Ubuntu 10.04 LTS / 10.10 / 11.04 : qemu-kvm vulnerability (USN-1177-1)

2011-07-28T00:00:00
ID UBUNTU_USN-1177-1.NASL
Type nessus
Reporter Tenable
Modified 2016-05-26T00:00:00

Description

Andrew Griffiths discovered that QEMU did not correctly drop privileges when using the 'runas' argument. Under certain circumstances a local attacker could exploit this to escalate privileges.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-1177-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include("compat.inc");

if (description)
{
  script_id(55717);
  script_version("$Revision: 1.7 $");
  script_cvs_date("$Date: 2016/05/26 16:14:08 $");

  script_cve_id("CVE-2011-2527");
  script_bugtraq_id(48659);
  script_xref(name:"USN", value:"1177-1");

  script_name(english:"Ubuntu 10.04 LTS / 10.10 / 11.04 : qemu-kvm vulnerability (USN-1177-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Andrew Griffiths discovered that QEMU did not correctly drop
privileges when using the 'runas' argument. Under certain
circumstances a local attacker could exploit this to escalate
privileges.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Update the affected qemu-kvm, qemu-kvm-extras and / or
qemu-kvm-extras-static packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:qemu-kvm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:qemu-kvm-extras");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:qemu-kvm-extras-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.04");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/07/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/07/28");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2011-2016 Canonical, Inc. / NASL script (C) 2011-2016 Tenable Network Security, Inc.");
  script_family(english:"Ubuntu Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! ereg(pattern:"^(10\.04|10\.10|11\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 10.04 / 10.10 / 11.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"10.04", pkgname:"qemu-kvm", pkgver:"0.12.3+noroms-0ubuntu9.15")) flag++;
if (ubuntu_check(osver:"10.04", pkgname:"qemu-kvm-extras", pkgver:"0.12.3+noroms-0ubuntu9.15")) flag++;
if (ubuntu_check(osver:"10.04", pkgname:"qemu-kvm-extras-static", pkgver:"0.12.3+noroms-0ubuntu9.15")) flag++;
if (ubuntu_check(osver:"10.10", pkgname:"qemu-kvm", pkgver:"0.12.5+noroms-0ubuntu7.10")) flag++;
if (ubuntu_check(osver:"10.10", pkgname:"qemu-kvm-extras", pkgver:"0.12.5+noroms-0ubuntu7.10")) flag++;
if (ubuntu_check(osver:"10.10", pkgname:"qemu-kvm-extras-static", pkgver:"0.12.5+noroms-0ubuntu7.10")) flag++;
if (ubuntu_check(osver:"11.04", pkgname:"qemu-kvm", pkgver:"0.14.0+noroms-0ubuntu4.4")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "qemu-kvm / qemu-kvm-extras / qemu-kvm-extras-static");
}