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Exim < 4.97.1 SMTP smuggling

medium Nessus Plugin ID 187639

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Synopsis

The remote mail server is potentially affected by a SMTP smuggling vulnerabilities.

Description

Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Exim 4.97.1 or later.

See Also

http://www.nessus.org/u?ab90db8b

Plugin Details

Severity: Medium

ID: 187639

File Name: exim_4_97_1.nasl

Version: 1.2

Type: remote

Published: 1/4/2024

Updated: 2/2/2024

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2023-51766

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:exim:exim

Required KB Items: Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/25/2023

Vulnerability Publication Date: 12/24/2023

Reference Information

CVE: CVE-2023-51766

IAVA: 2024-A-0002