Ubuntu 23.04: USN-6119-1 Critical OpenSSL Denial of Service

ubuntu

May 30, 2023

Several security issues were fixed in OpenSSL.

Summary

Several security issues were fixed in OpenSSL.

Software Description:

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

- openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools

Details:

Matt Caswell discovered that OpenSSL incorrectly handled certain ASN.1

object identifiers. A remote attacker could possibly use this issue to

cause OpenSSL to consume resources, resulting in a denial of service.

(CVE-2023-2650)

Anton Romanov discovered that OpenSSL incorrectly handled AES-XTS cipher

decryption on 64-bit ARM platforms. An attacker could possibly use this

issue to cause OpenSSL to crash, resulting in a denial of service. This

issue only affected Ubuntu 22.04 LTS, Ubuntu 22.10, and Ubuntu 23.04.

(CVE-2023-1255)

Topics Covered

security advisory denial of service critical issue Ubuntu OpenSSL

Update Instructions

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

Ubuntu 23.04:
   libssl3                         3.0.8-1ubuntu1.2

Ubuntu 22.10:
   libssl3                         3.0.5-2ubuntu2.3

Ubuntu 22.04 LTS:
   libssl3                         3.0.2-0ubuntu1.10

Ubuntu 20.04 LTS:
   libssl1.1                       1.1.1f-1ubuntu2.19

Ubuntu 18.04 LTS:
   libssl1.0.0                     1.0.2n-1ubuntu5.13
   libssl1.1                       1.1.1-1ubuntu2.1~18.04.23

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