Scientific Linux Security Update : openssl on SL5.x i386/x86_64 (Logjam)

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

An out-of-bounds read flaw was found in the X509_cmp_time() function
of OpenSSL. A specially crafted X.509 certificate or a Certificate
Revocation List (CRL) could possibly cause a TLS/SSL server or client
using OpenSSL to crash. (CVE-2015-1789)

A NULL pointer dereference was found in the way OpenSSL handled
certain PKCS#7 inputs. A specially crafted PKCS#7 input with missing
EncryptedContent data could cause an application using OpenSSL to
crash. (CVE-2015-1790)

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 to 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.

See also :

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 84542 ()

Bugtraq ID:

CVE ID: CVE-2015-1789

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