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FreeBSD : p5-Authen-SASL -- Replay attack in Authen::SASL::Perl::DIGEST_MD5 (023a3d0c-b987-11f1-ad2b-40b034429ecf)

critical Nessus Plugin ID 350787

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 023a3d0c-b987-11f1-ad2b-40b034429ecf advisory.

 Authen-SASL project reports:
 Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step.
 server_start generates a fresh nonce and sends it in the challenge, and nothing later compares that value against the nonce the client returns.
 server_step derives the expected digest from the client's own parameters, so a response verifies whenever its digest matches the nonce it carries.
 The count table it also checks is keyed on the client-supplied nonce and starts empty in each new server object, so a captured first response, carrying `nc=00000001`, passes that too. RFC 2831 defines the nonce in the response as the value the server sent in the preceding challenge. An attacker who observes one successful `qop=auth` exchange can replay the captured response against a later session for the same service, host, realm and user, and authenticate as that user without knowing the password.

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.

See Also

https://nvd.nist.gov/vuln/detail/cve-2026-86219

http://www.nessus.org/u?2bb5bbee

Plugin Details

Severity: Critical

ID: 350787

File Name: freebsd_pkg_023a3d0cb98711f1ad2b40b034429ecf.nasl

Version: 1.1

Type: Local

Published: 9/26/2026

Updated: 9/26/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.32

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-86219

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:p5-authen-sasl

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/26/2026

Vulnerability Publication Date: 9/6/2026

Reference Information

CVE: CVE-2026-86219