CVE-2023-43622

Published Oct 23, 2023

Last updated 2 months ago

Overview

AI description

Generated using AI and has not been reviewed by Intruder. May contain errors.

CVE-2023-43622 is a denial-of-service (DoS) vulnerability affecting Apache HTTP Server versions 2.4.55 through 2.4.57. It involves an attacker establishing an HTTP/2 connection with an initial window size set to zero. This manipulation can cause the server to indefinitely block handling of the connection, effectively tying up resources. The vulnerability resembles the "slow loris" attack pattern, which aims to exhaust server resources and disrupt service. This vulnerability was addressed in Apache HTTP Server version 2.4.58. Upgrading to this or a later version is recommended to mitigate the risk associated with CVE-2023-43622.

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.
Source: security@apache.org
NVD status: Modified

Risk scores

CVSS 3.1

Type: Primary
Base score: 7.5
Impact score: 3.6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity: HIGH

Weaknesses

security@apache.org: CWE-400

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "F9F28355-B47B-463B-862A-E493D0743CC9",
            "versionEndExcluding": "2.4.58",
            "versionStartIncluding": "2.4.55"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]