Out-of-bounds Read in Exim

CVE-2023-42119

Exim dnsdb Out-Of-Bounds Read Information Disclosure Vulnerability. This vulnerability allows network-adjacent attackers to disclose sensitive information 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 read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the service account. . Was ZDI-CAN-17643.

Vulnerability class: Buffer Overflow

EPSS: 0.016 (73.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

  • Exim — versions exim 4.96-RC0-14-24b8ed847-XX

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-42119?
CVE-2023-42119 is a low-severity vulnerability in Exim, classified under Out-of-bounds Read. CVSS score: 3.1/10. Published 2024-05-03.
How severe is CVE-2023-42119?
Low severity. CVSS v3 base score is 3.1 out of 10.
Is CVE-2023-42119 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.