RHEL 5 : openssl (RHSA-2015:1197) (Logjam)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.

Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated openssl packages that fix three security issues are now
available for Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL
v2/v3) and Transport Layer Security (TLS v1) protocols, as well as a
full-strength, general purpose cryptography library.

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.

Red Hat would like to thank the OpenSSL project for reporting
CVE-2015-1789 and CVE-2015-1790. Upstream acknowledges Robert Swiecki
and Hanno Bock as the original reporters of CVE-2015-1789, and Michal
Zalewski as the original reporter of CVE-2015-1790.

All openssl users are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. 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
CVSS Temporal Score : 3.9
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 84467 ()

Bugtraq ID:

CVE ID: CVE-2015-1789

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