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.
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Description: 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.
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.
CVSS Base Score: 4.3
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/81902
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:P/I:N/A:N)
Affected Products and Versions
The vulnerability is fixed in the following versions of the IBM GSKit libraries.
- GSKit v8 Common Criteria stream build 22.214.171.124
- GSKit v8 service stream build 126.96.36.199
- GSKit v7 service stream build 188.8.131.52
INSTRUCTIONS FOR OBTAINING GSKIT
Rational Directory Server 5.2.x (Tivoli) customers should upgrade from present version of GSKIT to GSKIT 184.108.40.206. This version of GSKIT has been tested and verified by the Rational Directory Server development labs.
Download GSKIT 220.127.116.11
- Make certain to select a GSKIT Download with a version of GSKIT 18.104.22.168
- Un-install the existing version of GSKIT and install the above mentioned version.
Review the instructions for installing GSKIT for more details.
Workarounds and Mitigations
Get Notified about Future Security Bulletins
* 13 May 2013: Original copy published
*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 Security Bulletin.
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.