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Category:   Application (Web Server/CGI)  >   nginx Vendors:   nginx.org
(Red Hat Issues Fix) nginx HTTP/2 Processing Bugs Lets Remote Users Deny Service
SecurityTracker Alert ID:  1042171
SecurityTracker URL:  http://securitytracker.com/id/1042171
CVE Reference:   CVE-2018-16843   (Links to External Site)
Date:  Nov 28 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.9.5 - 1.15.5
Description:   Two vulnerabilities were reported in nginx. A remote user can consume excessive CPU resources on the target system. A remote user can consume excessive memory on the target system.

A remote user can issue a specially crafted HTTP/2 request to cause excessive memory consumption [CVE-2018-16843].

A remote user can issue a specially crafted HTTP/2 request to cause excessive CPU consumption [CVE-2018-16844].

Systems compiled with the ngx_http_v2_module (i.e., not the default) and with the "https" option of the "listen" directive are affected.

Gal Goldshtein from F5 Networks reported one of these vulnerabilities.

Impact:   A remote user can consume excessive CPU resources on the target system.

A remote user can consume excessive memory resources on the target system.

Solution:   Red Hat has issued a fix for CVE-2018-16843.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2018:3653

Vendor URL:  access.redhat.com/errata/RHSA-2018:3653 (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7, 7.4, 7.5, 7.6

Message History:   This archive entry is a follow-up to the message listed below.
Nov 7 2018 nginx HTTP/2 Processing Bugs Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2018:3653-01] Important: rh-nginx110-nginx security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: rh-nginx110-nginx security update
Advisory ID:       RHSA-2018:3653-01
Product:           Red Hat Software Collections
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:3653
Issue date:        2018-11-26
CVE Names:         CVE-2018-16843 CVE-2018-16845 
=====================================================================

1. Summary:

An update for rh-nginx110-nginx is now available for Red Hat Software
Collections.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

nginx is a web and proxy server supporting HTTP and other protocols, with a
focus on high concurrency, performance, and low memory usage.

Security Fix(es):

* nginx: Denial of service and memory disclosure via mp4 module
(CVE-2018-16845)

* nginx: Excessive memory consumption via flaw in HTTP/2 implementation
(CVE-2018-16843)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank the Nginx project for reporting these issues.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

The rh-nginx110-nginx service must be restarted for this update to take
effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1644508 - CVE-2018-16845 nginx: Denial of service and memory disclosure via mp4 module
1644511 - CVE-2018-16843 nginx: Excessive memory consumption via flaw in HTTP/2 implementation

6. Package List:

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6):

Source:
rh-nginx110-nginx-1.10.2-8.el6.1.src.rpm

x86_64:
rh-nginx110-nginx-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-debuginfo-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-http-image-filter-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-http-perl-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-mail-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-stream-1.10.2-8.el6.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6):

Source:
rh-nginx110-nginx-1.10.2-8.el6.1.src.rpm

x86_64:
rh-nginx110-nginx-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-debuginfo-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-http-image-filter-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-http-perl-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-mail-1.10.2-8.el6.1.x86_64.rpm
rh-nginx110-nginx-mod-stream-1.10.2-8.el6.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7):

Source:
rh-nginx110-nginx-1.10.2-8.el7.1.src.rpm

x86_64:
rh-nginx110-nginx-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-debuginfo-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-image-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-perl-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-mail-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-stream-1.10.2-8.el7.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4):

Source:
rh-nginx110-nginx-1.10.2-8.el7.1.src.rpm

x86_64:
rh-nginx110-nginx-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-debuginfo-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-image-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-perl-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-mail-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-stream-1.10.2-8.el7.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5):

Source:
rh-nginx110-nginx-1.10.2-8.el7.1.src.rpm

x86_64:
rh-nginx110-nginx-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-debuginfo-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-image-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-perl-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-mail-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-stream-1.10.2-8.el7.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6):

Source:
rh-nginx110-nginx-1.10.2-8.el7.1.src.rpm

x86_64:
rh-nginx110-nginx-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-debuginfo-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-image-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-perl-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-mail-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-stream-1.10.2-8.el7.1.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7):

Source:
rh-nginx110-nginx-1.10.2-8.el7.1.src.rpm

x86_64:
rh-nginx110-nginx-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-debuginfo-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-image-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-perl-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-http-xslt-filter-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-mail-1.10.2-8.el7.1.x86_64.rpm
rh-nginx110-nginx-mod-stream-1.10.2-8.el7.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2018-16843
https://access.redhat.com/security/cve/CVE-2018-16845
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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