Impact: Important Public Date: 2019-06-20 CWE: CWE-284 Bugzilla: 1720114: CVE-2019-10166 libvirt: virDomainManagedSaveDefineXML API exposed to readonly clients It was discovered that libvirtd would permit readonly clients to use the virDomainManagedSaveDefineXML() API, which would permit them to modify managed save state files. If a managed save had already been created by a privileged user, a local attacker could modify this file such that libvirtd would execute an arbitrary program when the domain was resumed.
Find out more about CVE-2019-10166 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 7.8 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Changed |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | redhat-virtualization-host | Affected |
| Red Hat Gluster Storage 3 | libvirt | Not affected |
| Red Hat Enterprise Linux 8 | virt:rhel/libvirt | Affected |
| Red Hat Enterprise Linux 7 | libvirt | Affected |
| Red Hat Enterprise Linux 6 | libvirt | Not affected |
| Red Hat Enterprise Linux 5 | libvirt | Not affected |
The Unix permissions of libvirt's read-only socket can be made more restrictive than the default (0777) by editing `/etc/libvirt/libvirtd.conf`. The settings `unix_sock_group = libvirt` and `unix_sock_ro_perms = 0770` will restrict access to only members of `libvirt`, who already have management access to virtual machines.
Vulmon