PT-2022-6998 · Exim+4 · Exim+4

Published 2022-06-06 · Updated 2025-08-07 · CVE-2023-42116

Positive Technologies · (AI Summary)

CVSS v3.1

9.8

Critical

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Exim (affected versions not specified)

Description This issue allows remote attackers to execute arbitrary code on affected installations of Exim. The specific flaw exists within the handling of NTLM challenge requests, resulting from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this issue to execute code in the context of the service account. Authentication is not required to exploit this issue.

Recommendations At the moment, there is no information about a newer version that contains a fix for this issue.

Exploit

Fix

RCE

Buffer Overflow

Stack Overflow

Weakness Enumeration

CWE-119

CWE-121

Related Identifiers

ALT-PU-2023-7644

BDU:2023-06278

CVE-2023-42116

DLA-3599-1

DSA-5512-1

OPENSUSE-SU-2023:0293-1

OPENSUSE-SU-2024:0007-1

OPENSUSE-SU-2024:13282-1

USN-6411-1

ZDI-23-1470

Affected Products

Astra Linux

Exim

Linuxmint

Red Os

Ubuntu

References · 72

• 🔥 https://github.com/isotaka134/cve-2023-42115 · Exploit
• https://osv.dev/vulnerability/DLA-3599-1 · Vendor Advisory
• https://errata.altlinux.org/ALT-PU-2023-7644 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-06276 · Security Note
• https://security-tracker.debian.org/tracker/source-package/exim4 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-42116 · Security Note
• https://security-tracker.debian.org/tracker/DSA-5512-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-6411-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-06268 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-23-1470 · Security Note
• https://ubuntu.com/security/CVE-2023-42114 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-42116 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/699418 · Security Note
• https://bdu.fstec.ru/vul/2023-06278 · Security Note
• https://debian.org/security/2023/dsa-5512 · Vendor Advisory