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HistoryJun 16, 2018 - 9:23 p.m.

Security Bulletin: Vulnerability in RC4 stream cipher affects IBM Tivoli/Security Directory Server (CVE-2015-2808)

2018-06-1621:23:58
www.ibm.com
2

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

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.

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

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