GLSA-201612-10 : libvirt: Directory traversal
Low Nessus Plugin ID 95525
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe remote host is affected by the vulnerability described in GLSA-201612-10 (libvirt: Directory traversal)
Normally, only privileged users can coerce libvirt into creating or opening existing files using the virStorageVol APIs; and such users already have full privilege to create any domain XML.
But in the case of fine-grained ACLs, it is feasible that a user can be granted storage_vol:create but not domain:write, and it violates assumptions if such a user can abuse libvirt to access files outside of the storage pool.
When fine-grained Access Control Lists (ACL) are in effect, an authenticated local user with storage_vol:create permission but without domain:write permission maybe able to create or access arbitrary files outside of the storage pool.
Don’t make use of fine-grained Access Control Lists (ACL) in libvirt;
In Gentoo, libvirt’s ACL support is disable by default unless you enable the “policykit” USE flag.
SolutionAll libvirt users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=app-emulation/libvirt-1.2.21-r1'