==========================================================================
Ubuntu Security Notice USN-6754-1
April 25, 2024

nghttp2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in nghttp2.

Software Description:
- nghttp2: HTTP/2 C Library and tools

Details:

It was discovered that nghttp2 incorrectly handled the HTTP/2
implementation. A remote attacker could possibly use this issue to cause
nghttp2 to consume resources, leading to a denial of service. This issue
only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-9511,
CVE-2019-9513)

It was discovered that nghttp2 incorrectly handled request cancellation. A
remote attacker could possibly use this issue to cause nghttp2 to consume
resources, leading to a denial of service. This issue only affected Ubuntu
16.04 LTS and Ubuntu 18.04 LTS. (CVE-2023-44487)

It was discovered that nghttp2 could be made to process an unlimited number
of HTTP/2 CONTINUATION frames. A remote attacker could possibly use this
issue to cause nghttp2 to consume resources, leading to a denial of
service. (CVE-2024-28182)

Update instructions:

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

Ubuntu 23.10:
   libnghttp2-14                   1.55.1-1ubuntu0.2
   nghttp2                         1.55.1-1ubuntu0.2
   nghttp2-client                  1.55.1-1ubuntu0.2
   nghttp2-proxy                   1.55.1-1ubuntu0.2
   nghttp2-server                  1.55.1-1ubuntu0.2

Ubuntu 22.04 LTS:
   libnghttp2-14                   1.43.0-1ubuntu0.2
   nghttp2                         1.43.0-1ubuntu0.2
   nghttp2-client                  1.43.0-1ubuntu0.2
   nghttp2-proxy                   1.43.0-1ubuntu0.2
   nghttp2-server                  1.43.0-1ubuntu0.2

Ubuntu 20.04 LTS:
   libnghttp2-14                   1.40.0-1ubuntu0.3
   nghttp2                         1.40.0-1ubuntu0.3
   nghttp2-client                  1.40.0-1ubuntu0.3
   nghttp2-proxy                   1.40.0-1ubuntu0.3
   nghttp2-server                  1.40.0-1ubuntu0.3

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   libnghttp2-14                   1.30.0-1ubuntu1+esm2
   nghttp2                         1.30.0-1ubuntu1+esm2
   nghttp2-client                  1.30.0-1ubuntu1+esm2
   nghttp2-proxy                   1.30.0-1ubuntu1+esm2
   nghttp2-server                  1.30.0-1ubuntu1+esm2

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   libnghttp2-14                   1.7.1-1ubuntu0.1~esm2
   nghttp2                         1.7.1-1ubuntu0.1~esm2
   nghttp2-client                  1.7.1-1ubuntu0.1~esm2
   nghttp2-proxy                   1.7.1-1ubuntu0.1~esm2
   nghttp2-server                  1.7.1-1ubuntu0.1~esm2

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

References:
   https://ubuntu.com/security/notices/USN-6754-1
   CVE-2019-9511, CVE-2019-9513, CVE-2023-44487, CVE-2024-28182

Package Information:
   https://launchpad.net/ubuntu/+source/nghttp2/1.55.1-1ubuntu0.2
   https://launchpad.net/ubuntu/+source/nghttp2/1.43.0-1ubuntu0.2
   https://launchpad.net/ubuntu/+source/nghttp2/1.40.0-1ubuntu0.3