libguestfs is a library for accessing and modifying guest disk images. It was found that guestfish, which enables shell scripting and command line access to libguestfs, insecurely created the temporary directory used to store the network socket when started in server mode (using the "--listen" option). If guestfish were run with the "--listen" option, a local attacker could use this flaw to intercept and modify other users' guestfish commands, allowing them to perform arbitrary guestfish actions (such as modifying virtual machines) with the privileges of a different user, or use this flaw to obtain authentication credentials.

Acknowledgements:

This issue was discovered by Michael Scherer of the Red Hat Regional IT team.

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