Libvirt Security Notice: LSN-2013-0018 ====================================== Summary: Unsafe usage of paths under /proc/$PID/root by the LXC driver Reported on: 20131217 Published on: 20131217 Fixed on: 20140219 Reported by: Reco <recoverym4n(a)gmail.com&gt; Patched by: Reco <recoverym4n(a)gmail.com&gt;, Eric Blake <eblake(a)redhat.com&gt;, Daniel Berrange <berrange(a)redhat.com&gt; See also: CVE-2013-6456, debian bug #732394 Description ----------- The LXC driver will open paths under /proc/$PID/root for some operations it performs on running guests. For the virDomainShutdown and virDomainReboot APIs it will use this to access the /dev/initctl path in the container. For the virDomainDeviceAttach / virDomainDeviceDettach APIs it will use this to create device nodes in the container's /dev filesystem. If any of the path components under control of the container are symlinks the container can cause the libvirtd daemon to access the incorrect files. Impact ------ A container can cause the administrator to shutdown or reboot the host OS if /dev/initctl in the container is made to be an absolute symlink back to itself or /run/initctl. A container can cause the host administrator to mknod in an arbitrary host directory when invoking the virDomainDeviceAttach API by replacing '/dev' with an absolute symlink. A container can cause the host administrator to delete host device when invoking the virDomainDeviceDettach API by replacing '/dev' with an absolute symlink. Workaround ---------- Do not use the virDomainShutdown or virDomainReboot APIs without also passing the VIR_DOMAIN_SHUTDOWN_SIGNAL or VIR_DOMAIN_REBOOT_SIGNAL flags respectively. These will cause the LXC driver to send a SIGTERM or SIGHUP signal respectively, to the init process instead of using /dev/initct.. Do not use the virDomainDeviceAttach or virDomainDeviceDetach APIs at all unless the guest OS is trusted. Affected product ---------------- Name: libvirt Repository: git://libvirt.org/git/libvirt.git http://libvirt.org/git/?p=libvirt.git Branch: master 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: v1.0.0 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 by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: aebbcdd33c8c18891f0bdbbf8924599a28152c9c Fixed by: 4dd3a7d5bc44980135a1b11810ba9aeab42a4a59 Fixed by: 7fba01c15c1f886b4235825692b4c13e88dd9f7b Fixed by: 1754c7f0ab1407dcf7c89636a35711dd9b1febe1 Fixed by: 1cadeafcaa422844a27ef622e2a7041d0235bcb3 Fixed by: 5fc590ad9f4071350a8df4d567ba88baacc8334d Branch: v1.0.1-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Branch: v1.0.2-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Branch: v1.0.3-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Branch: v1.0.4-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Branch: v1.0.5-maint Broken in: v1.0.5.1 Broken in: v1.0.5.2 Broken in: v1.0.5.3 Broken in: v1.0.5.4 Broken in: v1.0.5.5 Broken in: v1.0.5.6 Broken in: v1.0.5.7 Broken in: v1.0.5.8 Broken in: v1.0.5.9 Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: f84056cf6166332b1f15f3e6584a88f5d42273fe Fixed by: 0e9fee68b3bff24e4d3ab48de8129946202f3bc0 Fixed by: 9849cf6d89e5665667a0df449ddc3fd5582da242 Fixed by: 21821ed4d1faf5bf563a26e8ac7cd2eb0450d322 Fixed by: e57058cfe827b1971ca0dee224ff273c9cad7756 Fixed by: e1e7e05376faf1ed471cb5c1d1e0415458f2af7d Branch: v1.0.6-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: e9941eee1a3c1cb0af7bc39076eb0e8c2c4eb603 Fixed by: 84cf9af8d9a803f2e12df0b8b0c2bd2de544cf93 Fixed by: f8706947b86e6de2961aacddb5eb2345d9c033b4 Fixed by: 081e0fabfd8c0f5c3f2c869ddcf11710c445a962 Fixed by: b2a853e1f6aea9683a30eafd2b069b8be0fcf898 Fixed by: bd9ec4506e29a9ce682961eee99d0326ed64145d Branch: v1.1.0-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: 61c7e0b66e8b37d4ea64024c100d2ed467d5cb47 Fixed by: 43720035b7f4c175ef2594296d874bc1910840b3 Fixed by: 212414281f0001da78f2312d7f52dcf124317fc9 Fixed by: c17dd7ede2affd147ffdc5e8daef85939bda0dd0 Fixed by: ed46a680a02cf96b229a89f74ddbab69522c9ef5 Fixed by: 807db4a30ee903f973d496b3293d9e6aaa511174 Branch: v1.1.1-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: 6ecb7bc3aed7f60edad5289c9b0cfcf99eee6611 Fixed by: 72a4c29ca72789b13de1ed9cb96df9fb2b0fdde4 Fixed by: 83f83508e128275bd1b74988162dc6b9f86e00ee Fixed by: 398c88edfaef50b9b59eb2d9a61b07c9c940a661 Fixed by: dd055960df60c536957664f0ae3c591feecf7b09 Fixed by: 14d69bd00e4455a1d174d14c5af73975cf9e904a Branch: v1.1.2-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: f639b2d17ce935b650bb2aca7bdd8d727cab8b02 Fixed by: a06bdfcb446f182e490f70422a8431c3bcb2c801 Fixed by: 77ddbad2a9272239a09673c5d6993793308514e9 Fixed by: a6e9270ec79924fabd5a872984bb5d38eaf3df8a Fixed by: eae2a2ada81c5828991bb1b9438f7556a7e51ce8 Fixed by: 21368274a9aa91e8a5f0addb3a6bba8dad91e334 Branch: v1.1.3-maint Broken in: v1.1.3.1 Broken in: v1.1.3.2 Broken in: v1.1.3.3 Fixed in: v1.1.3.4 Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: a3a3cfcb7c400bcde198b5b929ff2d4f889dee78 Fixed by: cb016b9ef1a6d786657a98546db8412f86510367 Fixed by: 72e379ed93b4707e26bbc5e3457a85833f50eb1a Fixed by: fcf05c194cb1cca6b5c703073b97ed1408a2c546 Fixed by: d5c0b57fffbe651c425b4de6c11712030cce7e7e Fixed by: fef343339127b989746214b86901553da6d17863 Branch: v1.1.4-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: 28681077373f1fa567b7f56117a22047f90925fe Fixed by: 0e931dfcda308fbb84eef42bc92e257e39af083d Fixed by: 3101022b4d4fee46916b87b1c21a3956a91d94b2 Fixed by: 1d1daaf58677cfa843b6891a98dc6cdb42116434 Fixed by: 80f57ec4224af65392db09fb8f47be7434e2fc86 Fixed by: ba4065b6f64fca7706070b8458fdf0bc06115b9b Branch: v1.2.0-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: 3e97a53caa9adddd47da1c22dbed81ef2e02f735 Fixed by: 17188260657e095f5d210bc73ba1661875a8f885 Fixed by: 70665ec5f2cd910666bc703727dc6d7c15efe7bf Fixed by: 3f43a7727ac068de8aac6b9c030b38fb3cb1426d Fixed by: cd48d62aca488a116b47073be2607653a1d3305e Fixed by: 8fca7a4fa6b40d21723008d2092536349f20517d Branch: v1.2.1-maint Broken by: cbb106f807b32f1f6af22d1e92fe0ff9ba6d73b3 Broken by: de858e3fa7ffcab5f80d07f8a74d94cbaf8716b9 Broken by: ed77abc58bc5a6837a5021f26e1a335dbfb477bf Broken by: a5efb3190913b6903775ca3756f79443d4ea8a5b Broken by: 4ad6a013304f6fe29b0866742c902054bfbcf23f Fixed by: 8b546028f901dc414463678574ceabbacc37c4cb Fixed by: b0ed2d94ace3c57198ce7b4793f906abf5397e36 Fixed by: ee1269eecd3566729f3909db624f7ebd7bf1b84a Fixed by: b9997828231b3492252cb6d9a0ad4f3dc522791e Fixed by: 51a897a22e1c031edd46fd077487a2f8e649cb9f Fixed by: ad52184399aa414fa3d7e2756e4ea6a45ec0d3a3 -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|