After the POODLE unpleasantness, both Google and Chrome secured their latest browser versions (Firefox 35, Chrome 40) by barring the use of the SSL 3.0 encryption protocol entirely, since POODLE utilizes this protocol as an attack vector. (Microsoft has released various patches and quick-fixes for Internet Explorer 11 and states they’ll completely disable SSL 3.0 in April 2015.)
Disabling SSL 3.0is definitely a Good Thing. However, the subsequent revelation that TLS 1.0 is also vulnerable seems to have caught them on the off foot. In this article, we will show you how to protect yourself by forcing your browser to use only the safer TLS 1.1 and TLS 1.2 protocols.
NOTE: POODLE and similar exploits work when both the server and browser ends of a supposedly safe connection can be tricked into using an obsolete protocol. If you have secured your browser to only use TLS 1.1/1.2 but the website’s server still relies on older, insecure protocols, be aware that you may have issues connecting to that site.
How to Turn Off SSL 3.0 and TLS 1.0 in Internet Explorer
Left-click the gear icon:
Select “Internet options” from the dropdown menu:
Click the “Advanced” tab, scroll downand deselect “SSL 3.0” and “TLS 1.0”.
Click “OK” to accept your changes, which should take effect immediately. (You may need to refresh your browser.)
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How to Turn Off SSL 3.0 and TLS 1.0 in Firefox
In the address bar, type “about:config” and hit enter.
In the “Search” field, enter “tls”. Find and double-click the entry for “security.tls.version.min”.
Set the integer value to “2” to force a minimum protocol of TLS 1.1 (entering “3” would force TLS 1.2).
This configuration will now show the new value and will take effect immediately (don’t forget to clear your cache).
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How to Turn Off SSL 3.0 and TLS 1.0 in Google Chrome
Science marches on! A massive tip of the hat (or tip of the massive hat) to commentator John Giles for pointing outthat using chrome://flags/is the latest and easiest way to set the minimum protocol version in Chrome. We must note that Google hangs a red warning over using flags – however, our testing has yielded positive results.John says:
For Chrome, how about this?:
chrome://flags
Under “Minimum SSL/TLS version supported.”, change from “Default” to “TLS 1.1?.
Then press the “Relaunch Now” button at the bottom of the page.
Thanks again, John!
Unlike IE and Firefox, Chrome can only be made to use TLS 1.1/1.2 by a command-line switch – an argument added to the string that fires up the browser. This can be implemented bysetting up a shortcut as we will show you below, but note that ONLY starting Chrome from this shortcut will prevent use of insecure protocols.
To create a secure shortcut:
Right-click on your desktop and select “New”, then “Shortcut”.
In the “Create Shortcut” panel, browse to the location of your Chrome installation and select the Chrome icon – the default location is:
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In the navigation tree, under SSL 3.0, select Server and then, in the right pane, double-click the Enabled DWORD value. In the Edit DWORD (32-bit) Value window, in the Value Data box leave the value at 0 and then, click OK. Restart your Windows server. You have successfully disabled the SSL v3 protocol.
Go to SSL/TLS > Edge Certificates.For Disable Universal SSL, select Disable Universal SSL.Read the warnings in the Acknowledgement.Select I Understand and select Confirm.
To disable TLS 1.3, open Chrome then types chrome://flags/#tls13-variant on the address bar. Locate TLS 1.3 then open the drop-down menu next to it. Disable it by setting it as 'Disabled.
Open registry on your server by running regedit in the run window. Navigate to the below location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols . Now change DWORD values under Server and Client under TLS 1.0: DisabledByDefault [Value = 0] and Enabled [Value = 0] .
Create a key named "TLS 1.1" with two DWORDs for both TLS 1.0 & 1.1: "DisabledByDefault=1" & "Enabled=0". Similarly, create a key named "TLS 1.0" with two DWORDs for each protocol, "DisabledByDefault=1" & "Enabled=0".
Open the Tools menu (click on the tools icon or type Alt - x) and select Internet options. Select the Advanced tab. Scroll down to the bottom of the Settings section. If TLS is not enabled, select the checkboxes next to Use TLS 1.0, Use TLS 1.1, and Use TLS 1.2.
To open Internet Options, type Internet Options in the search box on the taskbar. You can also select Change settings from the dialog shown in Figure 1. On the Advanced tab, scroll down in the Settings panel.There you can enable or disable TLS protocols.
The default value of minimum SSL/TLS version can be changed by adding Chrome's command line switch/flag (--ssl-version-fallback-min=tls1) to Chrome's Windows shortcut.
To remove the certificate from the browser, follow these steps:
Open Google Chrome, click the Customize and control Google Chrome icon (the three vertical dots ) > go to Settings > at the left margin, click Privacy and security > click Security.
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