VAR-201908-0421

Vulnerability from variot - Updated: 2026-04-10 22:52

Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both. 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 authenticated, remote malicious user to cause a denial of service (DoS) condition on a targeted system. The vulnerability is due to improper window manipulation in the affected software that could lead to excessive CPU usage. An attacker could exploit this vulnerability by manipulating window sizes on 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.

For the stable distribution (buster), these problems have been fixed in version 10.19.0~dfsg1-1.

We recommend that you upgrade your nodejs packages.

For the detailed security status of nodejs please refer to its security tracker page at: https://security-tracker.debian.org/tracker/nodejs

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE-----

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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. A remote attacker could possibly use this issue to cause nghttp2 to consume resources, leading to a denial of service. 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. A remote attacker could possibly use this issue to cause nghttp2 to consume resources, leading to a denial of service. 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. A remote attacker could possibly use this issue to cause nghttp2 to consume resources, leading to a denial of service. (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:

Red Hat OpenShift Service Mesh is Red Hat's distribution of the Istio service mesh project, tailored for installation into an on-premise OpenShift Container Platform installation.

This advisory covers the RPM packages for the OpenShift Service Mesh 1.0.1 release. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied. JIRA issues fixed (https://issues.jboss.org/):

MAISTRA-977 - Rebuild RPMs for 1.0.1 release

Description:

AMQ Broker is a high-performance messaging implementation based on ActiveMQ Artemis. It uses an asynchronous journal for fast message persistence, and supports multiple languages, protocols, and platforms. Solution:

Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.

The References section of this erratum contains a download link (you must log in to download the update). Summary:

Updated Quay packages that fix several bugs and add various enhancements are now available.

Bug Fix(es):

Fixed repository mirror credentials properly escaped to allow special characters
Fixed repository mirror UI cancel button enabled
Fixed repository mirror UI change next sync date
Solution:

Please download the release images via:

quay.io/redhat/quay:v3.1.1 quay.io/redhat/clair-jwt:v3.1.1 quay.io/redhat/quay-builder:v3.1.1

Description:

Red Hat JBoss Enterprise Application Platform CD18 is a platform for Java applications based on the WildFly application runtime.

You must restart the JBoss server process for the update to take effect. Description:

This release adds the new Apache HTTP Server 2.4.37 packages that are part of the JBoss Core Services offering.

This release serves as a replacement for Red Hat JBoss Core Services Pack Apache Server 2.4.29 and includes bug fixes and enhancements. Refer to the Release Notes for information on the most significant bug fixes and enhancements included in this release. After installing the updated packages, the httpd daemon will be restarted automatically. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

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

Synopsis: Important: rh-nginx112-nginx security update Advisory ID: RHSA-2019:2746-01 Product: Red Hat Software Collections Advisory URL: https://access.redhat.com/errata/RHSA-2019:2746 Issue date: 2019-09-12 CVE Names: CVE-2019-9511 CVE-2019-9513 CVE-2019-9516 ==================================================================== 1. Summary:

An update for rh-nginx112-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. 7) - aarch64, ppc64le, s390x, x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) - ppc64le, s390x, x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) - ppc64le, s390x, x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) - ppc64le, s390x, x86_64 Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) - ppc64le, s390x, 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-nginx112-nginx service must be restarted for this update to take effect.

Bugs fixed (https://bugzilla.redhat.com/):

1735741 - CVE-2019-9513 HTTP/2: flood using PRIORITY frames resulting in excessive resource consumption 1741860 - CVE-2019-9511 HTTP/2: large amount of data request leads to denial of service 1741864 - CVE-2019-9516 HTTP/2: 0-length headers leads to denial of service

Package List:

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