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FreeBSD : Erlang/OTP -- timing-based username enumeration in SSH password authentication (d87e7df5-64d4-11f1-ab11-4c526214c986)

medium Nessus Plugin ID 320572

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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 d87e7df5-64d4-11f1-ab11-4c526214c986 advisory.

 https://github.com/erlang/otp/security/advisories/GHSA-3w6p-vwhf-wvp4 reports:
 A timing-based username enumeration vulnerability during password authentication with the user_passwords option has been fixed by performing a dummy PBKDF2 computation for invalid usernames, so authentication timing no longer reveals whether a username exists.

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://github.com/erlang/otp/security/advisories/GHSA-3w6p-vwhf-wvp4

http://www.nessus.org/u?abd54a0c

Plugin Details

Severity: Medium

ID: 320572

File Name: freebsd_pkg_d87e7df564d411f1ab114c526214c986.nasl

Version: 1.3

Type: Local

Published: 6/11/2026

Updated: 6/16/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-48859

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:erlang-runtime29, 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: 6/10/2026

Vulnerability Publication Date: 6/10/2026

Reference Information

CVE: CVE-2026-48859

IAVA: 2026-A-0594