Resource Exhaustion Affecting httpd24-manual package, versions <0:2.4.58-1.101.amzn1


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.13% (49th percentile)

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  • Snyk IDSNYK-AMZN201803-HTTPD24MANUAL-6045858
  • published4 Nov 2023
  • 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 Amazon-Linux:2018.03 httpd24-manual to version 0:2.4.58-1.101.amzn1 or higher.
This issue was patched in ALAS-2023-1877.

NVD Description

Note: Versions mentioned in the description apply only to the upstream httpd24-manual package and not the httpd24-manual package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 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