CVE-2023-43622
Apache HTTP Server: DoS in HTTP/2 with initial windows size 0
Summary
Apache HTTP Server: DoS in HTTP/2 with initial windows size 0
Original description
The description as published by the source.
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.
Affected packages
Bitnami
apache
[{"type":"SEMVER","events":[{"introduced":"2.4.55"},{"fixed":"2.4.58"}]}]
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2023-43622 apache2 Fixed in: 2.4.58-r0
- Debian DEBIAN-CVE-2023-43622 apache2 Fixed in: 2.4.59-1~deb11u1
References
- advisory httpd.apache.org
- advisory security.netapp.com
- web nvd.nist.gov