Security Bulletin
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
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References
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
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
swg22000370