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FreeBSD : py-cryptography -- vulnerable HKDF key generation (e5dcb942-ba6f-11e6-b1cf-14dae9d210b8)

high Nessus Plugin ID 95515

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

Alex Gaynor reports :

Fixed a bug where ``HKDF`` would return an empty byte-string if used with a ``length`` less than ``algorithm.digest_size``.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?36c7f8c3

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214915

http://www.nessus.org/u?1b05d3f3

Plugin Details

Severity: High

ID: 95515

File Name: freebsd_pkg_e5dcb942ba6f11e6b1cf14dae9d210b8.nasl

Version: 3.7

Type: local

Published: 12/5/2016

Updated: 1/15/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2016-9243

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:py34-cryptography, cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:py33-cryptography, p-cpe:/a:freebsd:freebsd:py27-cryptography, p-cpe:/a:freebsd:freebsd:py35-cryptography

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

Exploit Ease: No known exploits are available

Patch Publication Date: 12/4/2016

Vulnerability Publication Date: 11/5/2016

Reference Information

CVE: CVE-2016-9243