ZDI-CAN-17515: ZDI-23-1470: (0Day) Exim SMTP Challenge Stack-based Buffer Overflow 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 handling of NTLM challenge requests. The issue results 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 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 8.1. The following CVEs are assigned: CVE-2023-42116.

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 for this Exim vulnerability?

The vulnerability ID for this Exim vulnerability is ZDI-CAN-17515.

What is the severity of ZDI-CAN-17515?

The severity of ZDI-CAN-17515 is high with a severity value of 8.1.

How does this vulnerability allow attackers to execute arbitrary code?

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim.

Is authentication required to exploit this vulnerability?

No, authentication is not required to exploit this vulnerability.

Where can I find more information about this vulnerability?

You can find more information about this vulnerability at http://www.zerodayinitiative.com/advisories/ZDI-23-1470/ and https://www.zerodayinitiative.com/advisories/ZDI-23-1470/.