Debian Security Advisory

DLA-1035-1 qemu -- LTS security update

Date Reported:
21 Jul 2017
Affected Packages:
qemu
Vulnerable:
Yes
Security database references:
In Mitre's CVE dictionary: CVE-2016-9602, CVE-2016-9603, CVE-2017-7377, CVE-2017-7471, CVE-2017-7493, CVE-2017-7718, CVE-2017-7980, CVE-2017-8086.
More information:

Several vulnerabilities were discovered in qemu, a fast processor emulator. The Common Vulnerabilities and Exposures project identifies the following problems:

  • CVE-2016-9603

    qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator and the VNC display driver support is vulnerable to a heap buffer overflow issue. It could occur when Vnc client attempts to update its display after a vga operation is performed by a guest.

    A privileged user/process inside guest could use this flaw to crash the Qemu process resulting in DoS OR potentially leverage it to execute arbitrary code on the host with privileges of the Qemu process.

  • CVE-2017-7718

    qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds access issue. It could occur while copying VGA data via bitblt functions cirrus_bitblt_rop_fwd_transp_ and/or cirrus_bitblt_rop_fwd_.

    A privileged user inside guest could use this flaw to crash the Qemu process resulting in DoS.

  • CVE-2017-7980

    qemu-kvm built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to an out-of-bounds r/w access issues. It could occur while copying VGA data via various bitblt functions.

    A privileged user inside guest could use this flaw to crash the Qemu process resulting in DoS OR potentially execute arbitrary code on a host with privileges of Qemu process on the host.

  • 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 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