Rapid7 Vulnerability & Exploit Database

Red Hat: CVE-2023-43622: httpd: mod_http2: DoS in HTTP/2 with initial window size 0 (Multiple Advisories)

Free InsightVM Trial No Credit Card Necessary
2024 Attack Intel Report Latest research by Rapid7 Labs
Back to Search

Red Hat: CVE-2023-43622: httpd: mod_http2: DoS in HTTP/2 with initial window size 0 (Multiple Advisories)

Severity
8
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Published
10/23/2023
Created
05/01/2024
Added
05/01/2024
Modified
09/03/2024

Description

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.

Solution(s)

  • redhat-upgrade-mod_http2
  • redhat-upgrade-mod_http2-debuginfo
  • redhat-upgrade-mod_http2-debugsource

References

  • CVE-2023-43622
  • RHSA-2024:2368

insightVM

Advanced vulnerability management analytics and reporting.
Key Features
Free InsightVM Trial View All Features

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;