========================================================================== Ubuntu Security Notice USN-6881-1 July 08, 2024 exim4 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS Summary: Exim could be made to allow response injection if it received a specially crafted response. Software Description: - exim4: Exim is a mail transport agent Details: It was discovered that Exim did not enforce STARTTLS sync point on client side. An attacker could possibly use this issue to perform response injection during MTA SMTP sending. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS exim4 4.93-13ubuntu1.11 exim4-base 4.93-13ubuntu1.11 eximon4 4.93-13ubuntu1.11 Ubuntu 18.04 LTS exim4 4.90.1-1ubuntu1.10+esm4 Available with Ubuntu Pro exim4-base 4.90.1-1ubuntu1.10+esm4 Available with Ubuntu Pro eximon4 4.90.1-1ubuntu1.10+esm4 Available with Ubuntu Pro Ubuntu 16.04 LTS exim4 4.86.2-2ubuntu2.6+esm7 Available with Ubuntu Pro exim4-base 4.86.2-2ubuntu2.6+esm7 Available with Ubuntu Pro eximon4 4.86.2-2ubuntu2.6+esm7 Available with Ubuntu Pro Ubuntu 14.04 LTS exim4 4.82-3ubuntu2.4+esm8 Available with Ubuntu Pro exim4-base 4.82-3ubuntu2.4+esm8 Available with Ubuntu Pro eximon4 4.82-3ubuntu2.4+esm8 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-6881-1 CVE-2021-38371 Package Information: https://launchpad.net/ubuntu/+source/exim4/4.93-13ubuntu1.11