CentOS 6 / 7 : nss / nss-util (CESA-2015:1185) (Logjam)

Medium Nessus Plugin ID 84405

Synopsis

The remote CentOS host is missing one or more security updates.

Description

Updated nss and nss-util packages that fix one security issue, several bugs and add various enhancements are now available for Red Hat Enterprise Linux 6 and 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications.

A flaw was found in the way the TLS protocol composes the Diffie-Hellman (DH) key exchange. A man-in-the-middle attacker could use this flaw to force the use of weak 512 bit export-grade keys during the key exchange, allowing them do decrypt all traffic.
(CVE-2015-4000)

Note: This update forces the TLS/SSL client implementation in NSS to reject DH key sizes below 768 bits, which prevents sessions to be downgraded to export-grade keys. Future updates may raise this limit to 1024 bits.

The nss and nss-util packages have been upgraded to upstream versions 3.19.1. The upgraded versions provide a number of bug fixes and enhancements over the previous versions.

Users of nss and nss-util are advised to upgrade to these updated packages, which fix these security flaws, bugs, and add these enhancements.

Solution

Update the affected nss and / or nss-util packages.

See Also

http://www.nessus.org/u?4e4eb882

http://www.nessus.org/u?65851da9

http://www.nessus.org/u?1ad1e4f4

http://www.nessus.org/u?a88a2f1d

Plugin Details

Severity: Medium

ID: 84405

File Name: centos_RHSA-2015-1185.nasl

Version: 2.15

Type: local

Agent: unix

Published: 2015/06/26

Updated: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.2

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 3.7

Temporal Score: 3.2

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

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

Vulnerability Information

CPE: p-cpe:/a:centos:centos:nss, p-cpe:/a:centos:centos:nss-devel, p-cpe:/a:centos:centos:nss-pkcs11-devel, p-cpe:/a:centos:centos:nss-sysinit, p-cpe:/a:centos:centos:nss-tools, p-cpe:/a:centos:centos:nss-util, p-cpe:/a:centos:centos:nss-util-devel, cpe:/o:centos:centos:6, cpe:/o:centos:centos:7

Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/06/25

Reference Information

CVE: CVE-2015-2721, CVE-2015-4000

BID: 74733

RHSA: 2015:1185