Headline
Red Hat Security Advisory 2023-6084-01
Red Hat Security Advisory 2023-6084-01 - Updated images are now available for Red Hat Advanced Cluster Security. The updated image includes new features and bug fixes. Issues addressed include a denial of service vulnerability.
The following data is constructed from data provided by Red Hat’s json file at:
https://access.redhat.com/security/data/csaf/v2/advisories/2023/rhsa-2023_6084.json
Red Hat officially shut down their mailing list notifications October 10, 2023. Due to this, Packet Storm has recreated the below data as a reference point to raise awareness. It must be noted that due to an inability to easily track revision updates without crawling Red Hat’s archive, these advisories are single notifications and we strongly suggest that you visit the Red Hat provided links to ensure you have the latest information available if the subject matter listed pertains to your environment.
- Packet Storm Staff
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Red Hat Security Advisory
Synopsis: Important: RHACS 3.74 enhancement and security update
Advisory ID: RHSA-2023:6084-01
Product: Red Hat Advanced Cluster Security for Kubernetes
Advisory URL: https://access.redhat.com/errata/RHSA-2023:6084
Issue date: 2023-10-24
Revision: 01
CVE Names: CVE-2023-39325
====================================================================
Summary:
Updated images are now available for Red Hat Advanced Cluster Security. The
updated image includes new features and bug fixes.
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.
Description:
This release of RHACS 3.74.7 includes fixes for the following security
vulnerabilities:
golang: net/http, x/net/http2: rapid stream resets can cause excessive
work
(CVE-2023-39325)HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS
attack
(Rapid Reset Attack) (CVE-2023-44487)Various CVEs in containers for glibc security issues
A Red Hat Security Bulletin which addresses further details about this flaw
is
available in the References section.
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.
RHACS 3.74.7 includes a new default policy called "Rapid Reset: Denial of
Service
Vulnerability in HTTP/2 Protocol". This policy alerts on deployments with
images
containing components that are susceptible to a Denial of Service (DoS)
vulnerability for HTTP/2 servers, based on CVE-2023-44487 and
CVE-2023-39325.
This policy applies to the build or deploy life cycle stage.
Solution:
CVEs:
CVE-2023-39325
References:
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/RHSB-2023-003
https://docs.openshift.com/acs/3.74/release_notes/374-release-notes.html
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A malicious HTTP/2 client which rapidly creates requests and immediately resets them can cause excessive server resource consumption. While the total number of requests is bounded by the http2.Server.MaxConcurrentStreams setting, resetting an in-progress request allows the attacker to create a new request while the existing one is still executing. With the fix applied, HTTP/2 servers now bound the number of simultaneously executing handler goroutines to the stream concurrency limit (MaxConcurrentStreams). New requests arriving when at the limit (which can only happen after the client has reset an existing, in-flight request) will be queued until a handler exits. If the request queue grows too large, the server will terminate the connection. This issue is also fixed in golang.org/x/net/http2 for users manually configuring HTTP/2. The default stream concurrency limit is 250 streams (requests) per HTTP/2 connection. This value may be adjusted using the golang.org/x/net/http2 package; s...
Amazon Web Services (AWS), Cloudflare, and Google on Tuesday said they took steps to mitigate record-breaking distributed denial-of-service (DDoS) attacks that relied on a novel technique called HTTP/2 Rapid Reset. The layer 7 attacks were detected in late August 2023, the companies said in a coordinated disclosure. The cumulative susceptibility to this attack is being tracked as CVE-2023-44487,
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.