Debian Long Term Support / LTS Security Information / 2017 / Security Information -- DLA-965-1 qemu-kvm

Debian Security Advisory

DLA-965-1 qemu-kvm -- LTS security update

Date Reported:

31 May 2017

Affected Packages:

qemu-kvm

Vulnerable:

Yes

Security database references:

In Mitre's CVE dictionary: CVE-2016-9602, CVE-2017-7377, CVE-2017-7471, CVE-2017-7493, CVE-2017-8086.

More information:

Several vulnerabilities were discovered in qemu-kvm, a full virtualization solution for Linux hosts on x86 hardware with x86 guests based on the Quick Emulator(Qemu).

• CVE-2016-9602

  Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support, is vulnerable to an improper link following issue. It could occur while accessing symbolic link files on a shared host directory.

  A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.

• CVE-2017-7377

  Quick Emulator(Qemu) built with the virtio-9p back-end support is vulnerable to a memory leakage issue. It could occur while doing a I/O operation via v9fs_create/v9fs_lcreate routine.

  A privileged user/process inside guest could use this flaw to leak host memory resulting in Dos.

• CVE-2017-7471

  Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing files on a shared host directory.

  A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.

• CVE-2017-7493

  Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing virtfs metadata files in mapped-file security mode.

  A guest user could use this flaw to escalate their privileges inside guest.

• CVE-2017-8086

  Quick Emulator(Qemu) built with the virtio-9p back-end support is vulnerable to a memory leakage issue. It could occur while querying file system extended attributes via 9pfs_list_xattr() routine.

  A privileged user/process inside guest could use this flaw to leak host memory resulting in Dos.

For Debian 7 Wheezy, these problems have been fixed in version 1.1.2+dfsg-6+deb7u22.

We recommend that you upgrade your qemu-kvm packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS