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

low Nessus Plugin ID 84539

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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: 2.10

Type: local

Agent: unix

Published: 7/6/2015

Updated: 12/5/2022

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.5

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Vector: CVSS2#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-util-debuginfo, p-cpe:/a:fermilab:scientific_linux:nss-util-devel, x-cpe:/o:fermilab:scientific_linux, p-cpe:/a:fermilab:scientific_linux:nss-util, p-cpe:/a:fermilab:scientific_linux:nss-devel, p-cpe:/a:fermilab:scientific_linux:nss-sysinit, p-cpe:/a:fermilab:scientific_linux:nss, p-cpe:/a:fermilab:scientific_linux:nss-debuginfo, p-cpe:/a:fermilab:scientific_linux:nss-pkcs11-devel, p-cpe:/a:fermilab:scientific_linux:nss-tools

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