Goroutine/file-descriptor leak in storage/pkg/archiveApplyLayer/ApplyUncompressedLayer on malformed layers

storage/pkg/archive.ApplyLayer and ApplyUncompressedLayer may, when processing corrupt or malicious inputs, leak a file descriptor; unbounded repeated calls can exhaust the process’ file descriptor limit.

A vulnerability was found in the netavark package, a network stack for containers used with Podman. Due to dns.podman search domain being removed, netavark may return external servers if a valid A/AAAA record is sent as a response. When creating a container with a given name, this name will be used as the hostname for the container itself, as the podman's search domain is not added anymore the container is using the host's resolv.conf, and the DNS resolver will try to look into the search domains contained on it. If one of the domains contain a name with the same hostname as the running container, the connection will forward to unexpected external servers.

Netavark was recently changed, when being used with podman, to remove the dns.podman search domain in detriment of using the host's search domain in the container. This leads to a possible DNS resolve confusion in some scenarios where the container created using podman have the same hostname as an external service. This may lead to containers communicating to unexpected servers instead of the desired one.