nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive CPU usage. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.

An update of the nginx package has been released.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:3681 advisory.

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

  - nginx: Excessive CPU usage via flaw in HTTP/2 implementation (CVE-2018-16844)

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

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:3680 advisory.

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

  - nginx: Excessive CPU usage via flaw in HTTP/2 implementation (CVE-2018-16844)

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

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to it's self reported version, the installed version of Nginx Plus is R1 (built on Open Source version 1.5.3-1) prior to R15-P2 or R16 (built on Open Source version 1.15.2) prior to R16-P1. It is,  therefore, affected by the following issues :

  - An unspecified error exists related to the module     'ngx_http_v2_module' that allows excessive memory usage.
    (CVE-2018-16843)

  - An unspecified error exists related to the module     'ngx_http_v2_module' that allows excessive CPU usage.
    (CVE-2018-16844)

  - An unspecified error exists related to the module     'ngx_http_mp4_module' that allows worker process     crashes or memory disclosure. (CVE-2018-16845)

According to the versions of the nginx packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - nginx before versions 1.15.6 and 1.14.1 has a     vulnerability in the implementation of HTTP/2 that can     allow for excessive memory consumption. This issue     affects nginx compiled with the ngx_http_v2_module (not     compiled by default) if the 'http2' option of the     'listen' directive is used in a configuration     file.(CVE-2018-16843)

  - nginx before versions 1.15.6 and 1.14.1 has a     vulnerability in the implementation of HTTP/2 that can     allow for excessive CPU usage. This issue affects nginx     compiled with the ngx_http_v2_module (not compiled by     default) if the 'http2' option of the 'listen'     directive is used in a configuration     file.(CVE-2018-16844)

  - Some HTTP/2 implementations are vulnerable to resource     loops, potentially leading to a denial of service. The     attacker creates multiple request streams and     continually shuffles the priority of the streams in a     way that causes substantial churn to the priority tree.
    This can consume excess CPU.(CVE-2019-9513)

  - Some HTTP/2 implementations are vulnerable to window     size manipulation and stream prioritization     manipulation, potentially leading to a denial of     service. The attacker requests a large amount of data     from a specified resource over multiple streams. They     manipulate window size and stream priority to force the     server to queue the data in 1-byte chunks. Depending on     how efficiently this data is queued, this can consume     excess CPU, memory, or both.(CVE-2019-9511)

  - Some HTTP/2 implementations are vulnerable to a header     leak, potentially leading to a denial of service. The     attacker sends a stream of headers with a 0-length     header name and 0-length header value, optionally     Huffman encoded into 1-byte or greater headers. Some     implementations allocate memory for these headers and     keep the allocation alive until the session dies. This     can consume excess memory.(CVE-2019-9516)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for nginx fixes the following issues :

Security issues fixed :

  - CVE-2019-9511: Fixed a denial of service by manipulating     the window size and stream prioritization (bsc#1145579).

  - CVE-2019-9513: Fixed a denial of service caused by     resource loops (bsc#1145580).

  - CVE-2019-9516: Fixed a denial of service caused by     header leaks (bsc#1145582).

  - CVE-2018-16845: Fixed denial of service and memory     disclosure via mp4 module (bsc#1115015).

  - CVE-2018-16843: Fixed excessive memory consumption in     HTTP/2 implementation (bsc#1115022).

  - CVE-2018-16844: Fixed excessive CPU usage via flaw in     HTTP/2 implementation (bsc#1115025).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

This update for nginx fixes the following issues :

Security issues fixed :

CVE-2019-9511: Fixed a denial of service by manipulating the window size and stream prioritization (bsc#1145579).

CVE-2019-9513: Fixed a denial of service caused by resource loops (bsc#1145580).

CVE-2019-9516: Fixed a denial of service caused by header leaks (bsc#1145582).

CVE-2018-16845: Fixed denial of service and memory disclosure via mp4 module (bsc#1115015).

CVE-2018-16843: Fixed excessive memory consumption in HTTP/2 implementation (bsc#1115022).

CVE-2018-16844: Fixed excessive CPU usage via flaw in HTTP/2 implementation (bsc#1115025).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its Server response header, the installed version of nginx is 1.x prior to 1.14.1 or 1.15.x prior to 1.15.6. It is, therefore, affected by the following issues :

 - An unspecified error exists related to the module 'ngx_http_v2_module' that allows excessive memory usage. (CVE-2018-16843)

 - An unspecified error exists related to the module 'ngx_http_v2_module' that allows excessive CPU usage. (CVE-2018-16844)

 - An unspecified error exists related to the module 'ngx_http_mp4_module' that allows worker process crashes or memory disclosure. (CVE-2018-16845)

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for nginx fixes the following issues :

nginx was updated to 1.14.2 :

  - Bugfix: nginx could not be built on Fedora 28 Linux.

  - Bugfix: in handling of client addresses when using unix     domain listen sockets to work with datagrams on Linux.

  - Change: the logging level of the 'http request', 'https     proxy request', 'unsupported protocol', 'version too     low', 'no suitable key share', and 'no suitable     signature algorithm' SSL errors has been lowered from     'crit' to 'info'.

  - Bugfix: when using OpenSSL 1.1.0 or newer it was not     possible to switch off 'ssl_prefer_server_ciphers' in a     virtual server if it was switched on in the default     server.

  - Bugfix: nginx could not be built with LibreSSL 2.8.0.

  - Bugfix: if nginx was built with OpenSSL 1.1.0 and used     with OpenSSL 1.1.1, the TLS 1.3 protocol was always     enabled.

  - Bugfix: sending a disk-buffered request body to a gRPC     backend might fail.

  - Bugfix: connections with some gRPC backends might not be     cached when using the 'keepalive' directive.

  - Bugfix: a segmentation fault might occur in a worker     process if the ngx_http_mp4_module was used on 32-bit     platforms.

Changes with nginx 1.14.1 :

  - Security: when using HTTP/2 a client might cause     excessive memory consumption (CVE-2018-16843) and CPU     usage (CVE-2018-16844).

  - Security: processing of a specially crafted mp4 file     with the ngx_http_mp4_module might result in worker     process memory disclosure (CVE-2018-16845).

  - Bugfix: working with gRPC backends might result in     excessive memory consumption.

Changes with nginx 1.13.12 :

  - Bugfix: connections with gRPC backends might be closed     unexpectedly when returning a large response.

Changes with nginx 1.13.10

  - Feature: the 'set' parameter of the 'include' SSI     directive now allows writing arbitrary responses to a     variable; the 'subrequest_output_buffer_size' directive     defines maximum response size.

  - Feature: now nginx uses clock_gettime(CLOCK_MONOTONIC)     if available, to avoid timeouts being incorrectly     triggered on system time changes.

  - Feature: the 'escape=none' parameter of the 'log_format'     directive. Thanks to Johannes Baiter and Calin Don.

  - Feature: the $ssl_preread_alpn_protocols variable in the     ngx_stream_ssl_preread_module.

  - Feature: the ngx_http_grpc_module.

  - Bugfix: in memory allocation error handling in the 'geo'     directive.

  - Bugfix: when using variables in the     'auth_basic_user_file' directive a null character might     appear in logs. Thanks to Vadim Filimonov.

This update for nginx to version 1.14.2 fixes the following issues :

Security vulnerabilities addressed :

CVE-2018-16843 CVE-2018-16844: Fixed an issue whereby a client using HTTP/2 might cause excessive memory consumption and CPU usage (bsc#1115025 bsc#1115022).

CVE-2018-16845: Fixed an issue which might result in worker process memory disclosure whne processing of a specially crafted mp4 file with the ngx_http_mp4_module (bsc#1115015).

Other bug fixes and changes made: Fixed an issue with handling of client addresses when using unix domain listen sockets to work with datagrams on Linux.

The logging level of the 'http request', 'https proxy request', 'unsupported protocol', 'version too low', 'no suitable key share', and 'no suitable signature algorithm' SSL errors has been lowered from 'crit' to 'info'.

Fixed an issue with using OpenSSL 1.1.0 or newer it was not possible to switch off 'ssl_prefer_server_ciphers' in a virtual server if it was switched on in the default server.

Fixed an issue with TLS 1.3 always being enabled when built with OpenSSL 1.1.0 and used with 1.1.1

Fixed an issue with sending a disk-buffered request body to a gRPC backend

Fixed an issue with connections of some gRPC backends might not be cached when using the 'keepalive' directive.

Fixed a segmentation fault, which might occur in a worker process if the ngx_http_mp4_module was used on 32-bit platforms.

Fixed an issue, whereby working with gRPC backends might result in excessive memory consumption.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Security fix for CVE-2018-16843, CVE-2018-16844, CVE-2018-16845 + nginx rebase to 1.14.1.

----

New version 1.14.1

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive memory consumption. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.
(CVE-2018-16843)

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive CPU usage. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file. (CVE-2018-16844)

According to the versions of the nginx package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - nginx before versions 1.15.6 and 1.14.1 has a     vulnerability in the implementation of HTTP/2 that can     allow for excessive memory consumption. This issue     affects nginx compiled with the ngx_http_v2_module (not     compiled by default) if the 'http2' option of the     'listen' directive is used in a configuration     file.(CVE-2018-16843)

  - nginx before versions 1.15.6 and 1.14.1 has a     vulnerability in the implementation of HTTP/2 that can     allow for excessive CPU usage. This issue affects nginx     compiled with the ngx_http_v2_module (not compiled by     default) if the 'http2' option of the 'listen'     directive is used in a configuration     file.(CVE-2018-16844)

  - An instance of missing input sanitization was found in     the mp4 module for nginx. A local attacker could create     a specially crafted video file that, when streamed by     the server, would cause a denial of service (server     crash or hang) and, possibly, information     disclosure.(CVE-2018-16845)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its Server response header, the installed version of nginx is 1.x prior to 1.14.1 or 1.15.x prior to 1.15.6. It is,  therefore, affected by the following issues :

  - An unspecified error exists related to the module     'ngx_http_v2_module' that allows excessive memory usage.
    (CVE-2018-16843)

  - An unspecified error exists related to the module     'ngx_http_v2_module' that allows excessive CPU usage.
    (CVE-2018-16844)

  - An unspecified error exists related to the module     'ngx_http_mp4_module' that allows worker process     crashes or memory disclosure. (CVE-2018-16845)

Three vulnerabilities were discovered in Nginx, a high-performance web and reverse proxy server, which could result in denial of service in processing HTTP/2 (via excessive memory/CPU usage) or server memory disclosure in the ngx_http_mp4_module module (used for server-side MP4 streaming).

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3812-1 advisory.

    It was discovered that nginx incorrectly handled the HTTP/2 implementation. A remote attacker could     possibly use this issue to cause excessive memory consumption, leading to a denial of service. This issue     only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-16843)

    Gal Goldshtein discovered that nginx incorrectly handled the HTTP/2 implementation. A remote attacker     could possibly use this issue to cause excessive CPU usage, leading to a denial of service. This issue     only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-16844)

    It was discovered that nginx incorrectly handled the ngx_http_mp4_module module. A remote attacker could     possibly use this issue with a specially crafted mp4 file to cause nginx to crash, stop responding, or     access arbitrary memory. (CVE-2018-16845)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

NGINX Team reports :

Two security issues were identified in nginx HTTP/2 implementation, which might cause excessive memory consumption (CVE-2018-16843) and CPU usage (CVE-2018-16844).

The issues affect nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.

A security issue was identified in the ngx_http_mp4_module, which might allow an attacker to cause infinite loop in a worker process, cause a worker process crash, or might result in worker process memory isclosure by using a specially crafted mp4 file (CVE-2018-16845).

The issue only affects nginx if it is built with the ngx_http_mp4_module (the module is not built by default) and the 'mp4' directive is used in the configuration file. Further, the attack is only possible if an attacker is able to trigger processing of a specially crafted mp4 file with the ngx_http_mp4_module.

ID	Name	Product	Family	Severity
202802	Photon OS 3.0: Nginx PHSA-2019-3.0-0003	Nessus	PhotonOS Local Security Checks	high
194118	RHEL 7 : rh-nginx114-nginx (RHSA-2018:3681)	Nessus	Red Hat Local Security Checks	medium
194067	RHEL 7 : rh-nginx112-nginx (RHSA-2018:3680)	Nessus	Red Hat Local Security Checks	medium
161696	Nginx Plus R1 < R15-P2 / R16 < R16-P1 Multiple Vulnerabilities	Nessus	Web Servers	medium
129443	EulerOS 2.0 SP8 : nginx (EulerOS-SA-2019-2084)	Nessus	Huawei Local Security Checks	high
128671	openSUSE Security Update : nginx (openSUSE-2019-2120) (0-Length Headers Leak) (Data Dribble) (Resource Loop)	Nessus	SuSE Local Security Checks	medium
128544	SUSE SLES15 Security Update : nginx (SUSE-SU-2019:2309-1) (0-Length Headers Leak) (Data Dribble) (Resource Loop)	Nessus	SuSE Local Security Checks	medium
98597	Nginx 1.15.x < 1.15.6 Multiple Vulnerabilties	Web App Scanning	Component Vulnerability	high
98596	Nginx 1.x < 1.14.1 Multiple Vulnerabilties	Web App Scanning	Component Vulnerability	high
122295	openSUSE Security Update : nginx (openSUSE-2019-195)	Nessus	SuSE Local Security Checks	medium
122147	SUSE SLES15 Security Update : nginx (SUSE-SU-2019:0334-1)	Nessus	SuSE Local Security Checks	medium
122023	Photon OS 2.0: Nginx PHSA-2019-2.0-0117	Nessus	PhotonOS Local Security Checks	high
121900	Photon OS 1.0: Nginx PHSA-2018-1.0-0201	Nessus	PhotonOS Local Security Checks	high
120557	Fedora 29 : 1:nginx (2018-7c540fdab4)	Nessus	Fedora Local Security Checks	medium
119688	Amazon Linux AMI : nginx (ALAS-2018-1125)	Nessus	Amazon Linux Local Security Checks	high
119527	EulerOS 2.0 SP3 : nginx (EulerOS-SA-2018-1399)	Nessus	Huawei Local Security Checks	medium
118956	nginx 1.x < 1.14.1 / 1.15.x < 1.15.6 Multiple Vulnerabilities	Nessus	Web Servers	medium
118840	Debian DSA-4335-1 : nginx - security update	Nessus	Debian Local Security Checks	medium
118820	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : nginx vulnerabilities (USN-3812-1)	Nessus	Ubuntu Local Security Checks	medium
118754	FreeBSD : NGINX -- Multiple vulnerabilities (84ca56be-e1de-11e8-bcfd-00e04c1ea73d)	Nessus	FreeBSD Local Security Checks	medium

Detections

Analytics

CVE-2018-16844

high

Tenable Plugins

high

medium

medium

medium

high

medium

medium

high

high

medium

medium

high

high

medium

high

medium

medium

medium

medium

medium