CVE-2021-3956: Medium severity lenovo xclarity controller vulnerability
A read-only authentication bypass vulnerability was reported in the Third Quarter 2021 release of Lenovo XClarity Controller (XCC) firmware affecting XCC devices configured in LDAP Authentication Only Mode and using an LDAP server that supports “unauthenticated bind”, such as Microsoft Active Directory. An unauthenticated user can gain read-only access to XCC in such a configuration, thereby allowing the XCC device configuration to be viewed but not changed. XCC devices configured to use local authentication, LDAP Authentication + Authorization Mode, or LDAP servers that support only “authenticated bind” and/or “anonymous bind” are not affected.
Affected Software
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Event History
Frequently Asked Questions
What is CVE-2021-3956?
CVE-2021-3956 is a read-only authentication bypass vulnerability in Lenovo XClarity Controller (XCC) firmware.
Which devices are affected by CVE-2021-3956?
The Third Quarter 2021 release of Lenovo XClarity Controller (XCC) firmware is affected by CVE-2021-3956.
What is the severity level of CVE-2021-3956?
CVE-2021-3956 has a severity level of 5.3 (medium).
How does CVE-2021-3956 affect LDAP Authentication Only Mode?
CVE-2021-3956 affects XCC devices configured in LDAP Authentication Only Mode and using an LDAP server that supports 'unauthenticated bind', such as Microsoft Active Directory.
How can I fix CVE-2021-3956?
To fix CVE-2021-3956, Lenovo has released a firmware update. Please refer to the official Lenovo security advisory for more information.