A vulnerability was found in PackageKit in the way some of the methods exposed by the Transaction interface examine files without dropping privileges. The InstallFiles method, for example, will fail silently with a non-existing file, however if the file exists it will read the contents of the file and take longer to return than a non-existing file will. This vulnerability allows a local user to know whether a file owned by root or other users exists.
Created PackageKit tracking bugs for this issue:
Affects: fedora-all [bug 2064361]