A vulnerability in LDAP authentication affects IBM SAN Volume Controller, IBM Storwize V7000, IBM Storwize V5000 and V5100, IBM Storwize V5000E, IBM Spectrum Virtualize Software, IBM Spectrum Virtualize for Public Cloud, IBM FlashSystem V9000, IBM FlashSystem 9100 Family, IBM FlashSystem 9200, IBM FlashSystem 7200 and IBM FlashSystem 5000 products. The applicable vulnerability is CVE-2020-4686.
DESCRIPTION: IBM Spectrum Virtualize could allow a remote user authenticated via LDAP to escalate their privileges and perform actions they should not have access to.
CVSS Base score: 6.8
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/186678 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N)
Affected Products and Versions
|SAN Volume Controller and Storwize Family||8.3.1|
IBM recommends that you fix this vulnerability by upgrading affected versions of IBM SAN Volume Controller, IBM Storwize V7000, IBM Storwize V5000 and V5100, IBM Storwize V5000E, IBM Spectrum Virtualize Software, IBM Spectrum Virtualize for Public Cloud, IBM FlashSystem V9000, IBM FlashSystem 9100 Family, IBM FlashSystem 9200, IBM FlashSystem 7200 and IBM FlashSystem 5000 to the following code levels or higher:
Latest IBM SAN Volume Controller Code
Latest IBM Storwize V7000 Code
Latest IBM Storwize V5000 and V5100 Code
Latest IBM Storwize V5000E Code
Latest IBM FlashSystem V9000 Code
Latest IBM FlashSystem 9100 Family Code
Latest IBM FlashSystem 9200 Code
Latest IBM FlashSystem 7200 Code
Latest IBM FlashSystem 5000 Code
Latest IBM Spectrum Virtualize Software
Latest IBM Spectrum Virtualize for Public Cloud
Workarounds and Mitigations
Disabling the LDAP authentication cache will prevent this vulnerability from being exploited. The LDAP authentication cache can be disabled by setting the authentication cache minutes to 0 by running the following command on the CLI:
chldap -authcacheminutes 0
This setting can only be changed via the CLI by a user with the SecurityAdmin role.
Disabling the authentication cache will cause all logins and any CLI commands that modify the system configuration to authenticate individually with the LDAP server, causing an increase in load on the LDAP servers which may lead to command line processing delays. CLI commands that view the state of the system are not affected.
For this reason we recommend reenabling the authentication cache after upgrading to a code level containing a fix for this vulnerability, which can be done by running the following command on the CLI:
chldap -authcacheminutes 10
This will set the authentication cache time back to the default value of 10 minutes.
Get Notified about Future Security Bulletins
14 Aug 2020: Initial Publication
17 Aug 2020: Updated product list and clarified affected version
*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.
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.
17 August 2020