Resource management error in Apache HTTP Server - CVE-2018-11763

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Main Vulnerability Database Vulnerabilities #VU14913

Resource management error in Apache HTTP Server - CVE-2018-11763

Published: September 27, 2018


Vulnerability identifier: #VU14913
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2018-11763
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

Apache HTTP Server
Amazon Linux AMI
Opensuse
Fedora
Tenable.sc
apache2 (Alpine package)
mod_http2
Dell Secure Connect Gateway
Oracle Secure Global Desktop

How to mitigate CVE-2018-11763

Update to version 2.4.35.

Apache HTTP Server - update to 2.4.35
Tenable.sc - update to 5.13.0
apache2 (Alpine package) - update to 2.4.35-r0
Dell Secure Connect Gateway - update to 5.12.00.10
mod_http2 - addressed in versions 1.11.1-1.fc27, 1.11.1-1.fc28, 1.11.1-1.fc29

External References

Related Security Bulletins