CVE-2023-42115: exim Out-of-bounds Write

Vulnerability summary

CVE-2023-42115 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in exim. EPSS estimates a 12.09% chance of exploitation in the next 30 days, higher than 96.1% of scored vulnerabilities.

Timeline

1. 03-05-2024
   PublishedVulnerability first disclosed.
2. 20-09-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.