Ubuntu 8.10 / 9.04 : pam vulnerability (USN-828-1)

2009-09-09T00:00:00
ID UBUNTU_USN-828-1.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2009-2019 Canonical, Inc. / NASL script (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-04-02T00:00:00

Description

Russell Senior discovered that the system authentication module selection mechanism for PAM did not safely handle an empty selection. If an administrator had specifically removed the default list of modules or failed to chose a module when operating debconf in a very unlikely non-default configuration, PAM would allow any authentication attempt, which could lead to remote attackers gaining access to a system with arbitrary privileges. This did not affect default Ubuntu installations.

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.

                                        
                                            #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-828-1. 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(40906);
  script_version("1.12");
  script_cvs_date("Date: 2019/08/02 13:33:02");

  script_cve_id("CVE-2009-3232");
  script_xref(name:"USN", value:"828-1");

  script_name(english:"Ubuntu 8.10 / 9.04 : pam vulnerability (USN-828-1)");
  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:
"Russell Senior discovered that the system authentication module
selection mechanism for PAM did not safely handle an empty selection.
If an administrator had specifically removed the default list of
modules or failed to chose a module when operating debconf in a very
unlikely non-default configuration, PAM would allow any authentication
attempt, which could lead to remote attackers gaining access to a
system with arbitrary privileges. This did not affect default Ubuntu
installations.

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:"see_also",
    value:"https://usn.ubuntu.com/828-1/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_cwe_id(287);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-cracklib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-runtime");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam0g");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam0g-dev");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:8.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:9.04");

  script_set_attribute(attribute:"patch_publication_date", value:"2009/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/09/09");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2009-2019 Canonical, Inc. / NASL script (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  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:"^(8\.10|9\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 8.10 / 9.04", "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:"8.10", pkgname:"libpam-cracklib", pkgver:"1.0.1-4ubuntu5.6")) flag++;
if (ubuntu_check(osver:"8.10", pkgname:"libpam-doc", pkgver:"1.0.1-4ubuntu5.6")) flag++;
if (ubuntu_check(osver:"8.10", pkgname:"libpam-modules", pkgver:"1.0.1-4ubuntu5.6")) flag++;
if (ubuntu_check(osver:"8.10", pkgname:"libpam-runtime", pkgver:"1.0.1-4ubuntu5.6")) flag++;
if (ubuntu_check(osver:"8.10", pkgname:"libpam0g", pkgver:"1.0.1-4ubuntu5.6")) flag++;
if (ubuntu_check(osver:"8.10", pkgname:"libpam0g-dev", pkgver:"1.0.1-4ubuntu5.6")) flag++;
if (ubuntu_check(osver:"9.04", pkgname:"libpam-cracklib", pkgver:"1.0.1-9ubuntu1.1")) flag++;
if (ubuntu_check(osver:"9.04", pkgname:"libpam-doc", pkgver:"1.0.1-9ubuntu1.1")) flag++;
if (ubuntu_check(osver:"9.04", pkgname:"libpam-modules", pkgver:"1.0.1-9ubuntu1.1")) flag++;
if (ubuntu_check(osver:"9.04", pkgname:"libpam-runtime", pkgver:"1.0.1-9ubuntu1.1")) flag++;
if (ubuntu_check(osver:"9.04", pkgname:"libpam0g", pkgver:"1.0.1-9ubuntu1.1")) flag++;
if (ubuntu_check(osver:"9.04", pkgname:"libpam0g-dev", pkgver:"1.0.1-9ubuntu1.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    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, "libpam-cracklib / libpam-doc / libpam-modules / libpam-runtime / etc");
}