Input validation error in Exim - CVE-2024-39929

Vulnerability identifier: #VU94107

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2024-39929

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of RFC 2231 header filename. A remote attacker can bypass a $mime_filename extension-blocking protection mechanism and deliver malicious executable files to the mailboxes.

Exim
Gentoo Linux
Debian Linux
Fedora
Ubuntu
openEuler
SmartFabric Storage Software
eximon4 (Ubuntu package)
exim4 (Ubuntu package)
exim4-base (Ubuntu package)
exim4 (Debian package)
exim-pgsql
exim-mysql
exim
exim-mon
exim-greylist
exim-debugsource
exim-debuginfo
exim-clamav
mail-mta/exim

Install updates from vendor's website.

Exim - update to 4.98
SmartFabric Storage Software - update to 1.4.3
eximon4 (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.12, 4.95-4ubuntu2.6, 4.97-4ubuntu4.1
exim4 (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.12, 4.95-4ubuntu2.6, 4.97-4ubuntu4.1
exim4-base (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.12, 4.95-4ubuntu2.6, 4.97-4ubuntu4.1
exim4 (Debian package) - addressed in versions 4.94.2-7+deb11u3, 4.96-15+deb12u5
exim-pgsql - addressed in versions 4.96-4, 4.97.1-3
exim-mysql - addressed in versions 4.96-4, 4.97.1-3
exim - addressed in versions 4.96-4, 4.97.1-3
exim-mon - addressed in versions 4.96-4, 4.97.1-3
exim-greylist - addressed in versions 4.96-4, 4.97.1-3
exim-debugsource - addressed in versions 4.96-4, 4.97.1-3
exim-debuginfo - addressed in versions 4.96-4, 4.97.1-3
exim-clamav - addressed in versions 4.96-4, 4.97.1-3
exim - addressed in versions 4.98-1.el8, 4.98-1.el9, 4.98-1.fc39, 4.98-1.fc40, 4.98-2.el8
mail-mta/exim - update to 4.99.4

• Exploit #10267 - CVE-2024-39929 (August 2, 2024)

• https://git.exim.org/exim.git/commit/6ce5c70cff8989418e05d01fd2a57703007a6357
• https://git.exim.org/exim.git/commit/1b3209b0577a9327ebb076f3b32b8a159c253f7b
• https://github.com/Exim/exim/compare/exim-4.98-RC2...exim-4.98-RC3
• https://www.rfc-editor.org/rfc/rfc2231.txt
• https://bugs.exim.org/show_bug.cgi?id=3099#c4

• Security restrictions bypass in Exim
• Debian update for exim4
• Ubuntu update for exim4
• Fedora 40 update for exim
• Fedora 39 update for exim
• Fedora EPEL 9 update for exim
• Fedora EPEL 8 update for exim
• Fedora EPEL 8 update for exim
• openEuler 22.03 LTS SP4 update for exim
• openEuler 22.03 LTS SP3 update for exim
• Dell SmartFabric Storage Software update for third-party components
• openEuler 24.03 LTS update for exim
• Gentoo update for Exim