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    <link>https://vulnerability.circl.lu</link>
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      <title>GHSA-mq39-4gv4-mvpx — Moby's external DNS requests from 'internal' networks could lead to data exfiltration</title>
      <link>https://vulnerability.circl.lu/vuln/ghsa-mq39-4gv4-mvpx</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Go: github.com/docker/docker&lt;/p&gt;
&lt;p&gt;Moby is an open source container framework originally developed by Docker Inc. as Docker. It is a key component of Docker Engine, Docker Desktop, and other distributions of container tooling or runtimes. As a batteries-included container runtime, Moby comes with a built-in networking implementation that enables communication between containers, and between containers and external resources.&lt;/p&gt;
&lt;p&gt;Moby&amp;#39;s networking implementation allows for creating and using many networks, each with their own subnet and gateway. This feature is frequently referred to as custom networks, as each network can have a different driver, set of parameters, and thus behaviors. When creating a network, the `--internal` flag is used to designate a network as _internal_. The `internal` attribute in a docker-compose.yml file may also be used to mark a network _internal_, and other API clients may specify the `internal` parameter as well.&lt;/p&gt;
&lt;p&gt;When containers with networking are created, they are assigned unique network interfaces and IP addresses (typically from a non-routable [RFC 1918](https://datatracker.ietf.org/doc/html/rfc1918) subnet). The root network namespace (hereafter referred to as the &amp;#39;host&amp;#39;) serves as a router for non-internal networks, with a gateway IP that provides SNAT/DNAT to/from container IPs.&lt;/p&gt;
&lt;p&gt;Containers on an _internal_ network may communicate between each other, but are precluded from communicating with any networks the host has access to (LAN or WAN) as no default route is configured, a…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Go: github.com/docker/docker&lt;/p&gt;
&lt;p&gt;Moby is an open source container framework originally developed by Docker Inc. as Docker. It is a key component of Docker Engine, Docker Desktop, and other distributions of container tooling or runtimes. As a batteries-included container runtime, Moby comes with a built-in networking implementation that enables communication between containers, and between containers and external resources.&lt;/p&gt;
&lt;p&gt;Moby&amp;#39;s networking implementation allows for creating and using many networks, each with their own subnet and gateway. This feature is frequently referred to as custom networks, as each network can have a different driver, set of parameters, and thus behaviors. When creating a network, the `--internal` flag is used to designate a network as _internal_. The `internal` attribute in a docker-compose.yml file may also be used to mark a network _internal_, and other API clients may specify the `internal` parameter as well.&lt;/p&gt;
&lt;p&gt;When containers with networking are created, they are assigned unique network interfaces and IP addresses (typically from a non-routable [RFC 1918](https://datatracker.ietf.org/doc/html/rfc1918) subnet). The root network namespace (hereafter referred to as the &amp;#39;host&amp;#39;) serves as a router for non-internal networks, with a gateway IP that provides SNAT/DNAT to/from container IPs.&lt;/p&gt;
&lt;p&gt;Containers on an _internal_ network may communicate between each other, but are precluded from communicating with any networks the host has access to (LAN or WAN) as no default route is configured, a…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://vulnerability.circl.lu/vuln/ghsa-mq39-4gv4-mvpx</guid>
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