Remote denial of service in Apache HTTP server

Published: 2018-07-18

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-8011 CVE-2018-1333
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Apache HTTP Server Server applications / Web servers
Vendor	Apache Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU13907

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8011

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to improper filtering of input data within "mod_md" apache module when processing requests. A remote attacker can send a specially crafted HTTP request to the affected web server and trigger denial of service condition via coredumps.

Mitigation

Update to version 2.4.34.

Vulnerable software versions

Apache HTTP Server: 2.4.0 - 2.4.33

External links

http://www.apache.org/dist/httpd/CHANGES_2.4

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.

2) Improper input validation

EUVDB-ID: #VU13908