ZDI-CAN-17434: ZDI-23-1469: (0Day) Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability

Published Sep 27, 2023

Updated

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.

Other sources

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 9.8. The following CVEs are assigned: CVE-2023-42115.

Affected Software

1 affected component

Exim Exim

Event History

Sep 27, 2023

Advisory Published

05:00 AM

Data Sourced

05:00 AM

Description

Jan 29, 2025

Advisory Published

via ZDI·11:26 PM

Frequently Asked Questions

What is the vulnerability ID of this Exim vulnerability?

The vulnerability ID of this Exim vulnerability is ZDI-CAN-17434.

What is the title of this vulnerability?

The title of this vulnerability is ZDI-23-1469: (0Day) Exim AUTH Out-Of-Bounds Write Remote Code Execution Vulnerability.

What is the severity level of vulnerability ZDI-CAN-17434?

The severity level of vulnerability ZDI-CAN-17434 is critical with a severity value of 9.8.

How does this vulnerability affect Exim?

This vulnerability affects Exim installations and allows remote attackers to execute arbitrary code.

Is authentication required to exploit this vulnerability?

No, authentication is not required to exploit this vulnerability.