USN-5371-1: nginx vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• nginx - small, powerful, scalable web/proxy server

Details

It was discovered that nginx Lua module mishandled certain inputs.
An attacker could possibly use this issue to perform an HTTP Request
Smuggling attack. This issue was fixed for Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2020-11724)

It was discovered that nginx Lua module mishandled certain inputs.
An attacker could possibly use this issue to disclose sensitive
information. This issue only affects Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2020-36309)

It was discovered that nginx mishandled the use of
compatible certificates among multiple encryption protocols.
If a remote attacker were able to intercept the communication,
this issue could be used to redirect traffic between subdomains.
(CVE-2021-3618)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 21.10

• nginx-light - 1.18.0-6ubuntu11.1
• nginx-extras - 1.18.0-6ubuntu11.1
• nginx-core - 1.18.0-6ubuntu11.1

Ubuntu 20.04

• nginx-light - 1.18.0-0ubuntu1.3
• nginx-extras - 1.18.0-0ubuntu1.3
• libnginx-mod-http-lua - 1.18.0-0ubuntu1.3
• nginx-core - 1.18.0-0ubuntu1.3
• nginx-full - 1.18.0-0ubuntu1.3

Ubuntu 18.04

• nginx-light - 1.14.0-0ubuntu1.10
• nginx-extras - 1.14.0-0ubuntu1.10
• libnginx-mod-http-lua - 1.14.0-0ubuntu1.10
• nginx-core - 1.14.0-0ubuntu1.10
• nginx-full - 1.14.0-0ubuntu1.10

Ubuntu 16.04

• nginx-extras - 1.10.3-0ubuntu0.16.04.5+esm3
  Available with Ubuntu Pro
• nginx-core - 1.10.3-0ubuntu0.16.04.5+esm3
  Available with Ubuntu Pro
• nginx-light - 1.10.3-0ubuntu0.16.04.5+esm3
  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

• CVE-2020-36309
• CVE-2021-3618
• CVE-2020-11724

Related notices

• USN-5371-2: libnginx-mod-http-subs-filter, libnginx-mod-http-image-filter, nginx-light, libnginx-mod-http-echo, libnginx-mod-nchan, nginx-doc, libnginx-mod-stream-geoip2, libnginx-mod-http-ndk, libnginx-mod-http-headers-more-filter, nginx-common, libnginx-mod-rtmp, libnginx-mod-http-geoip, libnginx-mod-stream-geoip, nginx-extras, libnginx-mod-http-uploadprogress, libnginx-mod-http-upstream-fair, libnginx-mod-http-auth-pam, libnginx-mod-http-fancyindex, libnginx-mod-http-dav-ext, libnginx-mod-http-cache-purge, libnginx-mod-http-xslt-filter, libnginx-mod-mail, libnginx-mod-stream, nginx-core, libnginx-mod-http-perl, nginx-full, nginx, libnginx-mod-http-geoip2
• USN-6379-1: vsftpd
• USN-5371-3: nginx-extras, nginx-core, nginx-full, nginx-common, nginx, nginx-light, nginx-doc