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FreeBSD : erlang -- SSH plaintext recovery attack against CBC ciphers (0b58454e-8ff3-11f1-b35c-4c526214c986)

low Nessus Plugin ID 333205

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 0b58454e-8ff3-11f1-b35c-4c526214c986 advisory.

 The Erlang/OTP team reports:
 The SSH client and server now reject incoming packets not aligned to the cipher block size as required by RFC 4253 section 6. For CBC ciphers, a timing-safe packet discard mechanism (CVE-2008-5161 mitigation) ensures structural errors are indistinguishable from MAC failures before disconnecting.
 AEAD and encrypt-then-MAC modes disconnect immediately.

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/pull/11110

https://nvd.nist.gov/vuln/detail/CVE-2008-5161

http://www.nessus.org/u?af0c704c

Plugin Details

Severity: Low

ID: 333205

File Name: freebsd_pkg_0b58454e8ff311f1b35c4c526214c986.nasl

Version: 1.1

Type: Local

Published: 8/7/2026

Updated: 8/7/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.2

Percentile: 51.15

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

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

CVSS Score Source: CVE-2008-5161

CVSS v3

Risk Factor: Low

Base Score: 3.7

Temporal Score: 3.2

Vector: CVSS:3.0/AV:N/AC:H/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: Low

Base Score: 2.3

Threat Score: 0.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/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: 8/4/2026

Vulnerability Publication Date: 11/14/2008

Reference Information

CVE: CVE-2008-5161