability and released software updates. ========================================================================== Ubuntu Security Notice USN-6754-1 April 25, 2024

nghttp2 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 23.10
Ubuntu 22.04 LTS
Ubuntu 20.04 LTS
Ubuntu 18.04 LTS (Available with Ubuntu Pro)
Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in nghttp2.

Software Description: - nghttp2: HTTP/2 C Library and tools

Details:

It was discovered that nghttp2 incorrectly handled the HTTP/2 implementation. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-9511, CVE-2019-9513)

It was discovered that nghttp2 incorrectly handled request cancellation. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2023-44487)

It was discovered that nghttp2 could be made to process an unlimited number of HTTP/2 CONTINUATION frames. (CVE-2024-28182)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 23.10: libnghttp2-14 1.55.1-1ubuntu0.2 nghttp2 1.55.1-1ubuntu0.2 nghttp2-client 1.55.1-1ubuntu0.2 nghttp2-proxy 1.55.1-1ubuntu0.2 nghttp2-server 1.55.1-1ubuntu0.2

Ubuntu 22.04 LTS: libnghttp2-14 1.43.0-1ubuntu0.2 nghttp2 1.43.0-1ubuntu0.2 nghttp2-client 1.43.0-1ubuntu0.2 nghttp2-proxy 1.43.0-1ubuntu0.2 nghttp2-server 1.43.0-1ubuntu0.2

Ubuntu 20.04 LTS: libnghttp2-14 1.40.0-1ubuntu0.3 nghttp2 1.40.0-1ubuntu0.3 nghttp2-client 1.40.0-1ubuntu0.3 nghttp2-proxy 1.40.0-1ubuntu0.3 nghttp2-server 1.40.0-1ubuntu0.3

Ubuntu 18.04 LTS (Available with Ubuntu Pro): libnghttp2-14 1.30.0-1ubuntu1+esm2 nghttp2 1.30.0-1ubuntu1+esm2 nghttp2-client 1.30.0-1ubuntu1+esm2 nghttp2-proxy 1.30.0-1ubuntu1+esm2 nghttp2-server 1.30.0-1ubuntu1+esm2

Ubuntu 16.04 LTS (Available with Ubuntu Pro): libnghttp2-14 1.7.1-1ubuntu0.1~esm2 nghttp2 1.7.1-1ubuntu0.1~esm2 nghttp2-client 1.7.1-1ubuntu0.1~esm2 nghttp2-proxy 1.7.1-1ubuntu0.1~esm2 nghttp2-server 1.7.1-1ubuntu0.1~esm2

In general, a standard system update will make all the necessary changes. Description:

Node.js is a software development platform for building fast and scalable network applications in the JavaScript programming language.

The following packages have been upgraded to a later upstream version: rh-nodejs8-nodejs (8.16.1). 7) - noarch, x86_64

Description:

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Important: rh-nginx110-nginx security update Advisory ID: RHSA-2019:2745-01 Product: Red Hat Software Collections Advisory URL: https://access.redhat.com/errata/RHSA-2019:2745 Issue date: 2019-09-12 CVE Names: CVE-2019-9511 CVE-2019-9513 CVE-2019-9516 ==================================================================== 1. Summary:

An update for rh-nginx110-nginx is now available for Red Hat Software Collections.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Relevant releases/architectures:

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) - x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) - x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) - x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) - x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) - x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) - x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) - x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Description:

nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage.

Security Fix(es):

HTTP/2: large amount of data request leads to denial of service (CVE-2019-9511)
HTTP/2: flood using PRIORITY frames resulting in excessive resource consumption (CVE-2019-9513)
HTTP/2: 0-length headers leads to denial of service (CVE-2019-9516)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The rh-nginx110-nginx service must be restarted for this update to take effect.

Package List:

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6):

Source: rh-nginx110-nginx-1.10.2-9.el6.1.src.rpm

x86_64: rh-nginx110-nginx-1.10.2-9.el6.1.x86_64.rpm rh-nginx110-nginx-debuginfo-1.10.2-9.el6.1.x86_64.rpm rh-nginx110-nginx-mod-http-image-filter-1.10.2-9.el6.1.x86_64.rpm rh-nginx110-nginx-mod-http-perl-1.10.2-9.el6.1.x86_64.rpm rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-9.el6.1.x86_64.rpm rh-nginx110-nginx-mod-mail-1.10.2-9.el6.1.x86_64.rpm rh-nginx110-nginx-mod-stream-1.10.2-9.el6.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6):

Source: rh-nginx110-nginx-1.10.2-9.el6.1.src.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7):