Apache 2.4.x < 2.4.27 Multiple Vulnerabilities

Medium Nessus Plugin ID 101788


The remote web server is affected by multiple vulnerabilities.


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.


Upgrade to Apache version 2.4.27 or later.

See Also



Plugin Details

Severity: Medium

ID: 101788

File Name: apache_2_4_27.nasl

Version: 1.12

Type: remote

Family: Web Servers

Published: 2017/07/18

Updated: 2018/12/13

Dependencies: 48204

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2017-9788

CVSS v2.0

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

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: CVSS:3.0/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 Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2017/07/11

Vulnerability Publication Date: 2017/07/11

Reference Information

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

BID: 99568, 99569