FreeBSD : fetchmail -- potential crash when authenticating to SMTP server (21fba35e-a05f-11f0-a8b8-a1ef31191bc1)

medium Nessus Plugin ID 266471

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 21fba35e-a05f-11f0-a8b8-a1ef31191bc1 advisory.

Matthias Andree reports:

fetchmail's SMTP client, when configured to authenticate, is susceptible to a protocol violation where, when a trusted but malicious or malfunctioning SMTP server responds to an authentication request with a 334 code but without a following blank on the line, it will attempt to start reading from memory address 0x1 to parse the server's SASL challenge. This address is constant and not under the attacker's control. This event will usually cause a crash of fetchmail.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

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

Solution

Update the affected packages.

Plugin Details

Severity: Medium

ID: 266471

File Name: freebsd_pkg_21fba35ea05f11f0a8b8a1ef31191bc1.nasl

Version: 1.2

Type: local

Family: FreeBSD Local Security Checks

Published: 10/3/2025

Updated: 10/4/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

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

CVSS Score Source: CVE-2025-61962

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:fetchmail, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 10/3/2025

Vulnerability Publication Date: 10/2/2025

Reference Information

CVE: CVE-2025-61962

Detections

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