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@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 Broken in: v0.9.4 Broken in: v0.9.5 Broken in: v0.9.6 Broken in: v0.9.7 Broken in: v0.9.8 Broken in: v0.9.9 Broken in: v0.9.10 Broken in: v0.9.11 Broken in: v0.9.12 Broken in: v0.9.13 Broken in: v0.10.0 Broken in: v0.10.1 Broken in: v0.10.2 Broken in: v1.0.0 Broken in: v1.0.1 Broken in: v1.0.2 Broken in: v1.0.3 Broken in: v1.0.4 Broken in: v1.0.5 Broken in: v1.0.6 Broken in: v1.1.0 Broken in: v1.1.1 Broken in: v1.1.2 Broken in: v1.1.3 Broken in: v1.1.4 Broken in: v1.2.0 Broken in: v1.2.1 Broken in: v1.2.2 Broken in: v1.2.3 Broken in: v1.2.4 Broken in: v1.2.5 Broken in: v1.2.6 Broken in: v1.2.7 Broken in: v1.2.8 Broken in: v1.2.9 Broken in: v1.2.10 Broken in: v1.2.11 Broken in: v1.2.12 Broken in: v1.2.13 Broken in: v1.2.14 Broken in: v1.2.15 Broken in: v1.2.16 Broken in: v1.2.17 Broken in: v1.2.18 Broken in: v1.2.19 Broken in: v1.2.20 Broken in: v1.2.21 Broken in: v1.3.0 Broken in: v1.3.1 Broken in: v1.3.2 Broken in: v1.3.3 Broken in: v1.3.4 Broken in: v1.3.5 Broken in: v2.0.0 Broken in: v2.1.0 Broken in: v2.2.0 Broken in: v2.3.0 Broken in: v2.4.0 Broken in: v2.5.0 Broken in: v3.0.0 Broken in: v3.1.0 Broken in: v3.2.0 Broken in: v3.3.0 Broken in: v3.4.0 Broken in: v3.5.0 Broken in: v3.6.0 Broken in: v3.7.0 Broken in: v3.8.0 Broken in: v3.9.0 Broken in: v3.10.0 Broken in: v4.0.0 Broken in: v4.1.0 Broken in: v4.2.0 Broken in: v4.3.0 Broken in: v4.4.0 Broken in: v4.5.0 Broken in: v4.6.0 Broken in: v4.7.0 Broken in: v4.8.0 Broken in: v4.9.0 Broken in: v4.10.0 Broken in: v5.0.0 Broken in: v5.1.0 Broken in: v5.2.0 Broken in: v5.3.0 Broken in: v5.4.0 Broken by: d2a929d4b371a382d5508ae6bef80e392a34f8b9 Fixed by: aed6a032cead4386472afb24b16196579e239580 Branch: v0.9.6-maint Broken in: v0.9.6.1 Broken in: v0.9.6.2 Broken in: v0.9.6.3 Broken in: v0.9.6.4 Broken by: d2a929d4b371a382d5508ae6bef80e392a34f8b9 Branch: v0.9.11-maint Broken 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