Oracle Linux 4 : openssl (ELSA-2006-0695 / ELSA-2006-0661)

This script is Copyright (C) 2013-2016 Tenable Network Security, Inc.

Synopsis :

The remote Oracle Linux host is missing a security update.

Description :

Updated OpenSSL packages are now available to correct several security

This update has been rated as having important security impact by the
Red Hat Security Response Team.

The OpenSSL toolkit provides support for secure communications between
machines. OpenSSL includes a certificate management tool and shared
libraries which provide various cryptographic algorithms and protocols.

These vulnerabilities can affect applications which use OpenSSL to
parse ASN.1 data from untrusted sources, including SSL servers which
enable client authentication and S/MIME applications.

Users are advised to upgrade to these updated packages, which contain
backported patches to correct these issues.

Note: After installing this update, users are advised to either
restart all services that use OpenSSL or restart their system.

From Red Hat Security Advisory 2006:0695 :

Tavis Ormandy and Will Drewry of the Google Security Team discovered a
buffer overflow in the SSL_get_shared_ciphers() utility function. An
attacker could send a list of ciphers to an application that used this
function and overrun a buffer (CVE-2006-3738). Few applications make
use of this vulnerable function and generally it is used only when
applications are compiled for debugging.

Tavis Ormandy and Will Drewry of the Google Security Team discovered a
flaw in the SSLv2 client code. When a client application used OpenSSL
to create an SSLv2 connection to a malicious server, that server could
cause the client to crash. (CVE-2006-4343)

Dr S. N. Henson of the OpenSSL core team and Open Network Security
recently developed an ASN.1 test suite for NISCC (
which uncovered denial of service vulnerabilities :

* Certain public key types can take disproportionate amounts of time
to process, leading to a denial of service. (CVE-2006-2940)

* During parsing of certain invalid ASN.1 structures an error
condition was mishandled. This can result in an infinite loop which
consumed system memory (CVE-2006-2937). This issue does not affect the
OpenSSL version distributed in Red Hat Enterprise Linux 2.1.

From Red Hat Security Advisory 2006:0661 :

Daniel Bleichenbacher recently described an attack on PKCS #1 v1.5
signatures. Where an RSA key with exponent 3 is used it may be
possible for an attacker to forge a PKCS #1 v1.5 signature that would
be incorrectly verified by implementations that do not check for
excess data in the RSA exponentiation result of the signature.

The Google Security Team discovered that OpenSSL is vulnerable to this
attack. This issue affects applications that use OpenSSL to verify
X.509 certificates as well as other uses of PKCS #1 v1.5.

This errata also resolves a problem where a customized ca-bundle.crt
file was overwritten when the openssl package was upgraded.

See also :

Solution :

Update the affected openssl packages.

Risk factor :

Critical / CVSS Base Score : 10.0
CVSS Temporal Score : 8.7
Public Exploit Available : false

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 67405 ()

Bugtraq ID: 19849

CVE ID: CVE-2006-2937

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