Out-of-bounds write in Exim - CVE-2023-42115

Vulnerability identifier: #VU81252

CSH Severity: Critical

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-42115

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when handling AUTH command. A remote non-authenticated attacker can send specially crafted data to the server, trigger an out-of-bounds write and execute arbitrary code on the target system.

Exim
Debian Linux
Gentoo Linux
Fedora
Ubuntu
eximon4 (Ubuntu package)
exim4-daemon-heavy (Ubuntu package)
exim4-base (Ubuntu package)
exim4-daemon-light (Ubuntu package)
exim4 (Ubuntu package)
exim4 (Debian package)
exim
mail-mta/exim

Install update from vendor's website.

Exim - addressed in versions 4.96.1, 4.97
eximon4 (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.8, 4.95-4ubuntu2.3, 4.96-14ubuntu1.2
exim4-daemon-heavy (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.8, 4.95-4ubuntu2.3, 4.96-14ubuntu1.2
exim4-base (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.8, 4.95-4ubuntu2.3, 4.96-14ubuntu1.2
exim4-daemon-light (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.8, 4.95-4ubuntu2.3, 4.96-14ubuntu1.2
exim4 (Ubuntu package) - addressed in versions Ubuntu Pro, 4.93-13ubuntu1.8, 4.95-4ubuntu2.3, 4.96-14ubuntu1.2
exim4 (Debian package) - addressed in versions 4.94.2-7+deb11u1, 4.96-15+deb12u2
exim - addressed in versions 4.96.1-1.el7, 4.96.1-1.el8, 4.96.1-1.el9, 4.96.1-1.fc37, 4.96.1-1.fc38, 4.96.1-1.fc39, 4.96.1-1.fc40
mail-mta/exim - update to 4.97.1

• Exploit #10484 - cve-2023-42115 (This module exploits a vulnerability in the target service identified as CVE-2023-42115.) (September 6, 2024)

• https://www.zerodayinitiative.com/advisories/ZDI-23-1469/
• https://www.exim.org/static/doc/security/CVE-2023-zdi.txt

• Multiple vulnerabilities in Exim
• Fedora 40 update for exim
• Fedora 39 update for exim
• Fedora 38 update for exim
• Fedora 37 update for exim
• Fedora EPEL 9 update for exim
• Fedora EPEL 8 update for exim
• Fedora EPEL 7 update for exim
• Debian update for exim4
• Ubuntu update for exim4
• Gentoo update for Exim