Ubuntu 4.10 / 5.04 : util-linux vulnerability (USN-184-1)
High Nessus Plugin ID 20595
SynopsisThe remote Ubuntu host is missing one or more security-related patches.
DescriptionDavid Watson discovered that 'umount -r' removed some restrictive mount options like the 'nosuid' flag. If /etc/fstab contains user-mountable removable devices which specify the 'nosuid' flag (which is common practice for such devices), a local attacker could exploit this to execute arbitrary programs with root privileges by calling 'umount -r' on a removable device.
This does not affect the default Ubuntu configuration. Since Ubuntu mounts removable devices automatically, there is normally no need to configure them manually in /etc/fstab.
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
SolutionUpdate the affected packages.