CVE-2023-42118

Description

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.

How to fix CVE-2023-42118

To remediate CVE-2023-42118, upgrade the affected package to a fixed version below.

• —upgrade to 1.2.11-r3 or later
• —no fix listed

Is CVE-2023-42118 being exploited?

Low — EPSS is 3.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 1.2.11-r3
• from 0

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2023-42118
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2023-42118