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FreeBSD : p5-Authen-SASL -- Insecure source of randomness (defe9a20-781e-11f0-97c4-40b034429ecf)

medium Nessus Plugin ID 249327

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 defe9a20-781e-11f0-97c4-40b034429ecf advisory.

 p5-Authen-SASL project reports:
 Authen::SASL::Perl::DIGEST_MD5 versions 2.04 through 2.1800 for Perl generates the cnonce insecurely.
 The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function.
 The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header.
 The built-in rand function is unsuitable for cryptographic usage.
 According to RFC 2831, The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation depends on a good choice.
 It is RECOMMENDED that it contain at least 64 bits of entropy.

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-2025-40918

http://www.nessus.org/u?ce2b5749

Plugin Details

Severity: Medium

ID: 249327

File Name: freebsd_pkg_defe9a20781e11f097c440b034429ecf.nasl

Version: 1.1

Type: local

Published: 8/14/2025

Updated: 8/14/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.3

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2025-40918

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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: 8/13/2025

Vulnerability Publication Date: 7/16/2025

Reference Information

CVE: CVE-2025-40918