IBM Tivoli Directory Server (TDS) enables NULL-MD5 and NULL-SHA ciphers in the default Transport Layer Security (TLS) configuration. Use of either of these ciphers would result in unencrypted communications.
CVE ID: CVE-2012-0726
DESCRIPTION: In the default TDS environment with TLS enabled, the NULL-MD5 and NULL-SHA ciphers are enabled by default. If a client failed to negotiate a stronger cipher for the TLS session, it could default to using a either a NULL-MD5 and NULL-SHA cipher. This would result in unencrypted would leave communications effectively unencrypted.
CVSS Base Score: 6.4
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/74303 for the current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:P/I:P/A:N)
AFFECTED PLATFORMS: Version 6.3 and earlier
For TDS versions not listed here contact IBM Technical Support
If assistance is required to determine the version, release of TDS installed, see the following url for information
Enable Federal Information Processing Standards (FIPS) mode in ibmslapd ssl configuration to turn disable NULL ciphers.
1) Put the following text into cfgFIPS.ldif
2) ldapmodify -p <port> -D cn=root -w <pwd> -i cfgFIPS.ldif
Then restart both ibmdiradm and ibmslapd processes.
· Complete CVSS Guide
· On-line Calculator V2
· X-Force Database
· IBM Product Security Incident Response Program
· IBM Tivoli Directory Server Support
|Created/Revised by||Date of Creation/Update||Summary of Changes|
|brookh||2012/04/17||Corrected CVSS and added disclaimer|
*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 Flash.
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