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ubuntucveUbuntu.comUB:CVE-2023-42115
HistorySep 28, 2023 - 12:00 a.m.

CVE-2023-42115

2023-09-2800:00:00
ubuntu.com
ubuntu.com
25
exim
remote execution
vulnerability
buffer overflow
tcp port 25
authentication

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

9.9

Confidence

High

EPSS

0.001

Percentile

32.5%

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.

Notes

Author Note
eslerm no security patches available, see ZDI’s timeline
allenpthuang patches now available, see the thread on Openwall
OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchexim4< 4.93-13ubuntu1.8UNKNOWN
ubuntu22.04noarchexim4< 4.95-4ubuntu2.3UNKNOWN
ubuntu23.04noarchexim4< 4.96-14ubuntu1.2UNKNOWN
ubuntu23.10noarchexim4< 4.96-17ubuntu2UNKNOWN

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

9.9

Confidence

High

EPSS

0.001

Percentile

32.5%