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Ubuntu 21.10 & 20.04 LTS USN-5279-1 Moderate: Util-Linux FUSE Issue

ubuntu
Calendar Grey February 9, 2022
Dist Ubuntu Esm H88
Expose significant util-linux weaknesses causing FUSE filesystem complications in Ubuntu. Prompt updates recommended.
util-linux could be made to unmount FUSE filesystems belonging to other users.

Summary

util-linux could be made to unmount FUSE filesystems belonging to other

users.

Software Description:

- util-linux: miscellaneous system utilities

Details:

It was discovered that util-linux incorrectly handled unmounting FUSE

filesystems. A local attacker could possibly use this issue to unmount

FUSE filesystems belonging to other users.

Topics%20covered

Topics Covered

security advisory util-linux local attack ubuntu FUSE filesystem

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
  mount                           2.36.1-8ubuntu2.2
  util-linux                      2.36.1-8ubuntu2.2

Ubuntu 20.04 LTS:
  mount                           2.34-0.1ubuntu9.3
  util-linux                      2.34-0.1ubuntu9.3

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5279-1

CVE-2021-3995, CVE-2021-3996

February 09, 2022

Topics%20covered

Topics Covered

security advisory util-linux local attack ubuntu FUSE filesystem

Package Information

https://launchpad.net/ubuntu/+source/util-linux/2.36.1-8ubuntu2.2
https://launchpad.net/ubuntu/+source/util-linux/2.34-0.1ubuntu9.3

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