Slackware Linux 15.0 / current sendmail Vulnerability (SSA:2024-031-01)

medium Nessus Plugin ID 189867


The remote Slackware Linux host is missing a security update to sendmail.


The version of sendmail installed on the remote host is prior to 8.18.1. It is, therefore, affected by a vulnerability as referenced in the SSA:2024-031-01 advisory.

- sendmail through 8.17.2 allows SMTP smuggling in certain 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 sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.

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


Upgrade the affected sendmail package.

See Also

Plugin Details

Severity: Medium

ID: 189867

File Name: Slackware_SSA_2024-031-01.nasl

Version: 1.0

Type: local

Published: 1/31/2024

Updated: 1/31/2024

Supported Sensors: Nessus

Risk Information


Risk Factor: Low

Score: 2.2


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-2023-51765


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: p-cpe:/a:slackware:slackware_linux:sendmail, p-cpe:/a:slackware:slackware_linux:sendmail-cf, cpe:/o:slackware:slackware_linux, cpe:/o:slackware:slackware_linux:15.0

Required KB Items: Host/local_checks_enabled, Host/Slackware/release, Host/Slackware/packages

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/31/2024

Vulnerability Publication Date: 12/24/2023

Reference Information

CVE: CVE-2023-51765