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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-13850] Make sure user cache entry is up to date before using it to determine a user&apos;s roles in user management commands on mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-13850</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of May 14, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
When a &lt;tt&gt;grantRolesToUser&lt;/tt&gt; or &lt;tt&gt;revokeRolesFromUser&lt;/tt&gt; command is run on a &lt;tt&gt;mongos&lt;/tt&gt;, the &lt;tt&gt;mongos&lt;/tt&gt; does not check whether the entry in the user cache for that user is out of date. It can thus overwrite role changes that were made from another &lt;tt&gt;mongos&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
In systems where users are administered via multiple &lt;tt&gt;mongos&lt;/tt&gt; some changes may not persist and get overwritten. This can lead to users not having the correct permissions.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
Modify users only via a single &lt;tt&gt;mongos&lt;/tt&gt; if possible. If that is not an option, calling the &lt;tt&gt;invalidateUserCache&lt;/tt&gt; command before making any role changes will minimize the risk of overwriting changes from another &lt;tt&gt;mongos&lt;/tt&gt; (but not completely avoid it due to the existing race condition).&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
Version 2.6.0 and 2.6.1 were affected by this bug.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIX VERSION&lt;/b&gt;&lt;br/&gt;
The patch is included in the 2.6.2 production release.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION DETAILS&lt;/b&gt;&lt;br/&gt;
&lt;tt&gt;mongos&lt;/tt&gt; now ensures that the cache entry for a user document is up to date before updating a user. &lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;Currently it is possible to get into a situation where a user&apos;s roles are changed on one mongos, then another mongos receives a grantRolesToUser command and $sets the user&apos;s roles to something based on out of date information of the existing roles the user has.&lt;/p&gt;</description>
                <environment></environment>
        <key id="135193">SERVER-13850</key>
            <summary>Make sure user cache entry is up to date before using it to determine a user&apos;s roles in user management commands on mongos</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="9">Done</resolution>
                                        <assignee username="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 May 2014 20:05:12 +0000</created>
                <updated>Mon, 11 Jul 2016 17:18:00 +0000</updated>
                            <resolved>Wed, 14 May 2014 15:29:06 +0000</resolved>
                                    <version>2.6.1</version>
                                    <fixVersion>2.6.2</fixVersion>
                    <fixVersion>2.7.1</fixVersion>
                                    <component>Security</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="585502" author="xgen-internal-githook" created="Thu, 15 May 2014 21:45:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13850&quot; title=&quot;Make sure user cache entry is up to date before using it to determine a user&amp;#39;s roles in user management commands on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13850&quot;&gt;&lt;del&gt;SERVER-13850&lt;/del&gt;&lt;/a&gt; Make sure cache entry is up to date before using it to update a user&lt;br/&gt;
(cherry picked from commit 06033e18fb1fe66d00f130227317d9ae531bb6f5)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a07574aaa71a1fcea8239257bffef929f2fd53b3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a07574aaa71a1fcea8239257bffef929f2fd53b3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="583625" author="xgen-internal-githook" created="Wed, 14 May 2014 15:22:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;stbrody&apos;, u&apos;name&apos;: u&apos;Spencer T Brody&apos;, u&apos;email&apos;: u&apos;spencer@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13850&quot; title=&quot;Make sure user cache entry is up to date before using it to determine a user&amp;#39;s roles in user management commands on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13850&quot;&gt;&lt;del&gt;SERVER-13850&lt;/del&gt;&lt;/a&gt; Make sure cache entry is up to date before using it to update a user&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/06033e18fb1fe66d00f130227317d9ae531bb6f5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/06033e18fb1fe66d00f130227317d9ae531bb6f5&lt;/a&gt;&lt;/p&gt;</comment>
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