4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
6.1 Medium
AI Score
Confidence
High
0.007 Low
EPSS
Percentile
79.7%
Issue Overview:
In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.(CVE-2018-11763)
Affected Packages:
httpd
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update httpd to update your system.
New Packages:
aarch64:
httpd-2.4.37-1.amzn2.0.1.aarch64
httpd-devel-2.4.37-1.amzn2.0.1.aarch64
httpd-tools-2.4.37-1.amzn2.0.1.aarch64
mod_ssl-2.4.37-1.amzn2.0.1.aarch64
mod_md-2.4.37-1.amzn2.0.1.aarch64
mod_proxy_html-2.4.37-1.amzn2.0.1.aarch64
mod_ldap-2.4.37-1.amzn2.0.1.aarch64
mod_session-2.4.37-1.amzn2.0.1.aarch64
httpd-debuginfo-2.4.37-1.amzn2.0.1.aarch64
i686:
httpd-2.4.37-1.amzn2.0.1.i686
httpd-devel-2.4.37-1.amzn2.0.1.i686
httpd-tools-2.4.37-1.amzn2.0.1.i686
mod_ssl-2.4.37-1.amzn2.0.1.i686
mod_md-2.4.37-1.amzn2.0.1.i686
mod_proxy_html-2.4.37-1.amzn2.0.1.i686
mod_ldap-2.4.37-1.amzn2.0.1.i686
mod_session-2.4.37-1.amzn2.0.1.i686
httpd-debuginfo-2.4.37-1.amzn2.0.1.i686
noarch:
httpd-manual-2.4.37-1.amzn2.0.1.noarch
httpd-filesystem-2.4.37-1.amzn2.0.1.noarch
src:
httpd-2.4.37-1.amzn2.0.1.src
x86_64:
httpd-2.4.37-1.amzn2.0.1.x86_64
httpd-devel-2.4.37-1.amzn2.0.1.x86_64
httpd-tools-2.4.37-1.amzn2.0.1.x86_64
mod_ssl-2.4.37-1.amzn2.0.1.x86_64
mod_md-2.4.37-1.amzn2.0.1.x86_64
mod_proxy_html-2.4.37-1.amzn2.0.1.x86_64
mod_ldap-2.4.37-1.amzn2.0.1.x86_64
mod_session-2.4.37-1.amzn2.0.1.x86_64
httpd-debuginfo-2.4.37-1.amzn2.0.1.x86_64
Red Hat: CVE-2018-11763
Mitre: CVE-2018-11763
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Amazon Linux | 2 | aarch64 | httpd | < 2.4.37-1.amzn2.0.1 | httpd-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | httpd-devel | < 2.4.37-1.amzn2.0.1 | httpd-devel-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | httpd-tools | < 2.4.37-1.amzn2.0.1 | httpd-tools-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | mod_ssl | < 2.4.37-1.amzn2.0.1 | mod_ssl-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | mod_md | < 2.4.37-1.amzn2.0.1 | mod_md-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | mod_proxy_html | < 2.4.37-1.amzn2.0.1 | mod_proxy_html-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | mod_ldap | < 2.4.37-1.amzn2.0.1 | mod_ldap-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | mod_session | < 2.4.37-1.amzn2.0.1 | mod_session-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | aarch64 | httpd-debuginfo | < 2.4.37-1.amzn2.0.1 | httpd-debuginfo-2.4.37-1.amzn2.0.1.aarch64.rpm |
Amazon Linux | 2 | i686 | httpd | < 2.4.37-1.amzn2.0.1 | httpd-2.4.37-1.amzn2.0.1.i686.rpm |
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
6.1 Medium
AI Score
Confidence
High
0.007 Low
EPSS
Percentile
79.7%