Scientific Linux Security Update : nss on SL6.x, SL7.x i386/x86_64 (20150625) (Logjam)

low Nessus Plugin ID 84539
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

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.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?c5985bc5

Plugin Details

Severity: Low

ID: 84539

File Name: sl_20150625_nss_on_SL6_x.nasl

Version: 2.9

Type: local

Agent: unix

Published: 7/6/2015

Updated: 1/14/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.9

CVSS v2

Risk Factor: Medium

Base Score: 4.3

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

CVSS v3

Risk Factor: Low

Base Score: 3.7

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

Vulnerability Information

CPE: p-cpe:/a:fermilab:scientific_linux:nss, p-cpe:/a:fermilab:scientific_linux:nss-debuginfo, p-cpe:/a:fermilab:scientific_linux:nss-devel, p-cpe:/a:fermilab:scientific_linux:nss-pkcs11-devel, p-cpe:/a:fermilab:scientific_linux:nss-sysinit, p-cpe:/a:fermilab:scientific_linux:nss-tools, p-cpe:/a:fermilab:scientific_linux:nss-util, p-cpe:/a:fermilab:scientific_linux:nss-util-debuginfo, p-cpe:/a:fermilab:scientific_linux:nss-util-devel, x-cpe:/o:fermilab:scientific_linux

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

Patch Publication Date: 6/25/2015

Vulnerability Publication Date: 5/21/2015

Reference Information

CVE: CVE-2015-4000