Security Bulletin: Vulnerabilities in GSKit fixed in IBM Security/Tivoli Directory Server (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 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 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

• IBM Tivoli Directory Server (ITDS) versions 6.0, 6.1, 6.2, 6.3
• IBM Security Directory Server (ISDS) version 6.3.1

Remediation/Fixes

Affected Product Name and Release

| Fix level|GSKit version
—|—|—
ISDS 6.3.1| 6.3.1.9-ISS-ISDS-IF0009| GSKit 8.0.50.41
ITDS 6.3| 6.3.0.35-ISS-ITDS-IF0035| GSKit 8.0.50.41
ITDS 6.2| 6.2.0.42-ISS-ITDS-IF0042| GSKit 7.0.5.5
ITDS 6.1| 6.1.0.66-ISS-ITDS-IF0066| GSKit 7.0.5.5
ITDS 6.0| 6.0.0.73-ISS-ITDS-IF0073| GSKit 7.0.5.5

Workarounds and Mitigations

None