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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-29915] SCRAM-SHA-1 mechanism should respect &quot;y&quot; in gs2-cbind-flag</title>
                <link>https://jira.mongodb.org/browse/SERVER-29915</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://tools.ietf.org/html/rfc5802&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SCRAM&lt;/a&gt; defines the gs2-cbind-flag parameter as follows:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   gs2-cbind-flag  = (&quot;p=&quot; cb-name) / &quot;n&quot; / &quot;y&quot;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                     ;; &quot;n&quot; -&amp;gt; client doesn&apos;t support channel binding.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                     ;; &quot;y&quot; -&amp;gt; client does support channel binding&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                     ;;        but thinks the server does not.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                     ;; &quot;p&quot; -&amp;gt; client requires channel binding.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                     ;; The selected channel binding follows &quot;p=&quot;.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This is a Man-in-the-Middle protection measure, for clients which must detect if a remote server supports channel binding. If a Man-in-the-Middle manipulates traffic, and tricks the client into believing that the server did not support channel binding, the client must set this flag to &quot;y&quot;. If the server supports channel binding and sees &quot;y&quot;, that is an error. If, more likely, the MitM edits the client&apos;s message, and the server sees &quot;n&quot;, then the client and server will not be able to negotiate a shared secret and authentication will fail.&lt;/p&gt;

&lt;p&gt;MongoDB currently fails authentication attempts which send anything other than &quot;n&quot;. Our server and our drivers do not support channel binding, so they send &quot;n&quot;, so this hasn&apos;t been an issue. However, if a future driver did support channel binding, and detected that an old server did not support it, it would have to send the server &quot;y&quot;. Today, that would cause authentication to fail.&lt;/p&gt;</description>
                <environment></environment>
        <key id="399143">SERVER-29915</key>
            <summary>SCRAM-SHA-1 mechanism should respect &quot;y&quot; in gs2-cbind-flag</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="13201">Fixed</resolution>
                                        <assignee username="spencer.jackson@mongodb.com">Spencer Jackson</assignee>
                                    <reporter username="spencer.jackson@mongodb.com">Spencer Jackson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Jun 2017 00:00:43 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:36 +0000</updated>
                            <resolved>Thu, 3 Aug 2017 18:25:29 +0000</resolved>
                                                    <fixVersion>3.5.12</fixVersion>
                                    <component>Security</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1645620" author="xgen-internal-githook" created="Thu, 10 Aug 2017 20:58:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Spencer Jackson&apos;, &apos;email&apos;: &apos;spencer.jackson@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29915&quot; title=&quot;SCRAM-SHA-1 mechanism should respect &amp;quot;y&amp;quot; in gs2-cbind-flag&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29915&quot;&gt;&lt;del&gt;SERVER-29915&lt;/del&gt;&lt;/a&gt;: Respect &quot;y&quot; in gs2-cbind-flag in SCRAM&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/07d4d94b06c6899699410312e20ef33d954ddbd1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/07d4d94b06c6899699410312e20ef33d954ddbd1&lt;/a&gt;&lt;/p&gt;</comment>
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