Verifying if VA scan's vulnerabilities are false positives

sunhux
sunhux used Ask the Experts™
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We run our McAfee Vulnerability Mgr scan against a Windows 2012 R2 & the report
indicated it's a Win 2016 (which I don't know why the wrong OS is given) & it gives 3
vulnerabilities below (which my Wintel colleague says are not applicable for Win2012
R2) which I'm trying to verify if they are false positives.

Without installing any tool on the server, how can I verify if they're false +ves :

1) SSLv3 Information Disclosure Vulnerability [FID 17281]
2) TLS/SSL RC4 Cipher Suites Information Disclosure Vulnerability [FID 18179]
3) SSL/TLS Protocol Triple-DES Information Disclosure Vulnerability [FID 20465]

I have openssl client on my laptop but I can run it against that server as the
firewall blocks tcp443 from my laptop to that server :
   openssl s_client -connect  that_server_IP:443

I'm not allowed to install any tool as well on other servers in the same subnet
as that server as well;  so is there any native (ie built-in) ways to check ?
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Distinguished Expert 2018
Commented:
One thing you could do is have your Wintel person verify what versions of SSL and TLS are enabled on the servers in question. We're basically at a point where enough bugs have been shown in the protocols (this has no tie to a given OS) that older secure protocols should be getting disabled. Ideally you want to have everything only using TLS 1.2, but if you have to keep anything older enabled for some reason, then it should be documented (along with having a process for someone signing off on accepting the risk). And obviously, you don't want to be using RC4 ciphers.

Chances are these are true positives, and the admin just doesn't want to have to fix it for whatever reason.

Can you connect to any of these servers? You possibly do tests that way with a browser (which follows the rules because you didn't add tools!) Otherwise, you can load on a workstation a tool like MS Baseline Analyzer (you can do remote scans) or OpenVAS. Nmap would also help you out here: https://danielmiessler.com/blog/check-logjam-nmap/#gs.dzgSAn4
btanExec Consultant
Distinguished Expert 2018
Commented:
Check the policy setting;
 Computer Configuration > Administrative Templates > Network > SSL Configuration Settings
Or from registry from OS level;
HKey_Local_Machine\System\CurrentControlSet\Control\SecurityProviders \SCHANNEL\Protocols
https://support.microsoft.com/en-za/help/187498/how-to-disable-pct-1.0,-ssl-2.0,-ssl-3.0,-or-tls-1.0-in-internet-information-services
Rajul RajInformation Security Officer

Commented:
Use Nexpose for performing VA .

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