CVE-2023-42116

03.05.2024, 03:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	8.1 HIGH	NETWORK	HIGH	NONE	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
zdi	CNA	8.1 HIGH				CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA-ADP	ADP	---				---
CVE	ADP	---				---

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: 90%

Debian Releases

Debian Product

Codename

exim4

bullseye	4.94.2-7+deb11u3 fixed
bullseye (security)	4.94.2-7+deb11u4 fixed
bookworm	4.96-15+deb12u6 fixed
bookworm (security)	4.96-15+deb12u5 fixed
trixie	4.98-3 fixed
sid	4.98-3 fixed

Ubuntu Releases

Ubuntu Product

Codename

exim4

mantic	Fixed 4.96-17ubuntu2 released
lunar	Fixed 4.96-14ubuntu1.2 released
jammy	Fixed 4.95-4ubuntu2.3 released
focal	Fixed 4.93-13ubuntu1.8 released
bionic	Fixed 4.90.1-1ubuntu1.10+esm1 released
xenial	Fixed 4.86.2-2ubuntu2.6+esm4 released
trusty	Fixed 4.82-3ubuntu2.4+esm6 released

Common Weakness Enumeration

CWE-121 - Stack-based Buffer Overflow
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

References

https://www.zerodayinitiative.com/advisories/ZDI-23-1470/