Security Bulletin: Vulnerabilities in GSKit fixed in IBM Security/Tivoli Directory Server for AIX/VIOS (CVE-2015-0138, CVE-2015-0159)

Summary

GSKit is an IBM component that is used by IBM Security/Tivoli Directory Server. The GSKit that is shipped with IBM Security/Tivoli Directory Server contains multiple security vulnerabilities including the “FREAK: Factoring Attack on RSA-EXPORT keys" TLS/SSL client and server vulnerability, IBM Security/Tivoli Directory Server has addressed the applicable CVE.

Vulnerability Details

CVEID: CVE-2015-0138

DESCRIPTION: A vulnerability in various IBM SSL/TLS implementations could allow a remote attacker to downgrade the security of certain SSL/TLS connections. An IBM SSL/TLS client implementation could accept the use of an RSA temporary key in a non-export RSA key exchange ciphersuite. This could allow a remote attacker using man-in-the-middle techniques to facilitate brute-force decryption of TLS/SSL traffic between vulnerable clients and servers.
This vulnerability is also known as the FREAK attack.

CVSS Base Score: 4.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/#/vulnerabilities/100691&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVEID: CVE-2015-0159

DESCRIPTION: An unspecified error in GSKit usage of OpenSSL crypto function related to the production of incorrect results on some platforms by Bignum squaring (BN_sqr) has an unknown attack vector and impact in some ECC operations.

CVSS Base Score: 2.6
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/#/vulnerabilities/100835&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:H/Au:N/C:N/I:P/A:N)

Affected Products and Versions

5.3, 6.1, 7.1

VIOS 2.2.x

Remediation/Fixes

The GSKit package contains a fix and needs to be installed on AIX/VIOS systems.

The fixes for the GSKit components can be downloaded at the following link:

Vulnerabilities in GSKit fixed in IBM Security/Tivoli Directory Server (CVE-2015-0138, CVE-2015-0159)

Workarounds and Mitigations

None