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Ubuntu 24.04 LTS Security Advisory USN-6939-1: Exim MIME Bypass

Exim could be made to bypass a MIME filename extension-blocking protection mechanism if it received specially crafted input.. ========================================================================== Ubuntu Security Notice USN-6939-1 July 31, 2024 exim4 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Exim could be made to bypass a MIME filename extension-blocking protection mechanism if it received specially crafted input. Software Description: - exim4: Exim is a mail transport agent Details: Phillip Szelat discovered that Exim misparses multiline MIME header filenames. A remote attacker could use this issue to bypass a MIME filename extension-blocking protection mechanism and possibly deliver executable attachments to the mailboxes of end users. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 24.04 LTS exim4 4.97-4ubuntu4.1 exim4-base 4.97-4ubuntu4.1 eximon4 4.97-4ubuntu4.1 Ubuntu 22.04 LTS exim4 4.95-4ubuntu2.6 exim4-base 4.95-4ubuntu2.6 eximon4 4.95-4ubuntu2.6 Ubuntu 20.04 LTS exim4 4.93-13ubuntu1.12 exim4-base 4.93-13ubuntu1.12 eximon4 4.93-13ubuntu1.12 Ubuntu 18.04 LTS exim4 4.90.1-1ubuntu1.10+esm5 Available with Ubuntu Pro exim4-base 4.90.1-1ubuntu1.10+esm5 Available with Ubuntu Pro eximon4 4.90.1-1ubuntu1.10+esm5 Available with Ubuntu Pro Ubuntu 16.04 LTS exim4 4.86.2-2ubuntu2.6+esm8 Available with Ubuntu Pro exim4-base 4.86.2-2ubuntu2.6+esm8 Available with Ubuntu Pro eximon4 4.86.2-2ubuntu2.6+esm8 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-6939-1 CVE-2024-39929 Package Information: https://launchpad.net/ubuntu/+source/exim4/4.97-4ubuntu4.1 https://launchpad.net/ubuntu/+source/exim4/4.95-4ubuntu2.6 https://launchpad.net/ubuntu/+source/exim4/4.93-13ubuntu1.12 . The recent update for Exim on Ubuntu addresses a flaw that permitted the circumvention of MIME filename safeguards.. Exim Security, Ubuntu Updates, Email Security, MIME Bypass, Linux Advisory. . Severity: Critical. LinuxSecurity.com Team

Jul 31, 2024 •Critical Ubuntu