Scientific Linux Security Update : openssl on SL6.x, SL7.x i386/x86_64 (20150604) (Logjam)

low Nessus Plugin ID 84015
New! Plugin Severity Now Using CVSS v3

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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 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.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?6d6b5f68

Plugin Details

Severity: Low

ID: 84015

File Name: sl_20150604_openssl_on_SL6_x.nasl

Version: 2.11

Type: local

Agent: unix

Published: 6/8/2015

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:openssl, p-cpe:/a:fermilab:scientific_linux:openssl-debuginfo, p-cpe:/a:fermilab:scientific_linux:openssl-devel, p-cpe:/a:fermilab:scientific_linux:openssl-libs, p-cpe:/a:fermilab:scientific_linux:openssl-perl, p-cpe:/a:fermilab:scientific_linux:openssl-static, 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: 6/4/2015

Vulnerability Publication Date: 5/21/2015

Reference Information

CVE: CVE-2015-4000