ESB-2017.2531 - [Win][Linux][HP-UX][Solaris][AIX] IBM Security Directory Server: Access privileged data - Remote/unauthenticated 2017-10-09

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.2531
    Security Bulletin: A vulnerability has been addressed in the GSKit
        component of IBM Security Directory Server (CVE-2016-2183)
                              9 October 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           IBM Security Directory Server
Publisher:         IBM
Operating System:  AIX
                   HP-UX
                   Linux variants
                   Solaris
                   Windows
Impact/Access:     Access Privileged Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-2183  

Reference:         ASB-2017.0102
                   ASB-2016.0095
                   ESB-2017.2512
                   ESB-2017.2469
                   ESB-2017.2326
                   ESB-2017.2318
                   ESB-2017.2265

Original Bulletin: 
   http://www.ibm.com/support/docview.wss?uid=swg22000370

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Security Bulletin: A vulnerability has been addressed in the GSKit component
of IBM Security Directory Server (CVE-2016-2183)

Security Bulletin

Document information

More support for:

IBM Security Directory Server

SSL

Software version:

6.2, 6.3, 6.3.1, 6.4, 8.0, 8.0.1

Operating system(s):

AIX, HP-UX, Linux, Solaris, Windows

Software edition:

All Editions

Reference #:

2000370

Modified date:

06 October 2017

Summary

IBM GSKit could allow a remote attacker to obtain sensitive information,
caused by an error in the DES/3DES cipher, used as a part of the SSL/TLS
protocol. This vulnerability is known as the SWEET32 Birthday attack.

Vulnerability Details

CVEID: CVE-2016-2183
DESCRIPTION: OpenSSL could allow a remote attacker to obtain sensitive
information, caused by an error in the DES/3DES cipher, used as a part of the
SSL/TLS protocol. By capturing large amounts of encrypted traffic between the
SSL/TLS server and the client, a remote attacker able to conduct a man-in-
the-middle attack could exploit this vulnerability to recover the plaintext
data and obtain sensitive information. This vulnerability is known as the
SWEET32 Birthday attack.
CVSS Base Score: 3.7
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/116337
for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)

Affected Products and Versions

IBM Tivoli Directory Server 6.2 and 6.3
IBM Security Directory Server 6.3.1 and 6.4
IBM Security Directory Suite 8.0 and 8.0.1

Remediation/Fixes

Product                              APAR     V.R.M.F   Remediation

IBM Tivoli Directory Server 6.2      IO24996  6.2.0.52  6.2.0.52-ISS-ITDS-IF0052
IBM Tivoli Directory Server 6.3      IO24997  6.3.0.45  6.3.0.45-ISS-ITDS-IF0045
IBM Security Directory Server 6.3.1  IO25027  6.3.1.20  6.3.1.20-ISS-ISDS-IF0020
IBM Security Directory Server 6.4    IO24983  6.4.0.11  6.4.0.11-ISS-ISDS-IF0011
IBM Security Directory Suite 8.0                        Contact IBM Support
IBM Security Directory Suite 8.0.1   IO25028  8.0.1.1   8.0.1.1-ISS-ISDS_20170301-2234


Workarounds and Mitigations

Use either of the following methods to disallow DES/3DES ciphers on the
directory server

A) Enable FIPS mode, or

B) Remove the following ciphers from the server configuration, ibmslapd.conf:

ibm-slapdSslCipherSpec: RC4-40-MD5
ibm-slapdSslCipherSpec: RC4-128-MD5
ibm-slapdSslCipherSpec: RC4-128-SHA
ibm-slapdSslCipherSpec: RC2-40-MD5
ibm-slapdSslCipherSpec: DES-56
ibm-slapdSslCipherSpec: TripleDES-168

and set the client ciphers using the environment variable:

export LDAP_OPT_SSL_CIPHER=352F

References

Complete CVSS v3 Guide
On-line Calculator v3

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Change History

15 Mar 2017 : Original draft
17 Mar 2017: Contact support for SDS 8.0 remediation

*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

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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