CVE-2023-42115

EUVD-2023-46574
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
zdiCNA
9.8 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 98%
Affected Products (NVD)
VendorProductVersion
eximexim
𝑥
< 4.96.1
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
exim4
bookworm
4.96-15+deb12u6
fixed
bookworm (security)
4.96-15+deb12u5
fixed
bullseye
4.94.2-7+deb11u3
fixed
bullseye (security)
4.94.2-7+deb11u4
fixed
buster
not-affected
sid
4.98-3
fixed
trixie
4.98-3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
exim4
bionic
not-affected
focal
Fixed 4.93-13ubuntu1.8
released
jammy
Fixed 4.95-4ubuntu2.3
released
lunar
Fixed 4.96-14ubuntu1.2
released
mantic
Fixed 4.96-17ubuntu2
released
trusty
not-affected
xenial
not-affected
Common Weakness Enumeration
References
https://www.zerodayinitiative.com/advisories/ZDI-23-1469/
https://www.zerodayinitiative.com/advisories/ZDI-23-1469/