Debian DLA-1035-1 : qemu security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1035-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(101909);
  script_version("3.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2016-9602", "CVE-2016-9603", "CVE-2017-7377", "CVE-2017-7471", "CVE-2017-7493", "CVE-2017-7718", "CVE-2017-7980", "CVE-2017-8086");

  script_name(english:"Debian DLA-1035-1 : qemu security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"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.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2017/07/msg00027.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/qemu"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qemu");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qemu-keymaps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qemu-system");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qemu-user");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qemu-user-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:qemu-utils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/07/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/24");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"qemu", reference:"1.1.2+dfsg-6+deb7u22")) flag++;
if (deb_check(release:"7.0", prefix:"qemu-keymaps", reference:"1.1.2+dfsg-6+deb7u22")) flag++;
if (deb_check(release:"7.0", prefix:"qemu-system", reference:"1.1.2+dfsg-6+deb7u22")) flag++;
if (deb_check(release:"7.0", prefix:"qemu-user", reference:"1.1.2+dfsg-6+deb7u22")) flag++;
if (deb_check(release:"7.0", prefix:"qemu-user-static", reference:"1.1.2+dfsg-6+deb7u22")) flag++;
if (deb_check(release:"7.0", prefix:"qemu-utils", reference:"1.1.2+dfsg-6+deb7u22")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
  else security_hole(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");