VMware has addressed a critical information disclosure flaw, tracked as CVE-2020-3952, that could be exploited by attackers to compromise vCenter Server or other services that use the Directory Service (vmdir) for authentication.
The CVE-2020-3952 vulnerability has received a CVSSv3 score of 10, it resides in the vCenter Server version 6.7 on Windows and virtual appliances.
According to VMware, the vulnerability could be exploited only on vCenter Server installs that ware upgraded from a previous version. Clean installs of vCenter Server 6.7 (embedded or external PSC) are not impacted.
The vulnerability has been addressed with the release of the 6.7u3f update.
“A sensitive information disclosure vulnerability in the VMware Directory Service (
VMware users can determine if they are affected by searching for vmdir entries in the logs because a log entry is created when the vmdir service starts stating that legacy ACL mode is enabled.
Below an example provided by WMware:
2020-04-06T17:50:41.860526+00:00 info vmdird t@139910871058176: ACL MODE: Legacy
In March, VMware has released security updates to address high severity privilege escalation and denial-of-service (DoS) flaws in the Workstation, Fusion, Remote Console and Horizon Client.
The CVE-2020-3950 is a privilege escalation vulnerability caused by the improper use of setuid binaries, it could be exploited by attackers to escalate privileges to root.
The CVE-2020-3951 vulnerability is a denial-of-service issue caused by a heap-overflow issue in Cortado Thinprint.
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