Ubuntu alert USN-6435-1 (openssl)

From:
             
 
Ian Constantin <ian.constantin@canonical.com>
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-6435-1] OpenSSL vulnerabilities
Date:
             
 
Wed, 18 Oct 2023 23:25:56 +0300
Message-ID:
             
 
<e76a0c59-931d-4c9e-8256-745e852b25f9@canonical.com>
==========================================================================
Ubuntu Security Notice USN-6435-1
October 18, 2023

openssl vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

OpenSSL could be made to consume resources and cause long delays
if it processed certain input.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

It was discovered that OpenSSL incorrectly handled excessively large
Diffie-Hellman parameters. An attacker could possibly use this issue
to cause a denial of service. (CVE-2023-3446)

Bernd Edlinger discovered that OpenSSL incorrectly handled excessively
large Diffie-Hellman parameters. An attacker could possibly use this
issue to cause a denial of service. (CVE-2023-3817)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   libssl1.1                        1.1.1-1ubuntu2.1~18.04.23+esm1
   openssl                         1.1.1-1ubuntu2.1~18.04.23+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   libssl1.0.0                     1.0.2g-1ubuntu4.20+esm10
   openssl                         1.0.2g-1ubuntu4.20+esm10

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-6435-1
   CVE-2023-3446, CVE-2023-3817