A flaw was found in the QEMU 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.
The product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.
| Link | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=2044863 | issue tracking third party advisory patch |
| https://gitlab.com/qemu-project/qemu/-/commit/449e8171f96a6a944d1f3b7d3627ae059eae21ca | third party advisory patch |
| https://access.redhat.com/security/cve/CVE-2022-0358 | third party advisory |
| https://security.netapp.com/advisory/ntap-20221007-0008/ | third party advisory |