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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-14032] v2.6 mongos doesn&apos;t verify _id is present for config server upserts</title>
                <link>https://jira.mongodb.org/browse/SERVER-14032</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 Jul 22, 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;
In a sharded cluster, mongos does not verify that the _id field is present for upserts to multiple config servers. This can lead to inconsistent _id fields on different config servers &lt;b&gt;if the id is not explicitly provided&lt;/b&gt;. &lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Manipulating config metadata manually via a mongos may lead to inconsistent config servers and unexpected behavior in the sharded system.  Metadata changes via normal command operations (shardCollection, balance, split, move, and merge) are not affected.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
Always ensure that any manual upserts of config metadata (including data in the &quot;admin&quot; database) contain an equality match on the _id value for the query portion of the upsert.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
All production releases since version 2.6.0 are affected by this issue.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIX VERSION&lt;/b&gt;&lt;br/&gt;
The fix is included in the 2.6.4 production release.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION DETAILS&lt;/b&gt;&lt;br/&gt;
Checks were implemented to prevent upserts without valid _id in the query part of the upsert.&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;This can lead to mismatched _ids on documents - client code should not use this behavior (2.4 disallows) but it should also be illegal in v2.6.&lt;/p&gt;</description>
                <environment></environment>
        <key id="137733">SERVER-14032</key>
            <summary>v2.6 mongos doesn&apos;t verify _id is present for config server upserts</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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 May 2014 18:21:30 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:53 +0000</updated>
                            <resolved>Fri, 6 Jun 2014 18:50:45 +0000</resolved>
                                    <version>2.6.1</version>
                                    <fixVersion>2.6.4</fixVersion>
                    <fixVersion>2.7.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="660929" author="xgen-internal-githook" created="Wed, 16 Jul 2014 18:37:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14032&quot; title=&quot;v2.6 mongos doesn&amp;#39;t verify _id is present for config server upserts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14032&quot;&gt;&lt;del&gt;SERVER-14032&lt;/del&gt;&lt;/a&gt; verify _id present for upserts to multiple config servers&lt;br/&gt;
(cherry picked from commit 108ec7640743a97d2e02a081ef16d0c4da748c67)&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d66794ceb55fe8c2aaefb29246f907a82069a676&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d66794ceb55fe8c2aaefb29246f907a82069a676&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="610410" author="xgen-internal-githook" created="Thu, 5 Jun 2014 22:32:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14032&quot; title=&quot;v2.6 mongos doesn&amp;#39;t verify _id is present for config server upserts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14032&quot;&gt;&lt;del&gt;SERVER-14032&lt;/del&gt;&lt;/a&gt; verify _id present for upserts to multiple config servers&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/108ec7640743a97d2e02a081ef16d0c4da748c67&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/108ec7640743a97d2e02a081ef16d0c4da748c67&lt;/a&gt;&lt;/p&gt;</comment>
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