CVE-2023-42118

Publication date 3 May 2024

Last updated 30 May 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Exim libspf2 Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Exim libspf2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the parsing of SPF macros. When parsing SPF macros, the process does not properly validate user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-17578.

Read the notes from the security team

Status

Package Ubuntu Release Status
exim4 25.04 plucky
Vulnerable, fix deferred
24.10 oracular
Vulnerable, fix deferred
24.04 LTS noble
Vulnerable, fix deferred
23.10 mantic Ignored end of life, was deferred [2024-09-19]
23.04 lunar Ignored end of life, was deferred [2024-09-19]
22.04 LTS jammy
Vulnerable, fix deferred
20.04 LTS focal
Vulnerable, fix deferred
18.04 LTS bionic
Vulnerable, fix deferred
16.04 LTS xenial
Vulnerable, fix deferred
14.04 LTS trusty
Vulnerable, fix deferred
libspf2 25.04 plucky
Vulnerable, fix deferred
24.10 oracular
Vulnerable, fix deferred
24.04 LTS noble
Vulnerable, fix deferred
23.10 mantic Ignored end of life, was deferred [2024-09-19]
23.04 lunar Ignored end of life, was deferred [2024-09-19]
22.04 LTS jammy
Vulnerable, fix deferred
20.04 LTS focal
Vulnerable, fix deferred
18.04 LTS bionic
Vulnerable, fix deferred
16.04 LTS xenial
Vulnerable, fix deferred
14.04 LTS trusty Ignored end of standard support

Notes

eslerm

no security patches available, see ZDI’s timeline ZDI claims this is Exim’s issue, Exim claims this is libspf2’s

mdeslaur

as of 2024-10-22, still not enough details from ZDI to know what this CVE is.

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Adjacent
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H