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9.3

Disable support for LOW encryption ciphers.

Asked by davidvilson in Microsoft IIS Web Server, Secure Socket Layer (SSL) & HTTPS

Tags: IIS 6, Weak SSL Ciphers

Dear Experts,
I am getting the below message when we run the security scan for the server. where we have hosted our website. It is IIS 6, Windows 2003 server.

After googling and seeing experts exchange site knoledge base, I found 3 solutions from the experts.

Solution 1) :
Open "regedit" and find the key
HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers.
And disable the below ...
DES 56/56
RC2 40/128
RC4 40/128
RC4 56/128.  

Solution 2): To disable below protocols..
\PCT 1.0\Client
\PCT 1.0\Server
\SSL 2.0\Client
\SSL 2.0\Server

Solution3):
go to the properties of your site in IIS and click on the directory security tab.  Verify that the boxes are checked next to Require Secure Channel and Require 128 bit encryption.

My question is: Should I implement all the above 3 changes that are mentioned.? Or, and 1 or 2 of the above will do?
I am confused as Ineed to implement this at my client place.

Appriciate your clarification.

 
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RESULT OF THE SECURITY SCAN:(failed)---**********************
The Secure Socket Layer (SSL) protocol allows for secure communication between a client and a server.
 
SSL encryption ciphers are classified based on encryption key length as follows:
 
HIGH - key length larger than 128 bits
 
MEDIUM - key length equal to 128 bits
 
LOW - key length smaller than 128 bits
 
Messages encrypted with LOW encryption ciphers are easy to decrypt. Commercial SSL servers should only support MEDIUM or HIGH strength
 
ciphers to guarantee transaction security.
 
The following link provides more information about this vulnerability:
 
Analysis of the SSL 3.0 protocol
 
Please note that this detection only checks for weak cipher support at the SSL layer. Some servers may implement additional protection at the data
 
layer. For example, some SSL servers and SSL proxies (such as SSL accelerators) allow cipher negotiation to complete but send back an error
 
message and abort further communication on the secure channel. This vulnerability may not be exploitable for such configurations.
 
IMPACT:
 
An attacker can exploit this vulnerability to decrypt secure communications without authorization.
 
SOLUTION:
 
Disable support for LOW encryption ciphers.
 
 
 
Apache
 
Typically, for Apache/mod_ssl, httpd.conf or ssl.conf should have the following lines:
 
SSLProtocol -ALL +SSLv3 +TLSv1
 
SSLCipherSuite ALL:!aNULL:!ADH:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM
 
For Apache/apache_ssl include the following line in the configuration file (httpsd.conf):
 
SSLRequireCipher ALL:!aNULL:!ADH:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM
 
Tomcat
 
sslProtocol="SSLv3"
 
ciphers="SSL_RSA_WITH_RC4_128_MD5,SSL_RSA_WITH_RC4_128_SHA,SSL_DHE_RSA_W
 
ITH_3DES_EDE_CBC_SHA"
 
IIS
 
How to Restrict the Use of Certain Cryptographic Algorithms and Protocols in Schannel.dll (Windows restart required)
 
How to disable PCT 1.0, SSL 2.0, SSL 3.0, or TLS 1.0 in Internet Information Services (Windows restart required)
 
Security Guidance for IIS
[+][-]09/21/09 02:35 PM, ID: 25387859Accepted Solution

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About this solution

Zones: Microsoft IIS Web Server, Secure Socket Layer (SSL) & HTTPS
Tags: IIS 6, Weak SSL Ciphers
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Solution Provided By: djpazza
Participating Experts: 1
Solution Grade: A
 
 
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