CVE-2020-3952: Sensitive Information Disclosure in VMware vCenter Server (VMSA-2020-0006)
VMware patches a critical information disclosure flaw in vCenter Server with a CVSSv3 score of 10.0.
Contexte
On April 9, VMware published VMSA-2020-0006, a security advisory for a critical vulnerability in vCenter Server that received the maximum CVSSv3 score of 10.0.
Analyse
CVE-2020-3952 is a sensitive information disclosure flaw in VMware vCenter Server. The flaw resides in the VMware Directory Service (vmdir), which is included in vCenter Server as part of an embedded or external Platform Services Controller (PSC). Under “certain conditions,” vmdir does not implement proper access controls, which could allow a malicious attacker with network access to obtain sensitive information. While the advisory does not indicate what sensitive information could be obtained, VMware notes this information could be used to compromise vCenter Server or other services that use vmdir for authentication.
Démonstration de faisabilité (PoC)
At the time of this writing, no public PoC has been released for this vulnerability. Based on the CVSSv3 score of 10.0 assigned to this vulnerability, it is likely that it may be easy to exploit.
Solution
VMware released vCenter Server version 6.7u3f to address this vulnerability. The following table lists the affected versions of vCenter Server.
| Produit | Version | Plateforme | Affected | Fixed | Additional Documentation |
|---|---|---|---|---|---|
| vCenter Server | 6.7 | Appliance virtuelle | Oui | 6.7u3f | KB78543 |
| vCenter Server | 6.7 | Windows | Oui | 6.7u3f | KB78543 |
According to VMware’s advisory, the vulnerability only affects specific versions of vCenter Server versions 6.7. Specifically, those instances where vCenter Server was upgraded from a previous version, including version 6.0 or 6.5. A new and clean installation of vCenter Server 6.7 is not affected.
VMware has published KB article 78543 with additional guidance to determine if a vCenter Server 6.7 deployment is affected.
Identification des systèmes affectés
A list of Tenable plugins to identify this vulnerability will appear here as they’re released.
Où trouver plus d'informations
- VMware VMSA-2020-0006 Security Advisory
- VMware KB 78543: Additional Documentation for VMSA-2020-0006
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Scott Caveza
Senior Staff Research Engineer, Security Response
Scott joined Tenable in 2012 as a Research Engineer on the Nessus Plugins team. Over the years, he has written hundreds of plugins for Nessus, and reviewed code for even more from his time being a team lead and manager of the Plugins team. Previously leading the Security Response team and the Zero Day Research team, Scott is currently a member of the Security Response team, helping the research organization respond to the latest threats. He has over a decade of experience in the industry with previous work in the Security Operations Center (SOC) for a major domain registrar and web hosting provider. Scott is a current CISSP and actively maintains his GIAC GWAPT Web Application Penetration Tester certification.
Interests outside of work: Scott enjoys spending time with his family, camping, fishing and being outdoors. He also enjoys finding ways to break web applications and home renovation projects.
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