Apache 2.4.x < 2.4.27 Multiple Vulnerabilities

critical Nessus Plugin ID 101788
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote web server is affected by multiple vulnerabilities.

Description

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.27. It is, therefore, affected by the following vulnerabilities :

- A denial of service vulnerability exists in httpd due to a failure to initialize or reset the value placeholder in [Proxy-]Authorization headers of type 'Digest' before or between successive key=value assignments by mod_auth_digest. An unauthenticated, remote attacker can exploit this, by providing an initial key with no '=' assignment, to disclose sensitive information or cause a denial of service condition. (CVE-2017-9788)

- A read-after-free error exists in httpd that is triggered when closing a large number of connections. An unauthenticated, remote attacker can exploit this to have an unspecified impact. (CVE-2017-9789)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Apache version 2.4.27 or later.

See Also

https://archive.apache.org/dist/httpd/CHANGES_2.4.27

https://httpd.apache.org/security/vulnerabilities_24.html

Plugin Details

Severity: Critical

ID: 101788

File Name: apache_2_4_27.nasl

Version: 1.14

Type: combined

Agent: windows, macosx, unix

Family: Web Servers

Published: 7/18/2017

Updated: 1/28/2021

Dependencies: apache_http_version.nasl, apache_http_server_nix_installed.nbin, apache_httpd_win_installed.nbin

Risk Information

CVSS Score Source: CVE-2017-9788

VPR

Risk Factor: Medium

Score: 6

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:apache:http_server, cpe:/a:apache:httpd

Required KB Items: installed_sw/Apache

Exploit Ease: No known exploits are available

Patch Publication Date: 7/11/2017

Vulnerability Publication Date: 7/11/2017

Reference Information

CVE: CVE-2017-9788, CVE-2017-9789

BID: 99568, 99569