Authentication bypass in VMware vCenter Server

1) Authentication bypass

EUVDB-ID: #VU7642

Risk: Low

CVSSv3.1: 7.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:W/RC:C]

CVE-ID: CVE-2017-4919

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to bypass authentication on the target system.

The weakness exists due to improper security restrictions. A remote attacker acting as a vSphere user can use the VIX API to bypass additional authentication restrictions and gain access to a Guest Operating System (GuestOS).

Mitigation

As a temporary solution the vendor has suggested the following workaround:

https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&...

Vulnerable software versions

vCenter Server: 5.5U1 - 6.5.0

External links

http://www.vmware.com/security/advisories/VMSA-2017-0012.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.