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

Medium Nessus Plugin ID 84539


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


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.

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.


Update the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 84539

File Name: sl_20150625_nss_on_SL6_x.nasl

Version: $Revision: 2.6 $

Type: local

Agent: unix

Published: 2015/07/06

Modified: 2016/10/19

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 4.3

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


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: 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: 2015/06/25

Reference Information

CVE: CVE-2015-4000