[Libvirt-announce] LSN-2019-0004 virDomainSaveImageGetXMLDesc does not check for read-only connection
Ján Tomko
jtomko at redhat.com
Mon Jun 24 12:33:45 UTC 2019
Libvirt Security Notice: LSN-2019-0004
======================================
Summary: virDomainSaveImageGetXMLDesc does not check for
read-only connection
Reported on: 20190604
Published on: 20190620
Fixed on: 20190620
Reported by: Matthias Gerstner <mgerstner at suse.de>
Patched by: Ján Tomko <Ján Tomko>
See also: CVE-2019-10161
Description
-----------
The virDomainSaveImageGetXMLDesc accesses and parses arbitrary files
without checking for the read-only connection. This allows
unprivileged users to check for existence of arbitrary files or
executing arbitrary binaries with elevated privileges.
Impact
------
The default libvirt configuration allows all local user accounts
read-only access to the libvirtd daemon. Any local user can check
for the existence of an arbitrary file by watching for a different
error message. Additionally, since v1.2.19, by providing a crafted
save file pointing to an arbitrary emulator, executing arbitrary
binaries as the configured QEMU user is possible. Since v5.1.0, the
emulator binary is run with CAP_DAC_OVERRIDE, essentially having
root privileges.
Workaround
----------
Edit the /etc/libvirt/libvirtd.conf configuration file, to set the
'unix_sock_ro_perms = "0700"' to prevent local users from connecting
to libvirt. Alternatively setup a policy kit rule to prevent them
access without first authenticating as root.
Affected product
----------------
Name: libvirt
Repository: git://libvirt.org/git/libvirt.git
http://libvirt.org/git/?p=libvirt.git
Branch: master
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