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FreeBSD : Erlang/OTP -- TLS hostname verification bypass via Subject CommonName fallback and name constraints (93576148-5a54-11f1-b886-4c526214c986)

high Nessus Plugin ID 317390

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 93576148-5a54-11f1-b886-4c526214c986 advisory.

 https://github.com/erlang/otp/security/advisories/GHSA-22cw-4ph4-6447 reports:
 Erlang/OTP's TLS hostname verification implements a legacy RFC 6125 fallback that checks the Subject CommonName when the Subject Alternative Name (SAN) extension is absent, rather than following RFC 9525 which requires validation to fail without SAN. Combined with weak handling of X.509 Name Constraints, this enables man-in-the-middle attacks when an attacker controls a DNS-constrained sub-CA and can intercept network traffic, allowing forgery of certificates for unauthorized domains.

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-22cw-4ph4-6447

http://www.nessus.org/u?95c9de61

Plugin Details

Severity: High

ID: 317390

File Name: freebsd_pkg_935761485a5411f1b8864c526214c986.nasl

Version: 1.3

Type: Local

Published: 5/28/2026

Updated: 5/30/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2026-42790

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:H/A:N

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

CVSS v4

Risk Factor: High

Base Score: 7.6

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:erlang-runtime28, p-cpe:/a:freebsd:freebsd:erlang-runtime27, p-cpe:/a:freebsd:freebsd:erlang-runtime29, cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:erlang

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/28/2026

Vulnerability Publication Date: 5/27/2026

Reference Information

CVE: CVE-2026-42790

IAVA: 2026-A-0522