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FreeBSD : OpenSSL -- ChaCha20-Poly1305 nonce vulnerability (e56f2f7c-410e-11e9-b95c-b499baebfeaf)

high Nessus Plugin ID 122686

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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

The OpenSSL project reports :

Low: ChaCha20-Poly1305 with long nonces (CVE-2019-1543)

ChaCha20-Poly1305 is an AEAD cipher, and requires a unique nonce input for every encryption operation. RFC 7539 specifies that the nonce value (IV) should be 96 bits (12 bytes). OpenSSL allows a variable nonce length and front pads the nonce with 0 bytes if it is less than 12 bytes. However it also incorrectly allows a nonce to be set of up to 16 bytes. In this case only the last 12 bytes are significant and any additional leading bytes are ignored.

Solution

Update the affected package.

See Also

https://www.openssl.org/news/secadv/20190306.txt

http://www.nessus.org/u?b8c42b05

Plugin Details

Severity: High

ID: 122686

File Name: freebsd_pkg_e56f2f7c410e11e9b95cb499baebfeaf.nasl

Version: 1.3

Type: local

Published: 3/8/2019

Updated: 2/5/2020

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

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 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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:openssl111, 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: 3/7/2019

Vulnerability Publication Date: 3/6/2019

Reference Information

CVE: CVE-2019-1543