FreeBSD : OpenSSL -- Client DoS due to large DH parameter (c82ecac5-6e3f-11e8-8777-b499baebfeaf)

Medium Nessus Plugin ID 110504

Synopsis

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

Description

The OpenSSL project reports :

During key agreement in a TLS handshake using a DH(E) based
ciphersuite a malicious server can send a very large prime value to
the client. This will cause the client to spend an unreasonably long
period of time generating a key for this prime resulting in a hang
until the client has finished. This could be exploited in a Denial Of
Service attack.

Solution

Update the affected packages.

See Also

https://www.openssl.org/news/secadv/20180612.txt

http://www.nessus.org/u?1630b29b

Plugin Details

Severity: Medium

ID: 110504

File Name: freebsd_pkg_c82ecac56e3f11e88777b499baebfeaf.nasl

Version: 1.6

Type: local

Published: 2018/06/13

Modified: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

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

CVSS v3.0

Base Score: 7.5

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:libressl, p-cpe:/a:freebsd:freebsd:libressl-devel, p-cpe:/a:freebsd:freebsd:openssl, p-cpe:/a:freebsd:freebsd:openssl-devel, cpe:/o:freebsd:freebsd

Patch Publication Date: 2018/06/12

Vulnerability Publication Date: 2018/06/12

Reference Information

CVE: CVE-2018-0732