Ubuntu 5.04 / 5.10 / 6.06 LTS : openssl vulnerability (USN-353-2)

2007-11-10T00:00:00
ID UBUNTU_USN-353-2.NASL
Type nessus
Reporter Tenable
Modified 2019-01-02T00:00:00

Description

USN-353-1 fixed several vulnerabilities in OpenSSL. However, Mark J Cox noticed that the applied patch for CVE-2006-2940 was flawed. This update corrects that patch.

For reference, this is the relevant part of the original advisory :

Certain types of public key could take disproportionate amounts of time to process. The library now limits the maximum key exponent size to avoid Denial of Service attacks. (CVE-2006-2940).

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-353-2. 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(27934);
  script_version("1.14");
  script_cvs_date("Date: 2019/01/02 16:37:56");

  script_cve_id("CVE-2006-2940");
  script_bugtraq_id(20247);
  script_xref(name:"USN", value:"353-2");

  script_name(english:"Ubuntu 5.04 / 5.10 / 6.06 LTS : openssl vulnerability (USN-353-2)");
  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:
"USN-353-1 fixed several vulnerabilities in OpenSSL. However, Mark J
Cox noticed that the applied patch for CVE-2006-2940 was flawed. This
update corrects that patch.

For reference, this is the relevant part of the original advisory :

Certain types of public key could take disproportionate amounts of
time to process. The library now limits the maximum key exponent size
to avoid Denial of Service attacks. (CVE-2006-2940).

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/353-2/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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(399);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl0.9.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl0.9.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libssl0.9.8-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:openssl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:5.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:5.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:6.06:-:lts");

  script_set_attribute(attribute:"patch_publication_date", value:"2006/10/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2007/11/10");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2007-2019 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:"^(5\.04|5\.10|6\.06)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 5.04 / 5.10 / 6.06", "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:"5.04", pkgname:"libssl-dev", pkgver:"0.9.7e-3ubuntu0.6")) flag++;
if (ubuntu_check(osver:"5.04", pkgname:"libssl0.9.7", pkgver:"0.9.7e-3ubuntu0.6")) flag++;
if (ubuntu_check(osver:"5.04", pkgname:"openssl", pkgver:"0.9.7e-3ubuntu0.6")) flag++;
if (ubuntu_check(osver:"5.10", pkgname:"libssl-dev", pkgver:"0.9.7g-1ubuntu1.5")) flag++;
if (ubuntu_check(osver:"5.10", pkgname:"libssl0.9.7", pkgver:"0.9.7g-1ubuntu1.5")) flag++;
if (ubuntu_check(osver:"5.10", pkgname:"openssl", pkgver:"0.9.7g-1ubuntu1.5")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libssl-dev", pkgver:"0.9.8a-7ubuntu0.3")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libssl0.9.8", pkgver:"0.9.8a-7ubuntu0.3")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"libssl0.9.8-dbg", pkgver:"0.9.8a-7ubuntu0.3")) flag++;
if (ubuntu_check(osver:"6.06", pkgname:"openssl", pkgver:"0.9.8a-7ubuntu0.3")) 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, "libssl-dev / libssl0.9.7 / libssl0.9.8 / libssl0.9.8-dbg / openssl");
}