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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-10840] injection is too easy with agg framework syntax</title>
                <link>https://jira.mongodb.org/browse/SERVER-10840</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The aggregation framework supports a syntax with dollar sign field name selection on the right-hand side.  This creates a potential for an injection style attack analogous to sql injection.&lt;/p&gt;

&lt;p&gt;There is now a $literal operator (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5782&quot; title=&quot;need a $literal operator to help prevent injection attacks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5782&quot;&gt;&lt;del&gt;SERVER-5782&lt;/del&gt;&lt;/a&gt;).  However the claim of this ticket is that that isn&apos;t sufficient.  It does solve an issue &amp;#8211; you can use dollar signs in literals &amp;#8211; but doesn&apos;t really solve the injection issue.  The client side if smart enough always to use $literal could just as easily look for leading dollar signs instead for example.&lt;/p&gt;

&lt;p&gt;Of particular importance here would be if the aggregation framework syntax migrates into the regular query syntax.  Then if one failed to use $literal, it would be likely there would be a good number of apps out there with an injection vulnerability either with projection or querying. &lt;/p&gt;

&lt;p&gt;One solution would be to use a lhs rather than rhs operator e.g. : &lt;/p&gt;

{ x : &quot;$foo&quot; } 
&lt;p&gt;  -&amp;gt;&lt;br/&gt;
{ x : &lt;/p&gt;
{ $get : &quot;foo&quot; }
&lt;p&gt; }&lt;/p&gt;

&lt;p&gt;The main concern here is if this operator were to move beyond the $project operator phrases and into other things.&lt;/p&gt;</description>
                <environment></environment>
        <key id="91048">SERVER-10840</key>
            <summary>injection is too easy with agg framework syntax</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="dwight@mongodb.com">Dwight Merriman</reporter>
                        <labels>
                    </labels>
                <created>Sun, 22 Sep 2013 14:55:26 +0000</created>
                <updated>Tue, 6 Dec 2022 05:17:22 +0000</updated>
                                            <version>2.5.2</version>
                                                    <component>Aggregation Framework</component>
                    <component>Querying</component>
                    <component>Security</component>
                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>16</watches>
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