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Category:   Application (Web Server/CGI)  >   nginx Vendors:   nginx.org
(Red Hat Issues Fix) nginx DNS Processing Flaws Let Remote Users Deny Service
SecurityTracker Alert ID:  1036308
SecurityTracker URL:  http://securitytracker.com/id/1036308
CVE Reference:   CVE-2016-0742, CVE-2016-0746, CVE-2016-0747   (Links to External Site)
Date:  Jul 14 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.6.18 - 1.9.9
Description:   Several vulnerabilities were reported in nginx. A remote user can consume excessive resources on the target system. A remote user can cause the target service to crash.

A remote user can forge and send specially crafted UDP packets to trigger an invalid pointer dereference and cause the target worker process to crash [CVE-2016-0742].

A remote user can cause the target system to perform CNAME name resolution to trigger a use-after-free memory error and cause the target worker process to crash [CVE-2016-0746]. Other unspecified impacts may occur.

A remote user can cause the target system to perform arbitrary CNAME name resolution to consume excessive resources on the target system [CVE-2016-0747].

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

A remote user can cause the target worker process to crash.

Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2016:1425

Vendor URL:  access.redhat.com/errata/RHSA-2016:1425 (Links to External Site)
Cause:   Access control error, Resource error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 6.6, 6.7, 7, 7.1, 7.2

Message History:   This archive entry is a follow-up to the message listed below.
Jan 29 2016 nginx DNS Processing Flaws Let Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2016:1425-01] Moderate: rh-nginx18-nginx security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: rh-nginx18-nginx security update
Advisory ID:       RHSA-2016:1425-01
Product:           Red Hat Software Collections
Advisory URL:      https://access.redhat.com/errata/RHSA-2016:1425
Issue date:        2016-07-14
CVE Names:         CVE-2016-0742 CVE-2016-0746 CVE-2016-0747 
                   CVE-2016-4450 
=====================================================================

1. Summary:

An update for rh-nginx18-nginx is now available for Red Hat Software
Collections.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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. 6.6) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.1) - x86_64
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.2) - 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 with a focus on high concurrency,
performance, and low memory usage.

The following packages have been upgraded to a newer upstream version:
rh-nginx18-nginx (1.8.1).

Security Fix(es):

* A NULL pointer dereference flaw was found in the nginx code responsible
for saving client request body to a temporary file. A remote attacker could
send a specially crafted request that would cause nginx worker process to
crash. (CVE-2016-4450)

* It was discovered that nginx could perform an out of bound read and
dereference an invalid pointer when resolving CNAME DNS records. An
attacker able to manipulate DNS responses received by nginx could use this
flaw to cause a worker process to crash if nginx enabled the resolver in
its configuration. (CVE-2016-0742)

* A use-after-free flaw was found in the way nginx resolved certain CNAME
DNS records. An attacker able to manipulate DNS responses received by nginx
could use this flaw to cause a worker process to crash or, possibly,
execute arbitrary code if nginx enabled the resolver in its configuration.
(CVE-2016-0746)

* It was discovered that nginx did not limit recursion when resolving CNAME
DNS records. An attacker able to manipulate DNS responses received by nginx
could use this flaw to cause a worker process to use an excessive amount of
resources if nginx enabled the resolver in its configuration.
(CVE-2016-0747)

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-nginx18-nginx service must be restarted for this update to take
effect.

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

1302587 - CVE-2016-0742 nginx: invalid pointer dereference in resolver
1302588 - CVE-2016-0746 nginx: use-after-free during CNAME response processing in resolver
1302589 - CVE-2016-0747 nginx: Insufficient limits of CNAME resolution in resolver
1341462 - CVE-2016-4450 nginx: NULL pointer dereference while writing client request body

6. Package List:

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

Source:
rh-nginx18-nginx-1.8.1-1.el6.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el6.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el6.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.6):

Source:
rh-nginx18-nginx-1.8.1-1.el6.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el6.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el6.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 6.7):

Source:
rh-nginx18-nginx-1.8.1-1.el6.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el6.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el6.x86_64.rpm

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

Source:
rh-nginx18-nginx-1.8.1-1.el6.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el6.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el6.x86_64.rpm

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

Source:
rh-nginx18-nginx-1.8.1-1.el7.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el7.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el7.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.1):

Source:
rh-nginx18-nginx-1.8.1-1.el7.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el7.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el7.x86_64.rpm

Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.2):

Source:
rh-nginx18-nginx-1.8.1-1.el7.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el7.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el7.x86_64.rpm

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

Source:
rh-nginx18-nginx-1.8.1-1.el7.src.rpm

x86_64:
rh-nginx18-nginx-1.8.1-1.el7.x86_64.rpm
rh-nginx18-nginx-debuginfo-1.8.1-1.el7.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-2016-0742
https://access.redhat.com/security/cve/CVE-2016-0746
https://access.redhat.com/security/cve/CVE-2016-0747
https://access.redhat.com/security/cve/CVE-2016-4450
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2016 Red Hat, Inc.
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