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

Medium Nessus Plugin ID 84015


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 OpenSSL 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.

For the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.


Update the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 84015

File Name: sl_20150604_openssl_on_SL6_x.nasl

Version: $Revision: 2.8 $

Type: local

Agent: unix

Published: 2015/06/08

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: 2015/06/04

Reference Information

CVE: CVE-2015-4000