Remote denial of service in Apache HTTP Server

1) Resource management error

EUVDB-ID: #VU14913

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-11763

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect handling of large SETTINGS frames in HTTP/2 connections. A remote attacker can repeatedly send large SETTINGS frames within an established HTTP/2 connection and consume all available threads and CPU time.

Successful exploitation of the vulnerability may allow an attacker to perform a denial of service (DoS) attack.

Mitigation

Update to version 2.4.35.

Vulnerable software versions

Apache HTTP Server: 2.4.17 - 2.4.34

CPE2.3

• cpe:2.3:a:apache_foundation:apache_http_server:2.4.17:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_http_server:2.4.18:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_http_server:2.4.19:*:*:*:*:*:*:*

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.