Security Bulletin
Summary
The RC4 “Bar Mitzvah” Attack for SSL/TLS affects IBM Tivoli/Security Directory Server.
Vulnerability Details
CVEID: CVE-2015-2808
DESCRIPTION: The RC4 algorithm, as used in the TLS protocol and SSL protocol, could allow a remote attacker to obtain sensitive information. An attacker could exploit this vulnerability to remotely expose account credentials without requiring an active man-in-the-middle session. Successful exploitation could allow an attacker to obtain sensitive information. This vulnerability is commonly referred to as "Bar Mitzvah Attack".
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/101851 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
Affected Products and Versions
- IBM Tivoli Directory Server 6.0, 6.1, 6.2, 6.3
- IBM Security Directory Server 6.3.1, 6.4
Remediation/Fixes
|
Affected Releases | Fixes Available |
| IBM Tivoli Directory Server 6.0 | 6.0.0.73-ISS-ITDS-IF0074 |
| IBM Tivoli Directory Server 6.1 | 6.1.0.67-ISS-ITDS-IF0067 |
| IBM Tivoli Directory Server 6.2 | 6.2.0.43-ISS-ITDS-IF0043 |
| IBM Tivoli Directory Server 6.3 | 6.3.0.36-ISS-ITDS-IF0036 |
| IBM Security Directory Server 6.3.1 | 6.3.1.10-ISS-ISDS-IF0010 |
| IBM Security Directory Server 6.4 | 6.4.0.1-ISS-ISDS-IF0001 |
Workarounds and Mitigations
For each instance of the server, remove the following lines from the server configuration file at /home/<instance name>/<instance name>-idsldap/etc/ibmslapd.conf, and restart the server.
[under dn: cn=SSL,cn=Configuration]
ibm-slapdSslCipherSpec: RC4-128-MD5
ibm-slapdSslCipherSpec: RC4-128-SHA
ibm-slapdSslCipherSpec: DES-56
ibm-slapdSslCipherSpec: RC4-40-MD5
ibm-slapdSslCipherSpec: RC2-40-MD5
You should verify applying this configuration change does not cause any compatibility issues. Not disabling the RC4 stream cipher will expose yourself to the attack described above. IBM recommends that you review your entire environment to identify other areas where you have enabled the RC4 stream cipher and take appropriate mitigation and remediation actions.
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References
Change History
May 7, 2015: Added Fixes for Directory Server
April 27, 2015: Original Version 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.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
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Document Information
Modified date:
16 June 2018
UID
swg21883604