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Improper Check for Dropped Privileges

CVE-2022-0358

Severity High
Score 7.8/10

Summary

A flaw was found in the QEMU versions prior to 7.0.0-rc0 in "virtio-fs" shared file system daemon (virtiofsd) implementation. This flaw is strictly related to CVE-2018-13405. A local guest user can create files in the directories shared by "virtio-fs" with unintended group ownership in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of the group. This could allow a malicious unprivileged user inside the guest to gain access to resources accessible to the root group, potentially escalating their privileges within the guest. A malicious local user in the host might also leverage this unexpected executable file created by the guest to escalate their privileges on the host system.

  • LOW
  • LOCAL
  • HIGH
  • UNCHANGED
  • NONE
  • LOW
  • HIGH
  • HIGH

CWE-273 - Improper Check for Dropped Privileges

The software attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.

Advisory Timeline

  • Published