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FreeBSD : Erlang/OTP -- (D)TLS-1.2 server certificate verification bypass (445c61c0-89e1-11f1-b35c-4c526214c986)

critical Nessus Plugin ID 330268

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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 445c61c0-89e1-11f1-b35c-4c526214c986 advisory.

 https://github.com/erlang/otp/security/advisories/GHSA-c6cw-pr89-w882 reports:
 The OTP TLS/DTLS client (pre TLS-1.3) does not verify that the cipher suite selected by the server in ServerHello is one of those offered in ClientHello. A man-in-the-middle attacker can select an anonymous cipher suite such as ECDH_anon that was never offered by the client. Since anonymous suites do not require a server certificate, this completely bypasses the client's verify_peer setting, giving the attacker a fully established connection without possessing any trusted certificate, and thus complete read and modify access to the transmitted data. TLS-1.3 is not affected.

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-c6cw-pr89-w882

http://www.nessus.org/u?346baccf

Plugin Details

Severity: Critical

ID: 330268

File Name: freebsd_pkg_445c61c089e111f1b35c4c526214c986.nasl

Version: 1.3

Type: Local

Published: 7/28/2026

Updated: 8/12/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

Percentile: 96.63

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-55953

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.1

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:erlang-runtime27, p-cpe:/a:freebsd:freebsd:erlang-runtime28, p-cpe:/a:freebsd:freebsd:erlang-runtime29, 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: 7/27/2026

Vulnerability Publication Date: 7/27/2026

Reference Information

CVE: CVE-2026-55953

IAVA: 2026-A-0785