Paper/Archive/CVE-2023-42116

CVE-2023-42116

Exim Exim — Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVSS 9.8 (NVD)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 90.0.900 × 2018.0 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

Exim SMTP Challenge Stack-based Buffer Overflow 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 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. . Was ZDI-CAN-17515.

Affected

ProductAffectedFixed inSource

Eximexim 4.95–CNA

exim< 4.96.14.96.1CISA-ADP

exim< 4.974.97CISA-ADP

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

zdi (CNA)8.1CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refzerodayinitiative.com/advisories/ZDI-23-1470 reflists.debian.org/debian-lts-announce/2023/10/msg00002.html