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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== 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 =========================================================================== 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 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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