Ubuntu 9.10 / 10.04 LTS / 10.10 : sudo vulnerability (USN-1046-1)

2011-01-21T00:00:00
ID UBUNTU_USN-1046-1.NASL
Type nessus
Reporter Tenable
Modified 2016-05-27T00:00:00

Description

Alexander Kurtz discovered that sudo would not prompt for a password when a group was specified in the Runas_Spec. A local attacker could exploit this to execute arbitrary code as the specified group if sudo was configured to allow the attacker to use a program as this group. The group Runas_Spec is not used in the default installation of Ubuntu.

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-1046-1. 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(51643);
  script_version("$Revision: 1.7 $");
  script_cvs_date("$Date: 2016/05/27 14:13:23 $");

  script_cve_id("CVE-2011-0010");
  script_bugtraq_id(45774);
  script_xref(name:"USN", value:"1046-1");

  script_name(english:"Ubuntu 9.10 / 10.04 LTS / 10.10 : sudo vulnerability (USN-1046-1)");
  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:
"Alexander Kurtz discovered that sudo would not prompt for a password
when a group was specified in the Runas_Spec. A local attacker could
exploit this to execute arbitrary code as the specified group if sudo
was configured to allow the attacker to use a program as this group.
The group Runas_Spec is not used in the default installation of
Ubuntu.

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 sudo and / or sudo-ldap packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P");
  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:sudo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:sudo-ldap");
  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:9.10");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/01/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/01/21");
  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:"^(9\.10|10\.04|10\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 9.10 / 10.04 / 10.10", "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:"9.10", pkgname:"sudo", pkgver:"1.7.0-1ubuntu2.6")) flag++;
if (ubuntu_check(osver:"9.10", pkgname:"sudo-ldap", pkgver:"1.7.0-1ubuntu2.6")) flag++;
if (ubuntu_check(osver:"10.04", pkgname:"sudo", pkgver:"1.7.2p1-1ubuntu5.3")) flag++;
if (ubuntu_check(osver:"10.04", pkgname:"sudo-ldap", pkgver:"1.7.2p1-1ubuntu5.3")) flag++;
if (ubuntu_check(osver:"10.10", pkgname:"sudo", pkgver:"1.7.2p7-1ubuntu2.1")) flag++;
if (ubuntu_check(osver:"10.10", pkgname:"sudo-ldap", pkgver:"1.7.2p7-1ubuntu2.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, "sudo / sudo-ldap");
}