Ubuntu 6.06 LTS / 6.10 / 7.04 / 7.10 : openssh vulnerability (USN-566-1)

2008-01-10T00:00:00
ID UBUNTU_USN-566-1.NASL
Type nessus
Reporter Tenable
Modified 2018-11-28T00:00:00

Description

Jan Pechanec discovered that ssh would forward trusted X11 cookies when untrusted cookie generation failed. This could lead to unintended privileges being forwarded to a remote host.

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-566-1. 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(29922);
  script_version("1.18");
  script_cvs_date("Date: 2018/11/28 11:42:05");

  script_cve_id("CVE-2007-4752");
  script_bugtraq_id(25628);
  script_xref(name:"USN", value:"566-1");

  script_name(english:"Ubuntu 6.06 LTS / 6.10 / 7.04 / 7.10 : openssh vulnerability (USN-566-1)");
  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:
"Jan Pechanec discovered that ssh would forward trusted X11 cookies
when untrusted cookie generation failed. This could lead to unintended
privileges being forwarded to a remote host.

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/566-1/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(20);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssh-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssh-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ssh");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ssh-askpass-gnome");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ssh-krb5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:6.06:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:6.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:7.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:7.10");

  script_set_attribute(attribute:"patch_publication_date", value:"2008/01/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2008/01/10");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2008-2018 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:"^(6\.06|6\.10|7\.04|7\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 6.06 / 6.10 / 7.04 / 7.10", "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:"6.06", pkgname:"openssh-client", pkgver:"1:4.2p1-7ubuntu3.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"openssh-server", pkgver:"4.2p1-7ubuntu3.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"ssh", pkgver:"4.2p1-7ubuntu3.2")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"ssh-askpass-gnome", pkgver:"4.2p1-7ubuntu3.2")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"openssh-client", pkgver:"1:4.3p2-5ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"openssh-server", pkgver:"4.3p2-5ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"ssh", pkgver:"4.3p2-5ubuntu1.1")) flag++;
if (ubuntu_check(osver:"6.10", pkgname:"ssh-askpass-gnome", pkgver:"4.3p2-5ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"openssh-client", pkgver:"1:4.3p2-8ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"openssh-server", pkgver:"4.3p2-8ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"ssh", pkgver:"4.3p2-8ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"ssh-askpass-gnome", pkgver:"4.3p2-8ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.04", pkgname:"ssh-krb5", pkgver:"4.3p2-8ubuntu1.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"openssh-client", pkgver:"1:4.6p1-5ubuntu0.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"openssh-server", pkgver:"4.6p1-5ubuntu0.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"ssh", pkgver:"4.6p1-5ubuntu0.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"ssh-askpass-gnome", pkgver:"4.6p1-5ubuntu0.1")) flag++;
if (ubuntu_check(osver:"7.10", pkgname:"ssh-krb5", pkgver:"4.6p1-5ubuntu0.1")) 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, "openssh-client / openssh-server / ssh / ssh-askpass-gnome / etc");
}