CVE-2023-42115 Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability

2024-05-0302:13:23

CWE-787

zdi

github.com

exim

remote code execution

vulnerability

tcp port 25

buffer overflow

zdi-can-17434

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

9.1

Confidence

High

EPSS

0.001

Percentile

29.6%

SSVC

Exploitation

poc

Automatable

yes

Technical Impact

total

JSON

Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the smtp service, which listens on TCP port 25 by default. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of a buffer. An attacker can leverage this vulnerability to execute code in the context of the service account.
. Was ZDI-CAN-17434.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*"
    ],
    "vendor": "exim",
    "product": "exim",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "lessThan": "4.95",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  }
]