Ubuntu 16.04 LTS / 18.04 LTS / 19.04 / 19.10 : ruby2.3, ruby2.5 vulnerabilities (USN-4201-1)

2019-11-27T00:00:00
ID UBUNTU_USN-4201-1.NASL
Type nessus
Reporter Ubuntu Security Notice (C) 2019 Canonical, Inc. / NASL script (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-01-02T00:00:00

Description

It was discovered that Ruby incorrectly handled certain files. An attacker could possibly use this issue to pass path matching what can lead to an unauthorized access. (CVE-2019-15845)

It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could use this issue to cause a denial of service. (CVE-2019-16201)

It was discovered that Ruby incorrectly handled certain HTTP headers. An attacker could possibly use this issue to execute arbitrary code. (CVE-2019-16254)

It was discovered that Ruby incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code. (CVE-2019-16255).

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-4201-1. 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(131392);
  script_version("1.4");
  script_cvs_date("Date: 2019/12/12");

  script_cve_id("CVE-2019-15845", "CVE-2019-16201", "CVE-2019-16254", "CVE-2019-16255");
  script_xref(name:"USN", value:"4201-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 19.04 / 19.10 : ruby2.3, ruby2.5 vulnerabilities (USN-4201-1)");
  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:
"It was discovered that Ruby incorrectly handled certain files. An
attacker could possibly use this issue to pass path matching what can
lead to an unauthorized access. (CVE-2019-15845)

It was discovered that Ruby incorrectly handled certain regular
expressions. An attacker could use this issue to cause a denial of
service. (CVE-2019-16201)

It was discovered that Ruby incorrectly handled certain HTTP headers.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2019-16254)

It was discovered that Ruby incorrectly handled certain inputs. An
attacker could possibly use this issue to execute arbitrary code.
(CVE-2019-16255).

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/4201-1/"
  );
  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_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-16255");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libruby2.3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libruby2.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby2.3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:ruby2.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:19.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:19.10");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/11/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/11/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2019 Canonical, Inc. / NASL script (C) 2019 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 (! preg(pattern:"^(16\.04|18\.04|19\.04|19\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 16.04 / 18.04 / 19.04 / 19.10", "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:"16.04", pkgname:"libruby2.3", pkgver:"2.3.1-2~ubuntu16.04.14")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"ruby2.3", pkgver:"2.3.1-2~ubuntu16.04.14")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"libruby2.5", pkgver:"2.5.1-1ubuntu1.6")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"ruby2.5", pkgver:"2.5.1-1ubuntu1.6")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"libruby2.5", pkgver:"2.5.5-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"ruby2.5", pkgver:"2.5.5-1ubuntu1.1")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"libruby2.5", pkgver:"2.5.5-4ubuntu2.1")) flag++;
if (ubuntu_check(osver:"19.10", pkgname:"ruby2.5", pkgver:"2.5.5-4ubuntu2.1")) 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, "libruby2.3 / libruby2.5 / ruby2.3 / ruby2.5");
}