Resource Exhaustion Affecting apache2 package, versions <2.4.58-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.12% (49th percentile)

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  • Snyk IDSNYK-ALPINE320-APACHE2-7008192
  • published23 May 2024
  • disclosed23 Oct 2023

Introduced: 23 Oct 2023

CVE-2023-43622  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade Alpine:3.20 apache2 to version 2.4.58-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream apache2 package and not the apache2 package as distributed by Alpine. See How to fix? for Alpine:3.20 relevant fixed versions and status.

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.

CVSS Scores

version 3.1