Multiple vulnerabilities were discovered in OpenSSL, a Secure Sockets Layer toolkit.

CVE-2014-8176

Praveen Kariyanahalli, Ivan Fratric and Felix Groebert discovered that an invalid memory free could be triggered when buffering DTLS data.
This could allow remote attackers to cause a denial of service (crash) or potentially execute arbitrary code. This issue only affected the oldstable distribution (wheezy).

CVE-2015-1789

Robert Swiecki and Hanno B??ck discovered that the X509_cmp_time function could read a few bytes out of bounds. This could allow remote attackers to cause a denial of service (crash) via crafted certificates and CRLs.

CVE-2015-1790

Michal Zalewski discovered that the PKCS#7 parsing code did not properly handle missing content which could lead to a NULL pointer dereference. This could allow remote attackers to cause a denial of service (crash) via crafted ASN.1-encoded PKCS#7 blobs.

CVE-2015-1791

Emilia K??sper discovered that a race condition could occur due to incorrect handling of NewSessionTicket in a multi-threaded client, leading to a double free. This could allow remote attackers to cause a denial of service (crash).

CVE-2015-1792

Johannes Bauer discovered that the CMS code could enter an infinite loop when verifying a signedData message, if presented with an unknown hash function OID. This could allow remote attackers to cause a denial of service.

Additionally OpenSSL will now reject handshakes using DH parameters shorter than 768 bits as a countermeasure against the Logjam attack (CVE-2015-4000).

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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.
(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.

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.

The remote Oracle Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2015-1197 advisory.

    - fix CVE-2014-3570 - Bignum squaring may produce incorrect results
    - fix CVE-2014-3571 - DTLS segmentation fault in dtls1_get_record
    - fix CVE-2014-3572 - ECDHE silently downgrades to ECDH [Client]
    - fix CVE-2015-1789 - out-of-bounds read in X509_cmp_time
    - fix CVE-2015-1790 - PKCS7 crash with missing EncryptedContent

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

OpenSSL was updated to fix several security issues.

CVE-2015-4000: The Logjam Attack ( weakdh.org ) has been addressed by rejecting connections with DH parameters shorter than 1024 bits. We now also generate 2048-bit DH parameters by default.

CVE-2015-1789: An out-of-bounds read in X509_cmp_time was fixed.

CVE-2015-1790: A PKCS7 decoder crash with missing EnvelopedContent was fixed.

fixed a timing side channel in RSA decryption (bnc#929678)

Additional changes :

In the default SSL cipher string EXPORT ciphers are now disabled. This will only get active if applications get rebuilt and actually use this string. (bnc#931698)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

OpenSSL was updated to fix several security issues.

CVE-2015-4000: The Logjam Attack ( weakdh.org ) has been addressed by rejecting connections with DH parameters shorter than 1024 bits. We now also generate 2048-bit DH parameters by default.

CVE-2015-1788: Malformed ECParameters could cause an infinite loop.

CVE-2015-1789: An out-of-bounds read in X509_cmp_time was fixed.

CVE-2015-1790: A PKCS7 decoder crash with missing EnvelopedContent was fixed.

fixed a timing side channel in RSA decryption (bnc#929678)

Additional changes :

In the default SSL cipher string EXPORT ciphers are now disabled. This will only get active if applications get rebuilt and actually use this string. (bnc#931698)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Published	Updated	Severity
84253	Debian DLA-247-1 : openssl security update (Logjam)	Nessus	Debian Local Security Checks	6/18/2015	12/5/2022	high
84467	RHEL 5 : openssl (RHSA-2015:1197) (Logjam)	Nessus	Red Hat Local Security Checks	6/30/2015	12/5/2022	high
84485	Oracle Linux 5 : openssl (ELSA-2015-1197)	Nessus	Oracle Linux Local Security Checks	7/1/2015	4/29/2025	low
84506	CentOS 5 : openssl (CESA-2015:1197) (Logjam)	Nessus	CentOS Local Security Checks	7/6/2015	12/5/2022	high
84560	SUSE SLED11 / SLES10 Security Update : OpenSSL (SUSE-SU-2015:1183-2) (Logjam)	Nessus	SuSE Local Security Checks	7/7/2015	12/5/2022	high
84558	SUSE SLES10 Security Update : OpenSSL (SUSE-SU-2015:1181-2) (Logjam)	Nessus	SuSE Local Security Checks	7/7/2015	12/5/2022	high

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