Security Bulletin: IBM Tivoli Directory Server can be affected by a vulnerability in the IBM GSKit library (CVE-2013-0169)

Abstract

The Transport Layer Security protocol does not properly consider timing side-channel attacks, which allows remote attackers to conduct distinguishing attacks and plain-text recovery attacks via statistical analysis of timing data for crafted packets, aka the “Lucky Thirteen” issue.

Content

VULNERABILITY DETAILS:

CVE-2013-0169

DESCRIPTION:

A weakness in the handling of cipher-block chaining (CBC) ciphersuites in Secure Sockets Layer (SSL), Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) could lead to plaintext recovery of sensitive information by exploiting timing differences arising during message authentication codes (MAC) processing. The CVSS score is based on IBM X-Force rankings, which sets the access complexity for this vulnerability as Medium.

The attack does not require local network access nor does it require authentication, but some degree of specialized knowledge and techniques are required. An exploit may impact the confidentiality of information but the integrity of data, or the availability of the system would not be compromised.

CVEID:
CVE-2013-0169

CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/81902
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)

AFFECTED PRODUCTS AND VERSIONS:
PRODUCT VERSIONS AFFECTED

REMEDIATION:
The vulnerability is fixed in the following versions of the IBM GSKit libraries.

• GSKit v8 Common Criteria stream build 8.0.14.27
• GSKit v8 service stream build 8.0.50.4
• GSKit v7 service stream build 7.0.4.45

Tivoli Directory Server fixes for entitled customers on Fix Central provide access to the latest GSKit build available as of their publication.

For access to GSKit 8.0.14.27:

• Upgrade to Tivoli Directory Server 6.3.0.22

For access to GSKit 7.0.4.45:

• Upgrade to Tivoli Directory Server 6.2.0.30
• Upgrade to Tivoli Directory Server 6.1.0.55
• Upgrade to Tivoli Directory Server 6.0.0.72

Workaround(s):
None

Mitigation(s):
None

REFERENCES:

• Complete CVSS Guide
• On-line Calculator V2
• CVE-2013-0169
• https://exchange.xforce.ibmcloud.com/vulnerabilities/81902
• IBM Security Alerts
• Upgrade to Tivoli Directory Server 6.3.0.22
• Upgrade to Tivoli Directory Server 6.2.0.30
• Upgrade to Tivoli Directory Server 6.1.0.55
• Upgrade to Tivoli Directory Server 6.0.0.72

RELATED INFORMATION:
_IBM Secure Engineering Web Portal _

ACKNOWLEDGEMENT
None

_*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Flash. _

_Note: _According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an “industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response.” IBM PROVIDES THE CVSS SCORES “AS IS” WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

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