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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-7540] The MongoDB challenge response authentication takes place over clear text</title>
                <link>https://jira.mongodb.org/browse/SERVER-7540</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The following process appears to be used for authenticating the client:&lt;/p&gt;

&lt;p&gt;1. Client sends getnonce command to server.&lt;br/&gt;
2. Server replies with a random 16 character nonce.&lt;br/&gt;
3. Client creates a key using the following formula:&lt;/p&gt;

&lt;p&gt;Key = MD5(nonce + username + MD5(username + &#8220;:Mongo:&#8221; + password))&lt;/p&gt;

&lt;p&gt;4. Client sends the key, nonce, and the username to the server&lt;br/&gt;
5. Server compares the key to check whether or not to authenticate the user.&lt;/p&gt;

&lt;p&gt;The fact that the server uses a randomly generated nonce eliminates&lt;br/&gt;
the risk of a replay attack. However, a malicious user could listen to&lt;br/&gt;
the whole authentication conversation on the wire and attempt to brute force the password. The nonce and the username are known&lt;br/&gt;
so the malicious user would only need to guess the password and&lt;br/&gt;
compare keys.&lt;/p&gt;
</description>
                <environment>RHEL 6.2</environment>
        <key id="55098">SERVER-7540</key>
            <summary>The MongoDB challenge response authentication takes place over clear text</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="simon.harvey@citi.com">Simon Harvey</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Nov 2012 13:01:56 +0000</created>
                <updated>Fri, 15 Feb 2013 15:05:50 +0000</updated>
                            <resolved>Fri, 2 Nov 2012 14:20:59 +0000</resolved>
                                    <version>2.2.0</version>
                                                    <component>Security</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="184794" author="simon.harvey@citi.com" created="Fri, 9 Nov 2012 22:39:30 +0000"  >&lt;p&gt;Andy,&lt;/p&gt;

&lt;p&gt;Apologies for the delay responding on this - I had originally thought that this testing had been done with SSL already in place, but have just had confirmation from the tester that this wasn&apos;t the case and after re-testing he has confirmed that everything is correctly encrypted when SSL is used - so please close this down.&lt;/p&gt;

&lt;p&gt;Regards,&lt;/p&gt;

&lt;p&gt;        Simon.&lt;/p&gt;
</comment>
                            <comment id="181901" author="schwerin" created="Fri, 2 Nov 2012 14:20:59 +0000"  >&lt;p&gt;The solution for users on insecure networks is to use SSL or TLS support in Mongo to secure connections, or (less common) to construct a secure VPN.&lt;/p&gt;</comment>
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